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Stirling Engine

I have a 4.3l v6 that came out of a s-10 pickup.  I was wondering if i could make it run on the stirling cycle? It is a 90 degree v6 so it should work, This is the only site i could think of to post this question on. I was thinking i would isolate the waterjackets to the right and left bank of cylinders then heat one side and cool the other. I am good with engines and am skilled in the garage. I'm just tinkering. Maybe run a generator with it if it runs. I have a welder, plasma cutter, ect and can use them. Just kinda throwin it out there...

Topic by qparker    |  last reply

stirling engine

This is just my burning question for anyone who has mad skills in engineering. how do I build a small stirling engine generator for home use to run off a non-combustion heat source ie solar panels?

Topic by djsc    |  last reply

V6 Stirling Engine

I have a 4.3l v6 that came out of a s-10 pickup.  I was wondering if i could make it run on the stirling cycle? It is a 90 degree v6 so it should work, This is the only site i could think of to post this question on. I was thinking i would isolate the water jackets to the right and left bank of cylinders then heat one side and cool the other. I am good with engines and am skilled in the garage. I'm just tinkering. Maybe run a generator with it if it runs. I have a welder, plasma cutter, ect and can use them. Just kinda throwin it out there...

Question by qparker    |  last reply

Why wont my Stirling Engine Work!?

Ok... the thing will expand, but it will not contract. why is it not contracting??

Question by Acepilot42    |  last reply

dimensions for displacer on a Stirling engine? Answered

I want to make a low temperature Stirling engine. I was looking at some different designs for them and none really have a set dimension for the displacer. All the ones I see must just be guesswork. I  have a glass tube that I was going to use for the power cylinder about 16mm diameter I will build it like this. I have no idea what size the displacer cylinder and displacer will need to be for it to be effective. can anyone guess for me? I also need to know how much the piston should move for it to be effective. Thanks, David.

Question by David97    |  last reply

Drinks can Stirling engines (UK & EU only)

These are simple coke can Stirling engines that run on one or two candles. Made from recycled coke cans, tuna cans and bottle lids. They are of a simple gravity driven design that using fishing line to connect the displacer. Each on is made by me and slightly different, so the pictures are guidelines only. Please not these are just models will not power anything useful (as far as I'm aware!).  They are £8.99+ £1.98 shipping. For more details, see my site here. (video shows slightly older version, these run the same though)

Topic by scraptopower    |  last reply

Hot bulb stirling engine dimentions

I am going to make a hot bulb sterling engine and am unsure about the dimensions of any of it. If anyone can help, please do.

Topic by DELETED_robobloke  

how does this work?

Recently I stumbled across this video so, has anyone built one of these things? I am thinking about building one of these. any help would be greatly apreciated

Topic by mynameisjonas    |  last reply



Question by bustedknuckles    |  last reply

Solar-driven Stirling engines for electricity generation

The "Picture of the Day" in today's New Scientist shows a solar power generation test using Stirling engines as the generators.

Topic by kelseymh    |  last reply

Stirling engine displacer design? Answered

I am designing a gamma Stirling engine (this type) and I am unsure how long the piston should be and how long its stroke length should be the specs for the cylinder and piston pipes are below. The pipe for the cylinder is stainless steel. Wall thickness: 1.56mm Outer diameter: 31.7mm Inner diameter: 28.6 Length: 200mm (can be cut smaller) (Stainless steel cap will be welded to one end, the other end where the shaft comes out will be plugged with this nylon/graphite stuff) The pipe for the displacer piston is aluminium pipe.  Wall thickness: 1mm Outer diameter: 27.88mm Inner diameter: 25.88mm Length: ? (Two aluminium plugs will be used to seal its ends) How long should the piston, cylinder and stroke lengths be based on the specs?

Question by The MadScientist    |  last reply

Is it possible to create a magnetic difference engine using stirling theory? Instead of hot and cold can strong and weak Answered

I just got finished building a stirling engine using plans from instructables author: thecheatscalc published dec 17 2007. The stirling engine is a heat difference engine. Is it possible to create a magnetic difference engine using stirling theory? I was thinking instead of hot and cold north and south or strong and weak..?

Question by bazalaz    |  last reply

Please evaluate this design. Answered

I'm trying to develop a new type of engine, but before deciding to make a prototype, which could take a long time, I would like you –who know more than I about motors– do tell me if my engine design has a serious impediment.

Question by rimar2000    |  last reply

Can you check this design? Answered

On Aug 26 I posted an ask about a design of a new type of motor.  I received some good advices. Redesigned 02/10/12 The previous design had a major flaw, that went unnoticed at first but it became clear as I went into the construction of the prototype: the thermal barrier would be totally useless, because the steam produced in the boiler necessarily have to go through liquid water to make its way into the compression chamber. This would have two disabling consequences: 1) the vapor would cool quickly, 2) the water would heat up quickly, too. Since any heat engine operation is based on temperature differences, this failure is vital. The new design does not have that problem. The water falls directly into the hot boiler, a small amount at a time, with the piston in the upper dead point, or below (note that my drawing is reversed with respect to what would be a conventional combustion engine). The water is kept cold by being stored in a separate reservoir, attached to the motor body only by the inlet and outlet pipes. Water injection is performed by momentarily opening a valve at the appropriate time. Since the interior of the water reservoir accumulates pressure as the engine works, this pressure would be in principle the responsible to force the output water through the tap. If that's not enough, I could add a little manual compression pump to initially load the reservoir with compressed air. So once the Primus heaters worked, which were extremely useful for decades. The exact moment, quantity and duration of water injection should be adjustable during operation of the engine, to find the optimum point for these parameters. These mechanisms have not thought of yet, but they can not be too complicated. As regards the boiler, it is likely that one heated surface be insufficient to rapidly vaporize the water, since in these conditions it usually adopt a globular shape that greatly retards heat transfer (Leidenfrost effect, http://resnickscity.wordpress .com/2011/01/page/3 /,, I think that could be solved relatively easily by a double bottom to the boiler, in order to "force" the water into laminar contact with the hot surface. If this is insufficient, it would still be possible to inject the water by pressure between two heated surfaces. I have to also investigate the possibility of to make "super hydrophilic" the surface of the boiler. Regarding the compression chamber, this design makes it much longer, thus establishing a better differentiation between the bottom hot and top cold. But the main novelty is that the displacer stops acting on a small amount of water to turn acting, as in the Stirling engine, on the entire volume of the steam in the compression chamber. By forcing the steam to move towards the cold zone it produces its condensation, thereby changing the pressure by decompression, and so completing the cycle of the engine. The condensation water adheres to the cold walls of the chamber, then it slides down by gravity, and is intercepted midway by the retaining ring, which leads it back to the water reservoir through a single action valve, spring driven. I guess that to pass the water to the reservoir will be enough the vapor pressure that occurs in each cycle. The accompanying drawings are quite precarious, but only pretend to give a general idea of the design. Please ask me if you want more details ------------------------------------------------------------------- Nuevo diseño 02/10/12 El diseño anterior tenía una falla importante, que me pasó desapercibida al principio pero se hizo evidente a medida que avanzaba en la construcción del prototipo: la barrera térmica iba a resultar totalmente inútil, dado que el vapor producido dentro de la calderita tendría que atravesar forzosamente el agua líquida para abrirse camino hacia la cámara de compresión. Esto tendría dos consecuencias inhabilitantes: 1) el vapor se enfriaría rápidamente; 2) el agua se calentaría también rápidamente. Dado que el funcionamiento de cualquier máquina térmica se basa en las diferencias de temperatura, esta falla resultaba vital. El nuevo diseño no tiene ese problema. El agua cae directamente dentro de la caldera caliente, una pequeña cantidad por vez, estando el pistón en el punto muerto superior, o sea abajo (ojo, que mi dibujo está al revés respecto de lo que sería el de un motor a explosión convencional). El agua se mantiene fría, por estar guardada en un reservorio separado del motor, unido a él solo por los caños de entrada y salida. La inyección de agua se realiza mediante la apertura momentánea de un grifo en el momento oportuno. Dado que el interior del reservorio de agua acumula presión al funcionar el motor, esta presión sería en principio la encargada de impulsar la salida del agua a través del grifo. Si esto no fuera suficiente, habría que agregar una pequeña bomba manual de compresión para cargar inicialmente de aire comprimido el reservorio. Así funcionaban antiguamente los calentadores Primus, que fueron sumamente útiles durante décadas. El momento exacto, la cantidad y la duración de la inyección de agua deben ser regulables durante el funcionamiento del motor, para hallar el punto óptimo de esos parámetros. Esos mecanismos no lo he pensado todavía, pero no pueden ser demasiado complicados. Respecto de la caldera, es muy probable que una sola superficie recalentada sea insuficiente para vaporizar rápidamente el agua, dado que en esas condiciones esta suele adoptar una forma globular que retarda mucho la transferencia de calor (efecto Leidenfrost,,, Creo que eso podría solucionarse con relativa facilidad haciendo un doble fondo a la caldera, de manera de "obligar" al agua a establecer contacto laminar con la superficie caliente. Si esto fuera insuficiente, siempre quedaría la posibilidad de inyectar el agua a presión entre ambas superficies recalentadas. Tengo que investigar también la posibilidad de hacer "súper hidrófila" la superficie de la caldera. Respecto a la cámara de compresión, este diseño la hace mucho más larga, estableciendo así una mejor diferenciación entre la zona inferior, caliente, y la superior, fría. Pero la principal novedad es que el desplazador deja de actuar sobre una pequeña cantidad de agua para pasar a hacerlo, como en el motor de Stirling, sobre el volumen completo del vapor contenido en la cámara de compresión. Al obligar a este a desplazarse hacia la zona fría produce su condensación, cambiando así la presión por descompresión, y completando así el ciclo del motor. El agua de condensación se adhiere a las paredes frías de la cámara, resbala luego por gravedad hacia abajo, y es interceptada a mitad de camino por el anillo de retención, que la conduce nuevamente hacia el reservorio de agua a través de una válvula de simple acción, a resorte. Supongo que para hacer pasar el agua al reservorio será suficiente con la presión de vapor que se produce en cada ciclo. Los dibujos adjuntos son algo precarios, pero no pretenden más que dar una idea general del diseño. Por favor, pregúntenme si quieren más detalles.

Question by rimar2000    |  last reply

Stirling engine merry go round from meccano

This is a master piece :D Not mine unfortunately, but the builder has created a model merry go round that is powered by a twin cylinder Stirling engine. Very well built.

Topic by scraptopower  

Sandia, Stirling Energy Systems set new world record for solar-to-grid conversion efficiency

31.25 percent efficiency rate topples 1984 recordALBUQUERQUE, N.M. --On a perfect New Mexico winter day -- with the sky almost 10 percent brighter than usual -- Sandia National Laboratories and Stirling Energy Systems (SES) set a new solar-to-grid system conversion efficiency record by achieving a 31.25 percent net efficiency rate. The old 1984 record of 29.4 percent was toppled Jan. 31 on SES's "Serial #3" solar dish Stirling system at Sandia's National Solar Thermal Test Facility.The conversion efficiency is calculated by measuring the net energy delivered to the grid and dividing it by the solar energy hitting the dish mirrors. Auxiliary loads, such as water pumps, computers and tracking motors, are accounted for in the net power measurement."Gaining two whole points of conversion efficiency in this type of system is phenomenal," says Bruce Osborn, SES president and CEO. "This is a significant advancement that takes our dish engine systems well beyond the capacities of any other solar dish collectors and one step closer to commercializing an affordable system."Serial #3 was erected in May 2005 as part of a prototype six-dish model power plant at the Solar Thermal Test Facility that produces up to 150 kilowatts (kW) of grid-ready electrical power during the day. Each dish unit consists of 82 mirrors formed in a dish shape to focus the light to an intense beam.The solar dish generates electricity by focusing the sun's rays onto a receiver, which transmits the heat energy to a Stirling engine. The engine is a sealed system filled with hydrogen. As the gas heats and cools, its pressure rises and falls. The change in pressure drives the pistons inside the engine, producing mechanical power, which in turn drives a generator and makes electricity.More here:

Topic by ewilhelm    |  last reply

What can you tell me about Stirling engines?

I'm interested in using a Stirling engine in a solar energy project. From reading around and doing some numbers it looks like I'll need around 1.5 kilowatts, and something in the vicinity of 30% efficiency or upwards would be nice, though I realise this may be overly optimistic. So, what's available, how much will it cost, what temperature differential is ideal, how big and heavy are these things, etc. Any info I get would enormously helpful. Cheers, Daniel.

Topic by SolarFlower_org    |  last reply

Solar Heat in Cold Climates

Cool Energy is making a solar power and heating system that works in cold climates. Hooray!  It makes use of a highly efficient Stirling Engine.SolarHeart

Topic by whiteoakart  

Is it possible to use hot glue as an adhesive for LTD stirling engines? Answered

Is it possible to use hot glue as an adhesive for building low temperatue difference (LTD) stirling engines? I was wondering because I do not want to buy epoxy or other expensive glue. Will I be able to use hot glue, or will the glue melt from the heat of a cup of boiling water? 

Question by Zippo1234    |  last reply

Suggest a nice mechanical/robotics project.I am interesting in things like pipe climbing robot and stirling engines.

I need to do a project as a part of my curriculum .I am currently interested in things like pipe climbing robots and a fan which runs using laptop heat.( uses stirling engine ) .By the way the time line for proj is 1 year, and it needs to use low cost materials.

Question by zakirs    |  last reply

My First How to? Video, Homemade rotating marble stirling engine

In this current video, I will explain you how to create a simple rotating type marble stirling engine easily using readily available materials. used:1. Testtube- Displacer cylinder2. Marbles - Displacer piston3. Glass syringe- Power piston4. Propeller- FLywheel5. 3V electric motor- Bearing supportPlease provide your feedback on the same. In this channel I have planned to post all of my stirling engine make with step by step instructions.Thank youRegardsGaneshView Video hereContent of the Video: ))Result demo ))Short theory behind working of stirling engines (Animated) ))Live demonstration ))Long run engine video

Topic by ganuganu    |  last reply

Idea for a non-ideal Carnot cycle based engine.

Initial Stirling engine conceptFor some time I was contemplating an idea for a Stirling engine that would work quite differently than the other designs that I came across. Whole internal volume of an engine may be viewed as a closed-loop pipe, trombone-like slide mechanism allows this pipe to change its length. Electrical fan replaces displacer and pumps working fluid throughout the engine constantly and in one direction. Some portion of the pipe is replaced with branching structure that consist of two heat exchangers (hot and cold) and regenerator. On both ends of this structure special valves are located that connect one of the structure’s parts to the main pipe, so that whole engine forms one closed-loop. While this happens, both of the unused parts are completely bypassed.This design should have many advantages. Working gas is in constant motion and little energy is wasted on accelerating it. Gas may pass many times through heat exchangers, allowing for much better approximation of isothermal processes. Disconnecting unused heat exchangers from the rest of the engine should minimize volume of dead spaces.There are some drawbacks to. Slide mechanism allows only very small changes of total volume (compression ratio is low), and that limits engine’s ability to operate with higher temperature differences. Piston, which is part of the slide mechanism, and especially valves, are heavy and this makes them unsuited for high speed operation, making the whole engine bulky. I also except that an area of all surfaces that are sliding against each other and produce friction would be higher than in traditional Stirlings.Problems with Stirling cycleIdeal Stirling cycle (Fig. 4) consist of two isothermal processes (constant temperature) during which work is performed, and two isochoric processes (constant volume, no work performed). Isochoric processes function is only to change temperature of the working gas, and this takes a lot of energy to do so (especially if gas with high heat capacity is used). Regular Stirling engines try to minimize this inefficiency with regenerator. But when I tried to analyze this process mathematically, I noticed that even regenerator with very high heat capacity cannot store more than half the energy needed to perform next isochoric process (see lower left part of the spreadsheets for more details).Fig. 5 represents heat pump (or refrigerator) working in a modified Stirling cycle. Isochoric processes represent transfers of heat to and from the regenerator. Rest of the temperature change is performed by polytropic processes, during which heat flows to or from the heat exchangers and also work is performed. I chose to represent heat pump, instead of a engine because engine working with this modified cycle wold require isochoric processes to be performed midstroke (or transfers of heat to regenerator would have to be performed during polytropic processes, when working gas changes its temperature also due to work being performed).Note that I am using word polytropic to indicate processes where gas changes its energy both due to heat transfers and work performed. When special cases of polytropic process are mentioned (isothermal, adiabatic, isochoric) I use their specific names.Solving those problems with Carnot cycleLegendary Carnot cycle consist of two isothermal processes (just like Stirling cycle), but changes of temperature are accomplished by the adiabatic processes (no heat transfers with the surroundings), instead of isochoric ones. This has huge advantage, because when energy is added to the working gas during adiabatic compression, all of it can be later recovered during adiabatic expansion.Design I previously mentioned can easily be adapted to work as a Carnot engine. Only change that is necessary, is replacement of regenerator with the empty pipe (ADIABATIC PIPE in Fig. 2). When valves connect this empty pipe to the rest of the engine, there is no heat transfer between working fluid and thermal reservoirs. Any changes of engine volume modify temperature and pressure in a approximately adiabatic fashion. To model what happens with the engine I used slightly modified Carnot cycle (Fig.3). Just before adiabatic process end, short polytropic process begins. It is done so that loses associated with valves connecting both adiabatic pipe and heat exchanger to the main part of the engine for a short period of time can be better simulated. Heat pump working in this cycle is shown in Fig. 6.Design detailsEngine uses special valves, which external shape resemble truncated cone. Smaller base of this cone faces main part of the engine, larger one heat exchangers. Inside there is a pipe, with one opening right in the center of smaller base. The other opening is located off-center on the larger base, so it can connect to the one of the heat exchangers or adiabatic pipe (which are situated just like chambers of a revolver’s cylinder in respect to each other). As this engine engine will most likely operate under low RPMs, flywheel will have to be connected through a transmission with very high gear ratio. The flywheel will have to be quite bulky as well. This poses another challenge, as the pressure inside engine’s tubing will be higher than atmospheric, and at least space around the other side of the “piston” will have to be pressurized as well. If only the immediate surroundings will be pressurized, and gears, flywheel, electric motor/generator will be outside of the container, then very inefficient seal will have to be employed. If everything will be located inside the pressurized container, then fast moving parts will be working against dense gas. Pressure in this area ideally should have such a value, so that on every piston stroke energy is both added to the flywheel and extracted from it as to make energy storage requirements more manageable. This requirements may also be further reduced by employing some other energy storage form. And of course exchange of heat between main part of the engine and this pressurized section must be taken into consideration.Then, there is problem of heat exchangers. They can be either large diameter pipes with fins, or smaller diameter ones that are densely packed (this seems to be must popular configuration in Stirling engines). As heat transfer with the outside of the engine takes around half of the piston stroke, it might be a good idea to employ two pumps of heat transfer fluid per each of the two heat exhangers. One would work constantly to transfer heat from some large heat reservoir, the other would transfer heat to the working fluid only when it is necessary. Some another heat exchanger would have to be placed between those two circuits.And there is also a question of the piston. Basic trombone-like version could be replaced by the something similar to the design drawn in Fig. 7, where two parallel tubes, connected by U-shaped piston, are replaced by the coaxial pipes with volute on the outer section that allows connection another parallel pipe. Piston itself has then small tubular part attached which allows working fluid to pass from outer section to the inner section. This design has only one high pressure seal, is possibly lighter, but fan that pumps working fluid will probably need to be more powerful. Problem of sideways motion of the piston must also be analyzed, and it can be either resolved with piston skirts or the crosshead. Interesting aspect of this problem is that while most frictional forces in the engine are mostly independent of the engine speed, forces associated with this sideways motion of the piston increase with engine rotational speed.Another possible improvement would be making adiabatic pipe shorter than the heat exchangers, which would reduce volume of dead spaces.Engine parametersIn case of a engine that uses helium as a working fluid, has minimum volume of 46.7 liters, maximum volume of 70 liters, operates at temperatures of -5°C and 37°C with the speed of 15 RPM you can expect that it will produce 1138W of power at 8.13% efficiency.In the case of heat pump that operates at the same parameters you can expect that it will require 2300W of power and achieve COP 4.95You can find calculations, diagrams and the detailed descriptions inside (it is unfortunate that Instructables do not support uploading .zip files and other file formats any more, and I have to use another website just to upload few spreadsheets).Possible applicationsI started thinking about this concept when considering applications of thermal energy storage. In more northern latitudes largest factor in domestic energy consumption is heating. So, at least in my opinion, any movement toward replacing fossil fuels with renewables should focus on this largest contributing factor. And this actually is quite fine because storing 1 kWh in a tank filled with water, rocks/concrete or simply in the ground is much cheaper than storing it inside lithium-ion batteries. And general idea behind this low temperature engine, was that some part of this large amount of energy stored to be later used to heat buildings, could be converted into electricity.It should also be able to work in reverse as a heat pump or refrigerator.

Topic by rarinn  

We need plans for a small pellet fired stove for use with a lab model Stirling engine.

We would like to build a model Stirling engine coupled to a pellet fired stove as part of a project for our students.Plans for Stirling engine are available with us.We shall appreciate if some one can provide us plans for a small pellet fired stove.The unit will be used for demonstration purpose in our college.

Question by docraja    |  last reply

Does anyone have ideas on a rocket mass heater / Stirling engine hybrid?/?

In the beginning stages of my research on different green technologies. these two would seem to mesh well with the correct engineering , but i haven't run across  any examples of it. Your thoughts? Maybe something new may come of this?...

Question by ericb985    |  last reply

Engineering Class Suggestions

I'm part of an Engineering Club at my school and we're looking for future projects that just explore some ideas of Engineering in general. We would like to come up with our own ideas at some point, but for now, a lot of us are inexperienced, so I thought I could come here and find some stuff. So far, we have decided to build a bunch of Stirling Engines and use them for miscellaneous things, but after that, we have no other ideas. Could you guys come up with some ideas (possibly your own or ones that you have done), that are similar to this idea of teaching the basics of making things and stuff like that? Links would be helpful. Guidelines: Because we do this at school, there are certain rules that prevent us from bringing large knives and laser pointers on campus. Power tools and exacto knives are OK, though (IKR?). Also, because we are students, we have to scavenge around for materials, so unless it's less than ~30$, we might not be able to do that either.

Topic by jaxter184    |  last reply

What would happen if we combined current pellet stove technology with a Stirling engine through an outside wall?

In Theory, A Stirling engine works on a difference of temperature. For many rural homes there is great expense in developing and sustaining power lines. These homes are already heating from an inside source, and create a difference of temperature, depending on the proximity to the firebox of at least 2X. If developed as a mobile stove, you could glean a mobile power source only dependant on supplying a small chamber with fuel. Such an engine would be able to sustain on green fuels as well if heating an area wasn't a factor. It might even pay for itself in an AC situation where the thermal difference is reversed. Why haven't we put a power source in every appartment using electric fuel?

Question by willcchase    |  last reply

Nice Stirling Engine. Does anyone no how to make one? Answered

i love to create and make things like this that are kinda geeky but really amazingly coooool. i tried to make one myself freelance but it didnt work. i would love to make an almost all metal one. my favorite one is this one on youtube. its called KS90 Stirling engine running on hand heat. the creator is stirlingeezer. he has multiple videos of this device. i would accept any proven designs/concepts that are close to this low te4mperature difference device. THX

Question by FREETHINKER!    |  last reply

Stirling AC, someone tell me why it wouldnt work.

Take a split type airconitioner unit (with heat exchanger / motor etc outside the house) remember that heat pumps have COPs >1 so they remove more energy than you put in. Now take a reasonably efficient stirling engine and bolt it onto the external heat exchanger so there is a gradient between the hot heat exchanger and the warm air outside and use it to pump the refrigerant around the system. Surely a heat-pump stirling engine combo can be made efficiently enough to effectively run itself once it has been started up, maybe with a few watts of electric to run some fans.

Topic by pyper    |  last reply

What health and safety laws/legislations would I need to cover if i was making a sterling engine?

I need to consider such things as hot surfaces,small parts, moving parts etc any help is much appreciated...thanks

Question by dubpunkdub    |  last reply

Piston heads- simple easy designs/ light materials?

I'm looking for an apropiate design soloution for making my own stirling engine piston heads. I plan on using O'rings for the seal and joined them to piston arms which in turn are connected to a crankshaft...please advice Once I'v built I'll upload pictures/tutorial (over the next few month)

Question by dubpunkdub    |  last reply

"New " old material for experimentation.

This video is about Nitinol memory metal engines that are basically Stirling heat engines and work on a very low temperature difference. I first say this material while watching a video on the founder of 'The Venus Project'. He had small spring that he would stretch out of shape and the heat it - it would come back to its original form and shape. I thought it was neat but didn't see the potential of the material. This video is from a 1970 CNN broadcast  - when CNN was news instead of a propaganda machine. The material is available on the web somewhere as others have purchased it since I showed them the video. At this point in time I am more of an information messenger and unable to partake in experimentation. So have at it guys and gals. God Bless

Topic by strmrnnr  

How can I weld/ fuse aluminium without a welder? Answered

I am trying to make a Stirling engine, for the displacer piston I need to weld an aluminium tube to some aluminium plate and possibly bar but I don't have any welding equipment, so any suggestions?

Question by The MadScientist    |  last reply

Has anyone made a solar heat powered Fluidyne stirling engine air pump?

So, I will start with what I have in mind.  (Might be total rubbish because I don't fully understand).  You have a solar collector box, not more than 1 meter square.  painted black 1 to 2 cm deep,   and probably with glazing over top. The box itself is metal fully closed up and the back is insulated.  From the box through the insulation there are some metal tubes that go to another box at back for the cooling chamber. Tubes are constricted so the air sprays through to the cooling box and it goes into steel wool as it expands. On the reverse stroke, it does not go so much through the steel wool because the nozel constriction is  on that side not the hot side.   Power is taken away from a liquid piston somewhere attached to both chambers  or a diaphragm at the back. (It can be water cooled). I want the strokes to be long and slow. Can it work?   Temp difference will only be around 40 degrees C and the pumped air ( 2 valves  in chamber off of liquid piston) only needs to go to 2 psi. )    I have been in contact with a guy in Germany who made Sterlings that worked with sun heat.    But he didn't use Fluidyne (also called liquid piston stirling) and he did not pump air.          My specs are extremely low, I only need 60 litres per hour of air at 1 or 2 PSI.  It would be very cool to make it from such basic materials.                 Thanks Brian

Topic by gaiatechnician    |  last reply

DIY Edge-Lit Display, Lynne Bruning, Digital Holga Lens

DIY Edge-Lit Display Featured Author: Lynne Bruning Digital Holga Lens Filtered Pet Water Bowl A Simple Steam Engine USB Dongle Waveguide Unique String Art Paracord Earbud Sleave Father's Day Make a Cross from a Coin Wind Turbine from Scrap Wireless Hexapod Robot USB Tester Arduino 3-Axis CNC Wiring Building a Better Stirling Engine

Topic by randofo  

There Should be a Solar contest

There should be a solar energy contest, I'm sure there are lots of awesome ideas out there. I'm thinking solar powered coffee machine, kite wind generator, ..... Maybe categories like small gadgets, garden, home power, cooking? Prizes like a 100w photovoltaic panel, solar cell phone chargers, Stirling engine for the coffee cup.Lets put our heads together on this.

Topic by robbtoberfest    |  last reply

No printed instructions for a kit

Would not having printed instructions put you off buying a kit ? I put together a coke can Stirling engine kit, but I don't know whether to print instructuctions or have them on the website. Printing them myself would probably increase the cost by a fair bit as my cheap inkjet printer really eats expensive ink (must by new printer - but they are evil).  The assembly isn't really complicated. Your opinions please!

Topic by scraptopower    |  last reply

What is a good science fair project? Answered

In school we have science fair and i need to come up with a project. I like mechanical things not growing plants or anything like that. one year i did centrifugal force then another on the otto cycle but never got in :(...i have to use the scientific method, i was thinking something along the lines of how different nitro rc fuel percentages effect nitro engine preformance but thats kinda obvious and lame. i was also thinking of making a stirling engine but dont know how to fit the scientific method into it plus i never got any of my engines to work :( Just let me know if you guys have any good projects i can do? like i said im mechanical but i dont really have any tools to make stuff.

Question by Acepilot42    |  last reply

PDF files often corrupted

Many times the PDF files that come from instructables will not open. I kept some of these to try and repair with various PDF fixer programs. They all fail, with one program reporting that there is an error reading the “XREF Table” of these files. Some of the files that fail are: A-Simple-Steam-Engine-Anyone-Can-Build.pdf Build-a-Better-Stirling-Engine.pdf Rechargeable-flashlight-without-batteries.pdf Wood-stove-made-from-scrap.pdf I don’t need a response... just thought you may want to know. ~Bob~

Topic by ShutterBugger    |  last reply

Gameboy Volt / Speed ?

Hi, I am working on a little project with my olde Gameboy Color ! I am taking it out of its case, and building a wooden / bronze one in SteamPunk Style. Now to get even Nerdier i am considering to build a "Stirling engine" and power the little machine with a Dynamo attached to it! However this might turn out, i would like to know if the dynamo generates more than 3V if that would speed the Gameboy up, or simply fry it? I will add a Good Resistor to prevent that btw :p

Topic by Schoening    |  last reply

Looking for a 400-600 C electric burner / heating element?

Im working on building a stirling engine which is powered by heat. The bottom cylinders will need to be heated to 4-600 C.  A burner similar to an older spiral stove burner would work but I'm afraid it wouldn't be able to reach the required temperature range.  The diameter of the burners surface needs to be at least 3 inches. Ive searched and searched but am unable to find much that looks like it will work.  Could someone explain how to possibly make something with some sort of heating element?  Any ideas?

Question by Bhall06    |  last reply

Flying Pig Website

If anybody likes automata, but can't be bothered to work in wood and metal, try Flying Pig models.They (mainly he) make and sell cardboard kits that move in interesting ways.Obviously, most of them are for sale, but he has some free models for downloading, which change very occasionally.Probably the most interesting parts of Flying Pig for this site, though, are his Workshop Notes blog, where Rob updates readers on the process he goes through developing his models (he's part way through a dinosaur at the moment, and has released a kids range).He also has a section of mechanisms, with animations of all the paper mechanisms he uses, plus several that don't go into paper models (like a stirling engine).Generally, it's a great resource for anybody interested in engineering, paper or otherwise.

Topic by Kiteman    |  last reply

Steam Fair and Eden Project photos.

Right, that's it for a while - I'm away on holiday tomorrow morning, a week in Devon.Beaches, buildings four times older than America, and the Eden Project.I may even get my kites flying! (Edit: No, I didn't. The beaches were too narrow, too crowded or too non-existent to fly from. The one decent beach we found for kiting (Slapton Sands) was windless the day we went) PhotosI've uploaded selected images to my Flickr account: are two sets there, the Steam Fair and the Eden project.Sorry, no stills of the Stirling engines (what was thinking??), just this video.

Topic by Kiteman    |  last reply

Solar incineration of biomass for increased energy?

Hi. I'm prototyping a solar energy system which basically collects, concentrates, and transports raw solar energy, and I'm thinking of various applications for it. My main interest is in water purification, but electricity is an obvious one as well, which means steam or, preferably, stirling engine generation. So say I had six square meters of sunlight concetrated into a light pipe and filling an insulated chamber. WIth losses that's going to be at least 5 kiloWatts of power, which is quite a bit and would run an engine pretty well. But what if you had some kind of combustable material in the chamber, like waste organic matter? It would burn, obviously, and release extra energy. And with the chamber full of extra heat largely in the form of light, I'm thinking you'd get a very efficient combustion of the matter and some ammount of the smoke. So, does anyone know if this would be worthwhile? Would the extra energy gained make it worth it? What would the emissions be, compared with just setting fire to it all? What happens to carbon at these kinds of temperatures? etc. Cheers!

Topic by SolarFlower_org    |  last reply

The wimpy power grid! Low pressure air for little jobs. I pumped water 6 ft high with 0.2psi!

So I am not talking a 0.2 psi grid.  Anywhere from 1 to 4 psi should work for the little jobs.  All  you have to do is make feeble wind or water or solar panel or Stirling engines to power the  pumps and the pumps are just a couple of ft of tubing!  So, 1 psi is nothing! We should be able to make it in all sorts of ways.  My air comes from a 3.5 Watt bubble pump until I (or you) figure out how to run a tiny compressor off my 15 Watt solar panel.    I have a few demo videos including the one here  

Topic by gaiatechnician  

How to Generate low pressure air 0.8 psi for pallet gardens? Stirlinge engines, fluidyne? How?

My pallet garden project is a big success. It works great and it is becoming simpler and cheaper to do over time. It uses aquarium bubble pumps to produce low pressure air and this air is used to airlift pump water that circulates to the plants in the garden  in an endless loop.   I measured a few days ago and my bubble pump is producing 22 inches water pressure (0.8 psi) at the pump and 60 litres per hour of air at this pressure and this drives all the pallet gardens at a great distance (100 ft ) from the pump. I use a 3.5 watt air pump. I would just  love it if it could be off grid, and driven by solar heat in a low tech way.    Anyone want to try to do this?  Because then it is of great value in poor countries.   Just to give you an idea of how little heat you need to make this pressure.  If you heat air from 20 degrees C to 36 degrees C  (68 F to 97 F)  in a closed container, you get 0.8 psi pressure increase in the container!  That is the bar, and it would be really hard to set it lower than that!    I do not yet understand stirling engines or fluidyne pumps but I think they could do this.  If I try it, I will have cylinders of air alternatively heating and cooling  in the sun and valved to pump the air in one direction.  But if you are clever, I am sure you can do better than that with fluidyne or flutterwing wind power. I would love to see some comments and interest in this.   It IS working and people are going to be very interested as gardening season gets into full swing.    Playlists are for the pallet gardening and for some amazing alternative wind, water and solar machines. Thanks Brian

Topic by gaiatechnician  

Solar Death Ray, Robot Foosball, Snow Cannon...

Sign-up for our newsletter here. Dec. 27, 2007 Welcome back! The Laser Cutter Contest ends on Jan. 1, 2008. If you're still sitting on an amazing Instructable, submit it now to win a VersaLaser worth over $15,000! Don't forget to enter the Homemade Holidays Contest! Share your homemade holiday gift ideas through an Instructable, a Slideshow, or a Video, and win great prizes from CRAFT magazine! Check out these cool instructables! Giant Fresnel Lens Deathray: An Experiment in Optics So you don't have access to your own rail gun or military space laser....but never fear, we'll use the sunlight in your yard to instantly set things on fire! posted by DrSimons on Dec 26, 2007 Build a Microwave Transformer Homemade Welder Making a DIY welder is easy to do and it's pretty much FREE! If you feel comfortable playing with electricity, check this out.posted by stasterisk on Dec 24, 2007 Fix a stuck pixel on an LCD monitor Fix those pesky stuck pixels in just a couple of minutes and enjoy a fully functional monitor. posted by Line Master Jorbob on Dec 23, 2007 The Ambience Enhancer Listen to your music in style with this wondrous steampunk device.posted by Porkshanks on Dec 21, 2007 How To: Jailbreak your Ipod Touch 1.1.1 to 1.1.2 (Windows) Jailbreak your iPod Touch to add some custom applications. This is worth it for the instant messenger alone. posted by RTheaven on Nov 19, 2007 Just a few days left to win a $15,000 VersaLaser! The Stirling Engine, absorb energy from candles, coffee, and more! A simple way to get introduced to the Stirling engine. Unleash the power!posted by thecheatscalc on Dec 21, 2007 Build a Wind Harp!A wind harp is just what the name says, a harp played by the wind. You don't need lessons with this instrument, just a light wind will do.posted by botronics on Dec 26, 2007 Cheap secret compartment! Learn how to make a secret compartment that can be built into a bookcase, or some other piece of furniture. A sneaky lock keeps it hidden. posted by Hoverboy06 on Dec 21, 2007 Autonomous Foosball Table The robots are take over living rooms one foosball table at a time. Are you with them or against them?posted by eski on Dec 25, 2007 Pneumatic Snowball Cannon A lot of people make potato guns, but it's winter so let's shoot some snowballs instead! posted by cvxdes on Dec 18, 2007   Now go make something awesome, and I'll see you next week! - Eric

Topic by fungus amungus  

(newsletter) TV-B-Gone kit, LED Bike Jacket, Tetrahedral Kite...

Sign-up for this newsletter: Welcome back! Get the LED Out! Contest - Enter any Instructable that involves LEDs, and win some amazing lights from Monkeylectric! Mother's Day Contest - Help decide who wins a Singer sewing machine! Vote now! The winners of the Epilog Challenge have been announced! See who won the Epilog Zing laser, and gift certificates for lasercutting by Ponoko!Coming next week...Show us an amazing sound-related project, and win an awesome set of hand-built custom speakers in our upcoming Art of Sound Contest! Make Your Own Laptop Skin Light for Life: Glowing Button Cycling Jacket TV-B-Gone Kit Make a Wire Wrapped Ring Make it glow, and win Monkeylectric lights! See who won the laser cutter! No-Solder, Funny Robot in Minutes Make Your Own 29er Bicycle! Stirling Engine Rotating LED Throwies Fancy Steampunk Blunderbuss Rifle Joule Thief Night Light Tweet-a-watt - the Twittering Power Meter Cheap Light Box Fly a Bell Tetrahedral Kite Vote for your favorites! Get the grill ready! Turning a Wine Bottle into an Oil Bottle Homemade Ripstik / Waveboard Planter from Pallets, No Nail Pull Method The Sigh Collector Sign-up for this newsletter:

Topic by fungus amungus  

Machined Spring Powered Car

OK, I think after posting in some of the other forums that maybe this is the best place. I have asked for some help in the Tech, Science, and Burning Questions Forum (Not sure if I should have started a new thread in each one for this project so if I should delete the other's please let me know). I am new to the forums and just signed up for a 2 year pro membership to help contribute as I have been viewing on and off here and there for the past few years. If anyone can help me make this, it would be much appreciated! I came across the object shown in the link below and shown in the attached pictures. It is the  "Toy Car" by the designer "Wouter Scheublin". It is a spring powered toy car made in the limited edition of 20. It does not look very complex, but does look elegant. It can be purchased for close to $3,500.00 US on the justification that it is art, but that is not something I will ever be able to afford for this type of object. I am not insinuating that it is not worth it (last year I actually contacted the designer as well as the people selling it for him to see if I could pick one up for substantially less).  In any case, please check out the link below for pictures and let me know where a good place to start making the components might be or just where to start in the design and build process period would be. I guess I would need to know the actual parts needed before I could start to assemble even something remotely similar and I figured the geniuses that use the forums here could help me (being that its December and in the spirit of giving and sharing and all) or maybe someone here might even be interested in possible making with me. Thanks in advance for your consideration and reply. See Link Below. On another note, I really really love this kind of gadget. Metal (or wood), Mechanical, Simple, Elegant. I have searched everywhere and have trouble finding a site specific to these types of objects. small precision desktop machines like a well machined Stirling engine or the like. (no need to be powered. Can anyone point me to a place that has such things. Another example of something I like (and did purchase) is the super precision gyroscope from Another example of a mechanical gadget I would love to have or like to read about is.

Topic by onyx77  

2008 Instructables and Universal Laser Cutter Contest Finalists

The winner has been announced here!Instructables and [ Universal Laser] are happy to announce the 14 finalists in the Laser Cutter Contest. Ten of the finalists were selected by judges at The other four finalists were the Instructables that had the two highest pageviews or ratings as of Monday morning, Jan. 7.The authors of these Instructables are all in the running to win a VersaLaser worth over $15,000. Now we turn the voting over to you. Click on the "Vote!" buttons below the Instructables to submit your vote and help decide who wins the grand prize. You can vote for more than one Instructable and voting closes Jan. 31. Judge-selected Finalists(in alphabetical order) Autonomous Foosball Table Build a Greenland Kayak Build a Wind Harp! Build yourself a portable home - a mongolian yurt Extreme Business Cards Giant Fresnel Lens Deathray How I built a carbon bike frame at home (and a bamboo frame too) How to Enter the Ghetto Matrix (DIY Bullet Time) Laser cutter, start slicing stuff for under 50 dollars Laser Image Projector Ratings and Pageviews Finalists How to Make a TRON Style Lamp: The MADYLIGHT How to build a sit down driving arcade cabinet The Spiral Data Tato -- A Curiously Complex Origami CD Case Blu-Ray Laser Phaser! Second Place The authors of these Instructables win a robot t-shirt and a laser-etched plaque. Listed in alphabetical order. 30 minute USB microscope The Ambience Enhancer Autonomous, Wirelessly Controlled Hovercraft Conductive Glue And Conductive Thread: Make an LED Display and Fabric Circuit That Rolls Up. Cool Wave Ring Dollar Store Parabolic Mic Handcut inlay A Home Power Plant - Wind Power Generator Revised How to Make a Color-Changing Lighted Faux Fur Scarf How to make a pair of Angel Wings How to Make an OAWR (Obstacle Avoiding Walking Robot) Make DIY Vanilla Extract "Quicksilver" Retro-Future Scooter from appliances and scrap metal Solid Wood Digital Clock The Stirling Engine, absorb energy from candles, coffee, and more! Squishy Breast Stress Relief Toy TiggerBot II Robot Tube Amp Rebuild (and Mod) U-Disp - The Digg (tm) display (Open Source)Wooden Gear ClockThank you to all the judges: ewilhelm, jesse.hensel, PT, randofo, intoon, canida, noahw, stasterisk, fungus amungus, lebowski, T3h_Muffinator, and bofthem.

Topic by fungus amungus    |  last reply