Introduction: Jet Engine Made Out of Empty Beer Cans!

Picture of Jet Engine Made Out of Empty Beer Cans!

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Build a functional jet engine out of empty beer cans and an old hair dryer. Minimal tools required.

I had always wanted to make a jet engine, then, one day i realised i had the parts available to do it. So, I did!

It was made out of STEEL beer cans, copper hydraulics tubing and an old hair dryer.
It produced measurable thrust which was only briefly tested on a rig that utilised model train tracks and 4 boggies.

More information is on my website at: https://letsbuildone.wordpress.com/jet-engine/


I have a video of various tests in the development process and it in action on my website and below:

Video Link

Video link
I Appologise for the poor quality pictures that were taken on my old phone. Unfortunately the engine has been ravaged for parts by my brother, so i can't take new photos.

Step 1: Gather the Materials and Tools You Will Need

I had wanted to do this for a long time then one day I noticed I had the part available to make a crude Afterburning Ducted Fan (aka Motorjet or Thermofan) engine from a coke can, an old hairdryer and some copper pipe I had lying around. This is not the instructions on how to make that but rather the instructions on how to make the refined version that I completed in college before I went to university.
Mark II is currently under construction and should be completed shortly with a full write up and videos.

Materials Required:
@ At least 4 Steel cans, specifically the taller ones and bigger ones are better.
@ Copper or steel thin tubing, hydraulics tubing from a scrap car will do.
@ Some flexible plastic fuel hosing long enough for you to be comfortably far enough from a running miniature jet engine, 1m did me, I got some from my local model shop used for nitro cars.
@ An old hair dryer or other air moving device, leaf blower could work, or a ducted fan/propeller.
@ A variable resistor or potentiometer, I used a scalectrics controller then upgraded to a dimmer switch of a Light after the scalectrics controller started smoking.
@ A length of wire as long as your rubber hosing at least, two wires needed to power electric motor for your fan.
@ Really small drill bits and a drill, 1mm or less for fuel nozzles.
@ Tape, adhesives and solder would be helpful.
@ Insulation tape

Tools Required:
@ Sand Paper
@ Soldering Iron possibly
@ Possibly a screw driver
@ Drill
@ Sharp knife
@ Scissors
@ Pliers
@ Relevant Safety equipment, gloves, goggles, fire extinguisher and COMMON SENSE.


Step 2: Disassemle Your Hairdryer/ Blower Unit

Picture of Disassemle Your Hairdryer/ Blower Unit

Open your air moving device, preferably old hair dryer, cheep ones available at supermarkets in the value range. Obviously make sure it is unplugged first and you have relevant safety equipment.

Take out the electronics and examine it, you do not want the heating coils of the hair dryer, coils in series with the motor act as voltage dividers, removing them may burn out the motor.

Cut the wires to the motor and lengthen them.

Take your variable resistor and put it in series at the other end of the long cable coming from the motor, if you use the dimmer switch then it can replace the existing switch. Solder where possible and cover connections with insulation tape.Put the finished electronics in a project box or other non conductive container.

If possible use a battery rather than mains power as mains power is very dangerous and make sure you get a qualified electrician to check your work, this was easy for me as my brother is a sparky.

You should now be left with a power source connector, a box with a variable resistor in and long wires that are thick enough to handle the current leading to your what effectively now is a ducted fan.

Step 3: Start Cutting Up Your Cans

Picture of Start Cutting Up Your Cans

Get your STEEL cans,

make sure they are steel because aluminium will melt and disintegrate in seconds if you try to use it.

Dispose of the contents and use a can opener to cut the top off.

Use a metal file or a sander or something to sand the bottom until the indentation in the middle drops out. if you have the tools then use a core cutter to cut the bottom dent out instead, it will most likely be faster. (The aim of this step is to cut the end off like you did with the top but obviously a can opener won't work on the bottom as there is no rim).

You should now be left with a can you can see straight down the length of. You can use some pliers to make the flange on the bottom neater.

On another can cut the top and bottom off on the flat not tapered bit, then slit its length so that you are left with a flat piece of thin steel. Repeat with a second can.

Then finaly on a third can cut out the bottom of the can like you did on the first one and cut the top quater to one third off and put a slit down its length about one inch deep.

Step 4: Make Your Fuel Injection Ring

Picture of Make Your Fuel Injection Ring

Take your copper pipe or hydraulics piping and cut a length about three times the diameter of the cans you are using. They should be the standard diameter drinks can so you will need around a half a meter.

Crimp one end of the tube then bend this end into a circle just small enough to fit inside a can. Mark the last 190mm and bend it so that it fits the internal diameter of the can in a ring.

Drill a hole in the bottom of the can you just cut the top and bottom off, right on the rim at the very bottom. Crimp the end that you are bending so no gas can come out and thread the pipe into the can, if you use copper it should be easy to bend it in and out without crimping the pipe accidentaly.

Flatten your tube which is now shaped like a "p"just on the round bit, not totally but just enough so that you can drill the previously round surface.

Mark around 8-16 places around the circle in even increments and drill the smallest holes you can in so when you blow through the tubes open end it has 8-16 jets of air perpendicular to the tube effecively out of the face of the "P"

Thread the round bit with the nozzles inside the can with the nozzles facing towards the far end of the can. Now wrap the excess piping around the outside of the can concentric with the internal counterpart, which should leave you with about 100mm of tail off away from the can.

This is where you attach your rubber hosing to so take this bit with you to make sure you get the right diameter fuel hosing, it must be a very tight fit.

Step 5: Make Sure No Flames Come Out the Back

Picture of Make Sure No Flames Come Out the Back

Take the can with the top third cut off and slide this over your first can from the bottom so that your copper pipe is popping out of the slit and the two open bottoms are about 25-50mm apart and the can walls are concentric.

Get the sheet metal from the flattened can and roll it into a small diameter tube, put this tube inside the two cans and let go so that it settles to the right diameter.

Use some Duct tape to secure the tube in this diameter. cut off any exes and staple in place with a strong stapler. If the stapler isnt strong enough, make the holes first and then use pliers to bend the staples or a paper clip into the right place to secure it.

Step 6: Make Your Ducted Fan Adapter

Picture of Make Your Ducted Fan Adapter

Take the other piece sheet steel you made and roll it into a tube/gentle cone around your ducted fan unit. Secure this end in place with tape.

Take the other end of your sheet steel tube and put that into the cone coming out the back of your engine. Secure this end in place with tape. Then use a stapler as previously described to secure this end, Duct tape cannot take the temperature.

***Note, most of the pictures in this instructable were from my mark II jet engine hence the hole in the cone which shouldnt be there in this version, and the combustion chamber with no copper tube input. unfortunatly these are the only photos currently available but i will replace them asap.***

Step 7: Make a Stand for It

Picture of Make a Stand for It

You have the main body of your engine constructed,

I now got two small jubilee clips and threaded them over two large jubilee clips.

I then took two pieces of about 12mm copper pipe and bent each into a "U" shape.

Threaded these two pieces through the small jubilee clips.

Put the engine's combustion chamber through the two large jubilee clips.

Drilled 4 holes into a piece of MDF.

Put the ends of the copper pipe "U"'s into the four holes drilled in the MDF.

Finally tighten the jubilee clips to secure everything in place.

Step 8: Test It

Picture of Test It

It usually takes two people to operate, one on lighting and fan speed and the other on fuel injection:

@ Turn up the fan to get some gentle wind going through.

@ Second person opens valve on a lighter gas canister to feed Gas to the engine, squeeze one of the plastic adapters in the top of the can into the end of the poly fuel hose.make sure the can is the right way up otherwise liquid butane comes out and the engine will flare and blow out.

@ First person uses long ended lighter or blowtorch, safety glasses and gloves to ignite the gas and start the engine.

@ If it goes out the fan is on too high power, if it goes the wrong way and flares out the fan there is not enough fan power.

@ Then fan power is slowly increased to a point where the flame is invisible but still there, or if it is dark you may be able to see the blue cone out the back.

@ If butane is not already on full power it is turned up and balanced with fan to retain blue cone until full power is achieved, if your feeling adventurous experiment with slowly inverting the butane to trickle liquid butane into the engine, if done right you can boost the power.

@If the engine body glows brighter than an orange or something goes wrong: the butane is shut off, the fan can be restarted for cooling purposes and man on standby with co2 fire extinguisher runs in to rescue.

@ Take a video and send it me at LetsBuildOne@Live.co.uk, id love to see other peoples attempts! the good the bad and the catastrophic.

Further Details Similar Projects And Videos Of Mine In Action Are Available On My Website at:

Let's Build One


Thanks For Looking

Comments

kgaurkhede (author)2011-04-14

hey any ideas for ignitor
& here r some pics of my next jet the "turbojet"

ThePyroDUCK (author)kgaurkhede2016-09-13

Hey! Seriously awesome. But i had this doubt that will the turbine and compressor be efficient if u use that metal strip to hold that shaft ??? Woudnt bearings be better? And will they be able to withstand the temperature ? If yes then how to use them?

LetsBuildOne (author)ThePyroDUCK2016-09-13

Bearings would be better. The centre of the fan blade does very little in the way of moving air anyway, so the circular space they take up shouldn't make too big a negative impact on performance.

You would probably have to use Ceramic bearings, and use a cold air by pass to cool them.

If the metal strip was orientated in line with the air, then it would be much better. You could also use a very stiff prop shaft, and have bearings in the air intake only. So the hot tail end doesn't need any bearings.

Modern turbo fan engines have a large proportion of blow by design.

Wikipedia has a good cross section:
https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/Turbofan_operation_lbp.svg/1280px-Turbofan_operation_lbp.svg.png

ThePyroDUCK (author)LetsBuildOne2016-09-13

Hey! Sorry to disturb again but i have some seruous doubts and i want to make one dearlt. So :
#1. Does a turbojet have a motor? I see u have used one but i generally see or atleast have concluded that the fan is usually connexted to the shaft? But i can use the motor. But which type? Wont it get turned yo liquid cuz of the heat?
#2. I really dont understand how prop shadts work. I googled it but still no idea. Could u plzz explain? Or do i use to bearings?
#3. About the compressors and turbines. Are the compressors inside the focused inlet [combustion chamber ] or fuxed before it?? I read that smaller the compressor the faster it rotates. So i could keep the compressor inside but where do i put the turbine?? Inside or outside?
Thanks for ur time.

LetsBuildOne (author)ThePyroDUCK2016-09-14

#1. My design does have a motor. It's technically an after burning ducted fan. Rather than the stereotypical turbojet. Mine is from a hair dryer. An Electronic Ducted Fan (EDF) designed for use in model aeroplanes would be ideal. They're Brushless DC motors, which require an Electronic Speed Controller (ESC) to run. HobbyKing is a good website for these. The motor won't melt because it is in front of the air intake. It has cold air drawn over it constantly. It's the exhaust of the engine that could melt.

#2. It's just a spindle that runs down the centre of the can. You could use two bearings at the intake to stabilise it, and none in the rear. This is what attaches the turbine blades in the exhaust to the compressor blades in the intake.

#3. Both are inside the can. They will be spinning at the same speed because they are both attached to the same spindle/prop shaft.

ThePyroDUCK (author)LetsBuildOne2016-09-13

I seriously dont want to use bearing at the hot tail..so plzz tell me bout the prop shaft and where do i find it...

ThePyroDUCK (author)kgaurkhede2016-09-13

And Can u plzzzzz send me ur detailed plans for this engine at quanta8714@yahoo.com

person% (author)kgaurkhede2012-04-25

nice pictures. you just gave me an idea of how to secure the central shaft.
here's my improved design

danprima (author)person%2015-02-22

looool same i didnt know how to do that....

person% (author)kgaurkhede2012-04-24

you can use a spark generator from one of those lighters where you have to push a button. just dismantle it without puncturing the gas store and extend the wire between the spark gap and the generator (if there is one). it would be like a spark plug.

LetsBuildOne (author)kgaurkhede2011-04-15

Looks interesting, what are you using for bearings?

As for the ignition, the standard solution is a spark plug that screws into a boss welded onto the side of your combustion chamber, you would need a coil pack and a decent 12V source like a lead acid to run it though. Another option is to use the spark of a disposable lighter, extend the wire into the can and set the wall gap right. You could also use two bolts that are screwed in from opposite sides of the combustion camber with a small gap between them and discharge a camera flash circuit through them to give a nice beastly spark.

Prathamesh G (author)2016-05-27

WHAT IS THE TEMPERATURE OF THE CAN AFTER STARTUP???????

hazza the gun (author)2012-02-20

I finished it! i made a video of it here: http://www.youtube.com/watch?v=yPvhfkExAlU&list=UU6q74pDLeZFgsPFzckC0MOQ&index=1&feature=plcp

Nicely done! I managed to wedge bits of mine together and use jubilee clips to avoid the smoking tape issue.

It looks like you either aren't putting enough fuel in or the fuel ring isn't spraying evenly, to solve this you can try drilling more holes in the fuel ring or add turbulators to the part of the engine the air and fuel mixes to help them mix better.

Keep me updated!

LBO

hazza the gun (author)2012-01-19

most amazing thing i have ever seen done with peoples old crap. I am going to make this for a school project about re-cycling and re-use, any advice about the type of hair dryer and where i can get one?

Any hair drier will do. The more powerful the better. Power is probably relative to physical size and any power rating though I doubt there is much between them. you could try your local re-cycling centre.

To be honest an Electric ducted fan is probably cheaper and more effective than a hair drier if your going to buy one. They can be picked up for around £15-20 new. You could try ebay, markets, car boots and similar to find a cheap one. I recently bought a Nitro boat with all radio gear and all accessories for £40 from a market. A similar EDF plane should be much cheaper.

ya ty for that i got myself a hair dryer from argos. my next problem, however is finding the pipe used for the fuel injection ring. I went to B&Q at the weekend but the only 5-8mm copper pipe they had was £22.60 a roll! what a rip we dont have any at home and the DT department at school has none either. Where can i get a foot length of 5-8mm copper/steel/brass tube before wednesday?

A scrap yard will have some, it's what they use for brake pipe on cars. They usually let you clip off a few feet for free. Though this may be steel and harder to bend. If you go to a garage then they usually have a roll that they may give/sell you a foot of.

ya does it have to be 5mm cuz i found some 8mm cheap and bought it.

That can work... You may have trouble bending it tight enough so you might want to bend it so it;s central in the can, seal the end and drill your holes around the circumference. similar to my M2 engine but without the aluminium part.

ok ty the jet is awesome im going to start building on the weekend when we can get an replacement hair dryer from a charity shop or pawnbrokers (mine was modern and had a circuit board, and when i tried to re-wire it, it blew up).

Yeah, they often have the heating element in series with the fan so if you remove it the fan gets over volted and blows up... In future leave the heating element in. If it has a cold air setting then I'd follow the wiring and isolate it. Alternatively you could always leave all the electronics in and not re-wire it?

mr kit (author)2011-09-17

is the throttle of the engine controlled by the switch on the hair dryer

LetsBuildOne (author)mr kit2011-09-20

No, it uses a dimmer switch off a light. This was a bad solution though and PWM or a speed controller would be better.

mr kit (author)2011-09-17

if your testing this enjine somewhere like the beach where should i get my power source for the hairdryer.

LetsBuildOne (author)mr kit2011-09-20

You could use a lead acid battery and an inverter. alternatively, if you remove the heating coil you can run the electric motor off a few batteries in series. You will need 24-50v though.

adrian09 (author)2011-07-27

how much thrust is there?

LetsBuildOne (author)adrian092011-07-27

Around one or two pounds, (500g-1Kg).

adrian09 (author)2011-07-26

best way to deal with MDFs and Plywood - use a hand tube saw

kgaurkhede (author)2011-03-27

can you give me any instructable for building a pulse jet for mounting on a rc car or a plane n can u tell how to increase the speed of a motor

LetsBuildOne (author)kgaurkhede2011-03-27

I have never built a pulse jet as they are illegal in my country. I think you can increase the frequency by making the tail shorter and or thinner diameter but you need to be careful as those dimensions are crucial to the engines operation. Higher power from a bigger engine, higher frequency (speed of running engine?) from smaller engine in general terms.

Where do you get the idea pulse jets are banned from ?

I'm not sure to be honest. Maybe scrapheap challenge? The noise is apparently too much for the British public.

kgaurkhede (author)2011-04-18

are the blade designes for my compressor and the turbines are okay or not?
i also have a old insect slayer would it give out some beasty sparks for ignitor

LetsBuildOne (author)kgaurkhede2011-04-18

You're blades aren't ideal as they have no aerofoil section to them and both the ones labelled "1" look to have too much camber on them but I would speculate that they may do the job. Also the relative diameters and numbers of blades look a bit off but they should still work.

We don't have a big problem with insects in England so I have never come across an "insect slayer" before and as such couldn't comment. Give it a go if it'll cost you nothing though because then at least you can tell the rest of us whether it'll work!

kgaurkhede (author)2011-04-16

hey have any idea about making this type of ignitor without using disposable camera
http://www.youtube.com/watch?v=iSvDZok-zdM

LetsBuildOne (author)kgaurkhede2011-04-17

Yes, it can be done but it seems a bit complicated for what it does. It would be much easier and simpler to go to a film development shop and ask for an old disposable camera. They give them out free and are ready built and ready to go.

If you really want to build one like that then you probably want to look at building a step up buck-boost converter using a transistor with a secondary output from your transformer coil to trigger it. It's a lot more work and probably won't do the job any better though.

If you want a beastlier spark than the flash circuit gives add two or three AA batteries on your camera flash circuit. This will step your voltage up from just under 400v to over 1000v. Your flash cap will probably die though as they're only rated to 330v so you'll want to take that out or, if your feeling lucky, put another cap in series with the original one for each of the extra battery you use to split the voltage.

Be careful when messing with these high voltage circuits as they give a nasty shock and CAN KILL if you get shocked across your heart. Wear some rubber gloves and insulate everything before you connect the power source. This isn't worth dying over some simple safety precautions.

kgaurkhede (author)2011-04-14

hey any ideas for ignitor
& here r some pics of my next jet the "turbojet"

kgaurkhede (author)2011-04-12

hey LBO i have sm pics of my thermo jet engine

LetsBuildOne (author)kgaurkhede2011-04-13

Hey kgaurkhede, Thanks for the pictures. Do you have any of it in action?

kgaurkhede (author)2011-03-27

hey LBO i have just made my own beer can jet engine but not using the beer can its actually hard to find here! ( coz i live in INDIA )
so i've used empty deodorant cans instead n some small steel cans
and for air flow system i've used a simple 12volt dc motor with a fan but there is one problem, i cannot get much speed from this motor. can u help me out with this? and ha the motor is taken out from a toy car!!!
for fuel i used another deodorant but it was almost empty!
so when i ran the engine so it lasted for only 10sec now i will try other alternative fuel ( maybe using acetone )
hope you would feel happy

LetsBuildOne (author)kgaurkhede2011-03-27

Hey Kgaurkhede,

Empty deodorant can's are a perfect replacement. If you overvolt the 12v motor you will get more speed from it as the rpm is proportional to the input voltage. It is usually safe to over volt by 50% so 18v would be a good place to start. I have however overvolted a 12v motor to 48v previously to no ill effects so it's down to how brave your feeling as to how much extra. Be careful though, the higher voltage you put in the faster it will get hot and the hotter it will get, if you put too much voltage through it for too long you will cook the engine and it will no longer work.

Deodorant would be a good fuel source, they usually use propane or butane as a propellant so it is as good as using a can of butane or propane. They even come with a decent atomising nosel on the can! The downside is they are low capacity and you have to press the button up close to the intake of the engine which is dangerous and makes RC control difficult. Acetone would be a good alternative fuel. You just have to pre-heat it before it gets into the combustion chamber and use an atomising nosel to disperse it into a fine spray so it will burn efficiently. This will require a pressurised fuel system you'll have to work out by yourself.

Thanks for building one! Please can you send me some pictures or a video?

All the best

LBO

kgaurkhede (author)2011-03-18

hey can i use ceramic coated aluminium cans instead the steel one

LetsBuildOne (author)kgaurkhede2011-03-18

I didn't know you could get ceramic coated aluminium ones? The Ceramic would be fine but the aluminium will probably melt although it depends on the composition. Try it and find out? Please tell me how it goes.

Anupam bhattarai (author)2010-10-17

thank you very much

Wesley666 (author)2009-12-28

This still doesn't work 100% of the time.  I used steel cans and they still melted.  I am trying a new design with purpose made parts.  I have most of it machined out but I wanted to do this right so I wanted to have the exhaust fan driving the compressor fan at the front but I wanted to know, would the bearings seize up?  I was going to enclose then is a metal tube but will they still heat up and seize?

LetsBuildOne (author)Wesley6662009-12-29

Really? I'm impressed! Did you run it for an extended period of time like five minutes or more? I used to run mine for no longer than a minute or two at a time because I was worried it was going from glowing orangey white hot to molten. Are you using Butane? Some other fuels burn hotter than butane.

I found that Mine distorted less when I wrapped a second can around the first. The Videos for my mark II Engine aren't uploaded yet but when they are you will see my augmenting nozzle and how it acts as a heat spreader for the combustion chamber. Maybe adding some kind of heat sink is something to consider.

As for your question on bearings, yes. A normal ball bearing ring race would seize at the exhaust temperature so you have three options;

First use ceramic bearings that can withstand a higher temperature but you need to make sure they can hold up at several thousand and potentially tens of thousands of rpm and they are expensive and relatively difficult to get hold of in the size you want.

Secondly shield your exhaust bearing in a jacket. Essentially having a 1/2" tube down the center of your engine that the bearings sit inside of, maybe with some cold airflow from the compressor blowing down it.

Your third option is to use two or three bearings before the combustion chamber and leave the exhaust with no bearing. This relies on the stiffness of your central axle to hold the exhaust turbines blades central with a restraining ring as a safety. This is my plan and by far my favorite of the three options.

Good luck and keep me updated,

LBO

Wesley666 (author)LetsBuildOne2009-12-29

I was using gasoline and this happened in less then 20sec.  It melted very quickly.  I thought it would have held up better.  Fun to watch though...   : )

I was thinking of doing as you said, having the bearings up front and having a sturdy axle for the exhaust fan.  I was still going to enclose them anyhow for added security because the are regular bearings which I wanted to use cause I have lots of them (FREEBIE!).  I have a metal shell for the engine, it happens to look like a metal version of a glass bottle Coca Cola, but I was going to make a second shell, just a metal tube to direct some air flow over the actual combustion chamber in hopes that it will stay cooler.  The combustion chamber is made of  steel but is at least 5x thicker then beer cans.  Still working kinks out of the fuel sprayer, and I would like to find a small fuel fuel, but I don't think they have one as small as I would like. 

Most jet engine that they use on planes force the air around a central...thing...I think its usually the shaft that turns the compressor and exhaust, but it has to inject the fuel in a ring.  I designed mine so that the air is compressed into a central space and injected with fuel from only one nozzle and I hoped that would make the fuel system easier to construct.  I added a picture of a drawing of an actual jet engine and even though its 2-d and cut away you can see it has 2 combustion chambers which would actually be a bunch all the way round.  Do they do this for a reason?  The second picture is my first rough draft of what I was thinking about and it only has one centralized combustion area.  Do you think that one will produce more power or operate better?

Thanks

Will keep you posted, and I might make an Instructable if it goes good!

LetsBuildOne (author)Wesley6662009-12-29

Thats strange, thermodynamics says that Gasoline burns at a maximum theoretical temperature of approximately 2500°F. The melting point of soft steel is about 2500°F... So it is possible but I'm surprised it happened.

They use multiple fuel injectors on a comercial jet engine to ensure equal combustion through the combustion chambers cross section. They can't use a central one due to the prop shaft being there. The breadth of the combustion chamber and thus the diameter of the spray cone from the nozzle at combustion point dictates that in order for the whole cross section to maintain balanced combustion, several nozzles are need around the perimeter. Your design is fine, the central combustion chamber is ideal and as long as your nozzle is capable of delivering enough fuel to the engine then you will not need multiple nozzles.

I like your design, I can't fault it, having said that my only concern is that you are being too ambitious about the compressive capabilities of your fan. That is a very large throttle on the exhaust so I may be worried about getting flash back.

I'm curious, how did you make/where did you aquire your fuel nozzles and are they aspirating or atomising? Also if you use a fuel pump what is it? my next engine should be gasoline powered but I'm having some difficulty with the affore mentioned issues, any experience or insight you might have would be really helpful :).

Thanks

LBO


Wesley666 (author)LetsBuildOne2009-12-29

How hot does Premium burn, any different?  I have a bunch of gas cans I might have put premium in by accident.  There is a slim chance it was diesel, but I don't think I would have made a mistake like that.

The fuel pump I haven't got yet, I wanted to find a very small one.  I was going to see if I could build one, I want it to be the right size for the job.  I wanted a small one because I wanted to fit it at the front of the engine under a third shell that was going to be purely aesthetics, that way I could remove the whole engine from said R/C car and mount it somewhere else and all I would need is another gas tank and some fuel line.  Probably will go with an automotive one though when I do get to that point and I will turf the aesthetics shell.  As for fuel nozzle I want an atomizing.  I was planning on using the really thin copper tubing to get the fuel there, I think its 1/8th inch, as small as it comes, but the nozzle I haven't figured out yet.  I was going to see if I could solder a .22 or similar shell and drill a tiny hole not all the way through, or sand it down real thin, and use a pin to put the absolute tiniest of holes in it.  The problem with that I thought was the solder will melt, or it won't deliver enough fuel.  I thought about just whacking the end of it with a hammer.  But I thought that seemed primitive and over all not going to work.  I was going to see if its possible to buy an end cap for that size pipe that uses brass fittings to screw on.  I will tell you if I find anything that works for that.

The fan I was using was made of plastic in my first mock up and if it melted the steel can you can imagine what happened to it.  The electric motor I was going to use was fairly hefty and ran at about 18 000 - 21 000rpm.  I thought that with a fairly generous fan would do it.  I am not sure about it now having it driven by exhaust and what not.  The drawing isn't to scale it was a rough draft because I didn't want to forget about it.  I was do some research to see if I could find sizing for anything, or if there are key ratio to certain parts. 

I will keep you updated on progress if I find anything that will help you.


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