Instructables
Picture of Beer Can Jet Engine: Mark II
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LBO
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This is the new and improved version of my Mark I Origional Beer Can Jet Engine. It has a far more severe throat in the air intake to aid compression, a new power suply that is variable and works of mains electricity (instead of a complex power pack) and an inline fuel injection system that opposes the direction of air to improve the fuel-air mixture.

The results were mixed, it wasnt the massive improvement in performance i was expecting but i am pleased that it wasnt a complete failure, i have learned alot about the construction and opperation during my investigation and experimentation and hopefully in the Mark III Engine the culmination of the two builds with result in one engine of definably superior performance.

Visit my website for more information and other similar builds: Letsbuildone.110mb.com
 
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Step 1: Gather the materials and tools you will need

Picture of Gather the materials and tools you will need
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Materials Required:
@ At least 4 Steel cans, specifically the taller ones and bigger ones are better.
@ Copper tubing, i used half inch diameter plumbing tubing i had in the garage for its rigidity as this will hold your engine together.
@ Some flexible plastic fuel hosing long enough for you to be comfortably far enough from a running miniature jet engine, 3m 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 dimmer switch of a house light switch in series with the mains power pack.
@ 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
@A solid piece of aluminium at least 2.5cm diameter, cylindrical, aluminium to save weight and you want it to be up to say around 10cm long to improve fluid dynamics and less than around 5cm diameter. this will be the fuel injector and it will also double up to throttle the air flow to increase compression.

Tools Required:
@ Sand Paper, to smooth and remove paint.
@ Soldering Iron possibly to solder the powerpack.
@ Possibly a screw driver for any choca blocks.
@ Drill to drill fuel nossles with.
@ Sharp knife for cutting cans, tape and general use.
@ Scissors for cans tape and general use.
@ Pliers
@ Relevant Safety equipment, gloves, goggles, fire extinguisher and COMMON SENSE.
@Laithe to turn the aluminium. you may be able to use a clamped drill but be very carefull and use your college or schools laithe if possable as then you can be supervised by trained staff while it is in use.
@Assorted cutting bits, files, wire brushes, and other abrasives to
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GaganS22 days ago

Hi

Thanks for your instructable

I wanted to make an RC plane with the engine. So please let me know which engine (MK1/MK2) is better in amount of thrust.

PS: Sorry for my bad english.

jasshopper1 month ago

Is there any alternative fuel that could be used like petrol or kerosene if yes how or what changes should be done to this?

If you could turn it into a mist (possibly from an ultrasonic humidifier attatchment) you could use any fuel in theory

thundercookie6 months ago

coolieo

2004968 months ago

hello,

I am going to make this soon but I would just like to ask whether you need a fan or can you work without it ?

willdubz9 months ago

Im going to try to make this today but am going to try to have the power controlled by a raspberry pi and control the pi via local server. The only thing I wouldn't know were to find is the aluminum fuel nosel.

This is brilliant,
I'm going to use a s- force fan that spins upto 40,000 rpm and they can lift there self off the ground does anyone have any views on it.
can u plz tell me in detail, how did you calculate the thrust for the mark 2 engine!!! I am trying to make a similar engine but am having some problems in the calculations.....
reply soon!!!
LetsBuildOne (author)  jegdhfgrbfhf4 years ago
Aren't they around 48v? If your planning to have it mobile rather than on a static rig you may want to consider how your going to power it. They draw quite a few amps so your battery is going to need to be large and will deplete quickly... Sounds like it would be a beast though!

You may also find that it moves air faster than the burn rate of the fuel so the flame front won't maintain in the combustion chamber so you may need to use a flame tube to slow the airflow from the fan enough to maintain the combustion. This is simply a steel tube you squirt the fuel into with holes around the outside to regulate the air flow. If you google "Flame Tube" you should find several examples.


LBO
whats the mesurements for this?
Charith951 year ago
i'm not clear how to start the combution .Don't we need to supply electric shock or fire externally to start the process. how to protect the fan by the combution ?. please reply me to my email.. email- charithonline@yahoo.co.uk
Nice
Matt4281 year ago
On the title, it is supposed to be spelled mach II, not mark II
SkeptiCol1 year ago
I'm not sure if it's something Intructables are doing, or how this was loaded, but I am having trouble following as all the photo's are at the start and all the text at the end. My brain is having trouble matching the pics to the steps.
LetsBuildOne (author)  SkeptiCol1 year ago
Yeah this is new, It didn't always look like this. In future Instructables I'll make loads of little steps instead.
agm5102 years ago
What did you use as a fuel
LetsBuildOne (author)  agm5102 years ago
Butane lighter refills. They come pressurised and don't require a regulator. I also tried petrel but it doesn't have atomising fuel nozzles.
Verstrent2 years ago
Can i use it for flying project such as flight shoes?
LetsBuildOne (author)  Verstrent2 years ago
Flying projects should be fine though I would need more information to say if they would be ok for 'flight shoes'. Just in case it was you're plan, it is not gradable that these engines could lift themselves vertically let alone a person aswell.
Verstrent2 years ago
if flying shoes sucesses, i could fly around the world
rayabel2 years ago
Please take several photos and decide if you need to take more photos until you get a focused photo.

Other than that, cool engine.
LetsBuildOne (author)  rayabel2 years ago
The engine doesn't exist any more and the photo's taken weren't for instructable use. They were mainly for posterity. In future I will make sure I get high resolution, focused photographs in future though. Thanks for the feedback.
Hi,
I am from india and made an rc plane in brussels, I make rc planes, rc trucks, rc sidecar and rc speed boats I wanted to make something new so i thought to make an jet engine. Can you please tell me how to build it , Can I use iron (mosquito spray )cans, I used a hairdryer deduct fan and a rc helicopter motor.Can you tell me the what to do in the step 5 (fuel injectors).Please reply me as fasty you can . Please please please help help me!!!!!!!!!!!!!!!!!!!!!!!!!!!!
LetsBuildOne (author)  avionic modelisme2 years ago
Try the fuel ring from my Mark I engine: http://www.instructables.com/id/The-Origional-Beer-Can-Jet-Engine/

The ducted fan and heli motor will work great. so will the mosquito can. make sure it is COMPLETELY empty before you think about opining it though and wash it thoroughly as the contents were poisonous.

Good luck :)
Hi,
Thanks for a quick reply.About your engine my friend (the one who helped me in my projects and the owner of avionic modelsime in brussels www.shop.avionic.be) sebastien maes thinks that the engine may burst on this temp. after a few seconds.And about the hairdryer fan he said it wont work . He told me to use a stainless steel can.And to use an edf fan.About the fuel it may explode so we may use kerosene. He told me that he can ask anyone to make an lathe fuel injector.He want the plans for it can you send me them on my email- singhadityapartap4@gmail.com , and if you want to make an engine which may produce a lot of thrust and work for a lot of time you can follow these steps :) Can you please send me some pdf on my email as I cannot be a member on this website as my mom won't allow me. :)
Hi,
Won't the iron will melt at higher temp.
please send me pdf and plan for fuel injector
LetsBuildOne (author)  avionic modelisme2 years ago
Iron and steel melt around 1500 dg C but your engine shouldn't melt, Mine didn't. To ensure this, sleeve the combustion chamber in a tube that leaves a gap around the circumference and overhangs the exhaust by a short distance. This will act like a venturi and draw cold ambient air over the hot combustion chamber, cooling it and aging to the engines thrust.

Don't use the fuel injector from this engine, it is heavy and didn't work well. Use the one off the mark I engine. That worked well.

An EDF we will work much better than a hair drier, if you have one, use it.

You can use kerosene but you will need atomising fuel injectors and a fuel pump. This is much more complex than using pre pressurised gaseous butane.

If you still want the CAD I can send it you but the mark I solution is much better.
Hi,
Thanks again for a quick reply.About the fuel injector i will ask Sebastien maes and see what will he say.What can we do to increase the thrust? About the butane gas he said it is dangerous to use it and it may burst and harm us.Can you send me the pdf for this engine? Which engine worked better- mark1 or mark2 ?
LetsBuildOne (author)  avionic modelisme2 years ago
Sleeving the combustion chamber in a second larger tube that overhangs the exhaust will increase thrust as it draws cold air in via the venturi effect, this air is heated while simultaneously cooling the combustion chamber, as the air heats up it expands, as this air is mixed with the exhaust gasses it produces further thrust. This is the same as most modern jumbo jet engines. The majority of the air bypasses the combustion chamber.

You can also increase thrust by increasing the power of the fan, the amount of fuel burnt and the temperature at which it is burnt.

If you use butane you should use a nice long delivery hose. The first time you use it, it will flush the air out of the hose leaving only butane. Without oxygen the butane cannot burn so your butane canister can be remote from your engine and it will be relatively safe to use.

The mark one engine was significantly better than the mark two. Mainly because of the fuel injector, it was heavy and didn't work particularly well.

I am e-mailing you the pdf's now
Hi,
Thanks a lot :):):):):):):)
Wesley6663 years ago
Been working on a jet engine again, its almost done and ready to test. It is a turbofan design, self sustaining, so no electric motor turning the compressor, and I made it from an old computer and a soup can. I used bushing from computer fans instead of bearings, I am hoping they won't melt, they shouldn't but its a possibility. The casing of the computer was steel so I used that to make everything. It was very hard to make 3 turbines that were balanced, but I did it. I am just finishing the combustion chamber and the turbine in the back that drives the compressors in the front. I used a long shaft from a CD drive, it was the shaft for the tray to go in and out on. Will post pictures of it sometime, and will try to video tape me attempting to start it.

Also, whether or not mine works or fails horribly, I had a great idea for the next one. First, I want to make it bigger, easier to work on, second I want 2 to 4 Fuel Injectors from a car that I can use to inject gasoline or other liquid into the combustion chamber and last, I want to get a machine shop to make some parts so they are perfect. I think this would step it up even more and produce something that would work without a problem.
As well, a spark plug with a system that continually fires a spark every second or so, to make sure the thing stays lit and I don't have to light it with a torch to begin with.
LetsBuildOne (author)  Wesley6662 years ago
I currently have a bag full of fuel injectors, a high pressure pump, coil packs and a spark plug or two for just this purpose. This project is on the back burner for now though as the current project is an electric bike and research into water injection and hydrogen power for internal combustion engines.
Aron3132 years ago
How much thrust?????
LetsBuildOne (author)  Aron3132 years ago
Around a pound or half a kilo.
hayme3 years ago
don't call me crazy but if you can make this thing stable and mount it on some kind of hydraulic device and put it on your arm, is it possible that you just have built a jet sword type thing? Tell me the possibilities.
LetsBuildOne (author)  hayme3 years ago
I suppose so. Especially with petrol as the fuel. Kind of like an arm mounted flame thrower if that's what you wanted.
rabb729943 years ago
possibly a spent C02 cartridge?
LetsBuildOne (author)  rabb729943 years ago
Yep, that would work.
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