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Compressed Air Motor

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Compressed Air Motor

Unread postAuthor: meatballs » Thu Apr 26, 2007 3:35 pm

lately i've been contemplating the idea of building a small motor to run off compressed air, regulated to probably twenty psi or something like that. i'm thinking i want to use piston(s) rather than a turbine, i think it would be cooler. has anyone done something like this? any brilliant ideas about what to use for components (piston, cylinder,etc) i would like to make it double acting, giving a power stroke in both directions rather than just one. i am thinking i want it to be small, cylinders around half an inch or less. any ideas would be much appreciated

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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2007 3:38 pm

Have a look here

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Unread postAuthor: ShowNoMercy » Thu Apr 26, 2007 3:42 pm

You could just grab a small two stroke engine and put your air injector in it and voila. But I believe you would get better power from two turbines, that way you can get high pressure and a low pressure turbine. All steam systems are this way for a reason. You dont see to many fire tube boilers on trains anymore.
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Unread postAuthor: lukemc » Thu Apr 26, 2007 3:50 pm

im pretty sure 20 psi wont move a metal 2 storke engine SNM. i like jacks idea though
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Last edited by lukemc on Thu Apr 26, 2007 3:55 pm, edited 1 time in total.
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Unread postAuthor: ShowNoMercy » Thu Apr 26, 2007 3:53 pm

You would be surpised with a little engine that is properly lubericated. But yes I guess you would get the most out of a small piston. However that will be not be fun machineing.
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2007 3:54 pm

lukemc wrote:i like jacks idea though


Not my idea at all, it's how practically every CO2/Air powered motor (like the sort used in model aircraft) works.
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Unread postAuthor: ShowNoMercy » Thu Apr 26, 2007 3:55 pm

Well you did propse it onto this forum therefore you got the credit for searching for it.
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Unread postAuthor: jrrdw » Thu Apr 26, 2007 4:51 pm

You can find the C02 plane engines on Ebay from time to time. It's a short ride though, the C02 don't last long. What do you have in mind for it if you build it?
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Unread postAuthor: meatballs » Thu Apr 26, 2007 6:04 pm

I don't have a specific use in mind, its more the idea that it would be really cool to make. that animation is very helpful, i may do just that. simple, effective. I'll check ebay too. I was wondering about the motor on AirHogs airplanes, i used to have one and it was awesome, but i think it broke and i didn't foresee wanting the motor. Any ideas where i could get some of those cheap?
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Unread postAuthor: jrrdw » Thu Apr 26, 2007 6:26 pm

meatballs wrote:I don't have a specific use in mind, its more the idea that it would be really cool to make. that animation is very helpful, i may do just that. simple, effective. I'll check ebay too. I was wondering about the motor on AirHogs airplanes, i used to have one and it was awesome, but i think it broke and i didn't foresee wanting the motor. Any ideas where i could get some of those cheap?


Ebay, for the airhogs. You probly wont get the C02 motor cheep.
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Unread postAuthor: meatballs » Thu Apr 26, 2007 9:54 pm

I don't necessarily want a CO2 motor, any compressed gas motor will do. and even if i did get a manufactured one, i think it would be sick to build my own. how much pressure do the CO2 motors run at?
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Unread postAuthor: jackssmirkingrevenge » Thu Apr 26, 2007 10:47 pm

Airhogs and CO2 motors work exactly the same way, only the CO2 motors run at higher pressures and are more finely engineered. They're filled directly from CO2 bulbs without being regulated so I guess they run at about 850 psi max.

They're not at all expensive on e-bay, have a look here :wink:
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Unread postAuthor: jon_89 » Thu Apr 26, 2007 11:49 pm

what parts do you think i will need to make a co2 motor?
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Unread postAuthor: SpudBlaster15 » Thu Apr 26, 2007 11:52 pm

I built a small pneumatic engine about a year ago. It is rather similar in operation to a 2 stroke gasoline engine, except instead of a movable piston to connecting rod joint, the cylinder rotates upon it's mount, and as it does so, it uncovers/covers an intake and an exhaust port. At 120psi I have clocked it at over 5,000RPM using a tachometer. At 150psi, it accelerated to 7,000RPM before snapping the brass connecting rod. Machining a new piston/rod assembly was simple.
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Unread postAuthor: jon_89 » Thu Apr 26, 2007 11:55 pm

what did you make it out of
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