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Compressed air engine

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Unread postAuthor: jor2daje » Thu Jul 28, 2011 12:05 am

I've built a few air engines, I used a wobbler engine design you have a piston and cylinder assembly that pivots on a flat surface, the piston has a flat that essentially seals with this flat surface. The cylinder has one hole in it that let's air in and out, and the flat surface has two, one for intake and one for exhaust, as the crank rotates the cylinder pivots and lines up with each hole accordingly. For stirling engines you should look at marble displacer types, they are incredibly cool and I think much more interesting to watch. The only tricky parts are the graphite piston and the geared flywheel.

Image

Image

If you want I'll grab a picture or two of my marble displacer engine too.
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 28, 2011 4:41 am

jor2daje, I enquired in the lathe thread and I'll enquire again, any chance of seeing this little beauty running?
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Unread postAuthor: ramses » Thu Jul 28, 2011 8:04 am

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Unread postAuthor: jor2daje » Thu Jul 28, 2011 9:59 am

Sorry jack must have missed that in the last thread
[youtube]http://www.youtube.com/watch?v=KCyDhwyMNzI[/youtube]
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Unread postAuthor: Gun Freak » Thu Jul 28, 2011 10:23 am

Beautiful engine, too bad I don't have a lathe :P
I've seen an engine like it but was made of wood. It is a good design. I think the type like I posted would be easier for me to construct, since I don't have a lathe or mill to make the flats. But I'm still deciding which to use.

For my stirling, I want to make an LTD and a candle one, but the marble displacer ones are interesting too. Makes a candle a bit more interesting :)
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Unread postAuthor: jackssmirkingrevenge » Thu Jul 28, 2011 10:30 am

jor2daje wrote:Sorry jack must have missed that in the last thread


No worries :)

Sexeh! and just 15 psi, nice :)
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Unread postAuthor: Gun Freak » Thu Jul 28, 2011 1:14 pm

Dang I need a Sherline :lol:
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Unread postAuthor: jrrdw » Thu Jul 28, 2011 5:21 pm

Here's one that I like.

[youtube]http://www.youtube.com/watch?v=vcaFWg-FvbQ[/youtube]
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Unread postAuthor: Gun Freak » Thu Jul 28, 2011 10:42 pm

Jrrdw I love that one! I just can't figure out how it works :(
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Unread postAuthor: jor2daje » Fri Jul 29, 2011 12:06 am

It's the same principal as my engine, only with three cylinder assemblies.
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Unread postAuthor: POLAND_SPUD » Fri Jul 29, 2011 5:13 am

It's the same principal as my engine, only with three cylinder assemblies
I have to join the discussion to point out that the simplest air engine can be built with an air cylinder and a 3 way valve
:D

Though a 5 way valve would be even better
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 29, 2011 5:47 am

POLAND_SPUD wrote:I have to join the discussion to point out that the simplest air engine can be built with an air cylinder and a 3 way valve


Yep, cylinder connected to a crankshaft, at the end of the stroke hits the 3 way valve and the cylinder retracts etc, I can see it.
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Unread postAuthor: POLAND_SPUD » Fri Jul 29, 2011 6:01 am

I can see it
ohh btw now that you have a lathe you can build your own DCV valve... get a block of aluminium, drill a hole all the way through it then 3 perpendicular holes for ports and finally turn a spool
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 29, 2011 6:42 am

POLAND_SPUD wrote:ohh btw now that you have a lathe you can build your own DCV valve...


I know, I know... but who needs it with a detent system? I have a 0.22" semi-auto on the drawing board with a blow-forward interrupter...
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Unread postAuthor: jrrdw » Fri Jul 29, 2011 2:06 pm

Gun Freak wrote:Jrrdw I love that one! I just can't figure out how it works :(


This will help you out if you haven't read it all ready.

Pneumatic Motor.
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