New gamma style engine dimensions - some feedback

Discussion on Stirling or "hot air" engines (all types)
metiz
Posts: 1
Joined: Wed Nov 30, 2016 1:50 pm

New gamma style engine dimensions - some feedback

Postby metiz » Wed Nov 30, 2016 2:12 pm

Hi,

Over the past couple of years I've tried, and failed, to build a working stirling engine 6 times. For attempt nr 7 I'd like to stop messing about. I've designed the key parts for a new stirling engine based (loosely) on these plans.
For the displacer cilinder, I want to use a thin walled biscuit can. My intention is to cut it to size and then, using a angle grinder, cut the cilinder all the way through close to the bottom, leaving intact 4 small vertical strips of steel for structural support and taping the gaps up with some heat resistant kapton tape. This to isolate the hot bottom from the cold top.

The dimensions I'd like to use are:
Displacer cilinder: diameter (internal) 108mm, material: steel. thickness: about 0.3mm
Displacer diamater: 104mm, material: balsa wood, thickness: 6mm
Power piston cilinder diameter (internal) 15mm, wall thickness: 1mm, material: steel
Power piston diameter: 14.95mm, length: 10mm, material: steel
I will probably machine the power piston hollow for a lower weight.
The bottom of the can will be used and is made from the same 0.3mm thickness steel. The top will probably be made from 1mm stainless steel.

I still have to figure out the crankshaft, but I want to make sure these dimensions are okay. Contrairy to the plans I linked to above, I'm not realy interested in running this engine of the heat of my hand: a candle will do. I also don't care for raw power, I just want a working engine.

Can someone give me some feedback on these dimensions and the materials I intend to use?

Thanks

thanh-cuibap
Posts: 147
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: New gamma style engine dimensions - some feedback

Postby thanh-cuibap » Wed Nov 30, 2016 9:37 pm

I think :
Displacer cylinder: diameter : 108mm Displacer diamater: about 106mm is ok !
my stirling : cylinder diameter : 82 mm , displacer diameter : 80.4 mm

Ian S C
Posts: 1970
Joined: Thu Dec 02, 2010 5:15 am
Location: New Zealand

Re: New gamma style engine dimensions - some feedback

Postby Ian S C » Thu Dec 01, 2016 1:32 am

If I were you, I would start with a proven design, have a look at the free plan at the top of the index page. Get that working, then you can design an improved one. Boydhouse has proved that these motors do work, and he has been good enough to put up a free design.
Ian S C

thanh-cuibap
Posts: 147
Joined: Tue Sep 06, 2016 8:09 am
Location: Việt Nam

Re: New gamma style engine dimensions - some feedback

Postby thanh-cuibap » Thu Dec 01, 2016 6:34 am

If I were you, I would start with a proven design, have a look at the free plan at the top of the index page.....
Ian S C


A useful advice !!!!!!!!!!!!


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