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Stirling engine

Ce site appartient au réseau de sites relatifs aux moteurs à air chaud

Stirling engine: ASAP
by Daniel Lyonnet


- note of assembly
- plans

Note of assembly:

Origin of this engine

Like many fans I saw on Internet the engine of Koichi Hirata named by other “Stirling Prayer Candle”.
I made it, but I encountered some difficulties and I thought that a gamma engine would be easier to manufacture and would be more efficient.
Some vague sketches, a few hours in workshop,and my ASAP (*) worked perfectly: it was in October 1997 and since it always works. Since it underwent a small cure of youth and took the form attached.


Essentially, you need:
- a 33 cl box of beer or any box with a diameter approximately 65 mm.
- chipboard MDF.
- balsa, in thick plate.
- a balloon to be inflated.
- wire, diameter 2 mm.
- small pieces of brass tube, diameter 2/3 mm and 8/9mm.
- a few screws and glue.


- Make the pieces of chassis and the other parts in MDF.
- Assemble the chasis without fixing, at this stage, the support of the wheel.
- Stick the balsa plates to obtain a cylinder 110 mm in length and a diameter from 68 to 70mm. Machine this cylinder to give it a perfectly round shape with a diameter of 63 mm.
- Cut the top of the box of beer.
- Introduce and stick the small brass tubes 2-3 mm in the support of the wheel and the cap of box.
- Form the elements in wire: crankshaft, rods of piston and axis of the displacer.
- Assemble the displacer unit in the box, the stroke of the displacer must be approximately 22 to 25 mm without friction.
- Assemble the piston membrane.
- Install the displacer box on the chassis and fix the piston membrane cylinder on the chassis.
- Position carefully the support of the wheel, the axis of the crankshaft must be at the encounter point of the axis of the displacer box and the axis of the piston membrane cylinder.
- Connect by a plastic tube the brass tubes of 8 mm of the displacer cylinder and the cap of the piston membrane cylinder.

And here, it is finished in theory.

The wheel must run freely with the sensation of a slight compression. All parasitic frictions must be eliminated. Avoid parasitic air intakes. Heat the lower part of the box of beer with a big candle or a small alcohol lamp, wait 30 seconds to a minute to launch the wheel. This engine must be running about 200 to 300 rpm with a very low noise.

(*) A S A P : As Simple As Possible .

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2. Plans :

Plan 1

Plan 2

Plan 3

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This site was created and is maintained by Pierre Gras. Thank you with all the people who contributed their shares: articles, photographs, vidéos, worksheets… The author is opened with any suggestion allowing to improve this site for happiness of everybody. Finally, a big thank you to Robert Stirling !

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