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             From 1759 it was many licences for this kind of engines : WOOD, CAYLEY etc.

    Réverend  Robert STIRLING, in 1816, write a licence ; this licence include so many innovations, everybody   consider 1816 as the birthday of hot air engines.

    Up to WW1 a big quantity of engines were build.

    The invention of IC engine as gaz engine anf diesel engine start the declin of Stirling engines.

    Between 1936 and 1975  PHILIPS made a lot of studies and sold licence to company as, Ford, GM, MAN etc..

    Today moderns  STIRLING engines have an efficiency around 42 %.  

    How it work?

       Consider a close pipe, the close end is heated, and the other end is cooled.

In this cylinder it is a "Displacer" like a piston witch allow to let air around it.

Below this displacer, it is a piston well adjust on the cylinder and on the displacer rod.

Sous ce déplaceur se trouve un piston de travail ajusté dans le cylindre et sur la tige du déplaceur.

At the beginning displacer is in upper position, the piston in lowest position.

1 to 2 Compression.  Piston go up and increase the air pressure.

2  to 3 Heating.          Displacer go down, pushing air in hot room, air get more pression.

3 to 4  Power période.The pressure push the oiston and give power.

4 to1 Cooling.             Displacer go up, go down in the cold room. 

STIRLING advantages


The outside combustion is better as an internal combustion. 


It is no exhaust gaz, all air stay inside, means no exhaust noise.

Multi heating

STIRLING engine need only heat, regardless the origine of heat : gaz, gazoline, gazoil, wood, straw etc .. and SUN

Stirling engines to day

It is some applications for modernes STIRLING engines : space, submarines, sawmill in the North.

For the modeller

This kind of engine is very interseting and quit mystérious.

I build around 100 engines in 75 différents types.

If you need more informations please send me a E-mail :





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