>When I fly my plane it is too hot to touch for about 5 minutes after 
>landing ... ;-)
>
>Remember though that  these planes automatically get good 
>air-circulation  when running.
>
>On the other hand, the back-end of the engine remains 
>cool-ish, and does 
>not appear to damage the wood fire-wall, or the fire-wall's epoxy 
>fuel-proof coating.
>
>The issue with the engine is that it has no easy way to adjust the 
>timing ;-) They do have larger scale versions of the same concept used 
>in motorbikes, and UAV's that have the additional features 
>expected from 
>modern engines. See their main page.
>
>In the model RC field, they get a lot of raised eye-brows 
>because of the 
>fairly loud mechanical noise generated by the gearing. Typical RC 
>Engines make an exhaust noise only... the RCV engine's 
>mechanical noise 
>is louder than the exhaust noise.
>
>Rolf


This is realy just a sleeve valve which was invented at the turn of the last century.
http://en.wikipedia.org/wiki/Sleeve_valve

Regards

Mike

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