Originally Posted by
Eccentric
Doesn't YS use a supercharger to pressurize the crankcase ? That's not using the engine's piston to 'supercharge' the the intake air/fuel like DP was thinking of. I suggested to DP that using an external supercharger to pressurize the crancase would work well. The YS engines have the supercharger built into the back of the engine, but it is still external (or rather seperate from the piston)...
Take a look at one.
http://www.google.com/patents?id=zcY...age&q=&f=false
http://tech.flygsw.org/ys91.htm
If you guys haven't studied the history of model airplanes engines you are missing out on a lot of interesting designs. Think the RCV concept is original? it was done by a German company in the 70's. Four stroke with reed valved crankcase supercharging and Aspin valve, Webra early 80's, though the engine wasn't strong at all.
I bumped into this today.
http://www.youtube.com/watch?v=eJlE-1dmEak
Greg