YS 110FZ supercharged?
 

I bought this ultimate biplane about 15 years ago. Never flown. I am getting back to the hobby, so figured I better give it a once over. I was told it was a ys110. Well, it is... but is it supercharged? driven off the crankshaft directly? And the big square box on the head.. is that just an air box?
It is a DPM Ultimate 120 size piece.
It should fly it's ass off????
Thanks
Wags

It is super charged by a combination of the pumping action in the crankcase and a rotary valve that lets air in but not out. It will make 30 to 35% more power than a non super charged engine of the same displacement. The box is called a plenum. On the smaller YS .53 the fat intake tube serves as part of the plenum. In both engines the rocker box is also part of the plenum system.

Roger. Thanks. It is not a "mechanical" supercharger.. as in roots style like the OS was.

This Webra T-4 87 used crankcase super charging but used one way valves on each side of the engine. The standard T-4 87 had plates over the crankcase ports.