Does that include the governor, and the weight of a 60 lb c/s prop? Seriously, if it can be done for that price by someone who's *not* a tool builder and in a reasonable amount of time, I'd be interested, even if it's fixed pitch. Cost? And there's still the issue of handling 200-230 hp with a relatively small dia prop. Pushers force the small dia anyway, but a requirement for extra blades and a low speed efficiency hit are going to be built in. The weight (& expense) of the c/s prop & governor could be a deal killer for a lot of airframes; one of the ways to get a V8 to work on an airframe designed for air cooling is to keep the weight down with a wood/composite prop. There was a group effort in the rotary engine community about a decade ago to develop an electric V/P composite prop, but IIRC, disagreements about intellectual property rights killed it before it got to testing stage.