I ain't saying it can't be done, just saying that is what you are up against.
You are up against it all the way. Liability. Warehousing. Manufacturing. Sales.
I think you'd have to have deep pockets to chew all of that sandwich and a benevolent mind towards small aviation.
I think if you need to make $5,000 an engine to keep the lights on then a $20,000 engine that costs you $15,000 to make is feasible but a $10,000 dollar engine that costs you $5,000 to make is not marketable.
D-Motor has the right idea.
A 50hp-ish flathead direct drive would be the least parts count. Going for displacement instead of rpm to create torque the overhead valve contraptions are just extra weight.
Making the tail-boom with iron rich material and wrapped in copper wire will allow inductance while flying between high tension power lines enabling recharging while airborne. Added benefit is pilots will be "wide eyed" and alert.
Having flown aircraft with 144 valve covers and a myriad number of other places to leak oil, I have seen a lot of leaking oil (we all wore black). In my opinion, if you are going to toss extra oil in to the area covered by the valve covers then some thought and a good plan for keeping it from...
Yes, I "think" that these engines are like archipelagos reefed together by a common crankshaft. Each cylinder will have to be adjusted independently. Therefore multiport fuel injection and inputs for the computer off of each cylinder. Even carbureted you will need sensors for each cylinder and...
If as I understand it, these engines require two carburetors each or if one carburetor it is essentially two venturis Siamese'd to a single float bowl then you have to lean each cylinder independently. This isn't much of a deal with a single engine just having 2 mixtures to adjust instead of 1...
I think everything to make them as light as possible and as simple is best route for most. Simple direct drive wood prop diameter and pitch to make 3400rpm to 3500rpm static and cruise around 3200rpm to 3300rpm more or less.
Rolls-Royce Claims Its Latest Electric Airplane Battery Has The World’s Highest Energy Density
The real advantage to a blown aviation engine is to compensate for altitude. Only a small amount of the available extra boost/hp is used at sea level / low altitude and the rest is realized as you go up in altitude to maintain hp in climb / cruise. This way the engine is not over stressed and...