I find this setup quiet interesting (yamaha engine)

[adrian222]

Yamaha RX1 Engines

 

Mohawk Aero Craft Mohawk Aero GT4 Engine Engines & Gyrocopters

 

 

[geoffreywh]

That's a lot of HP for 10 large

 

 

[onetrack]

That little engine is pulling 10,500 RPM to make that 150HP. That's going to make for a noisy ride, even if it is cheap.

 

 

[Gyuri]

How about the cost of gearbox and it's weight and liability?