Skytrax makes aero conversion gearboxes for the Yamaha Nytro 3cyl engine. They are based in the USA. The gearbox has a variety of reduction ratios and terminates in an SAE-1 size propeller flange. Its layout is 3 cylinder inline with a gear reduction. It includes turbo and fuel injection. This engine is relatively new to the market.
The gearbox design allows for the use of the Airmaster minislipring mounted on the rear of the gearbox.
Airmaster offers a limited range of propellers for this engine, please enquire.