This is the O.S. 55HZ Hyper Ringed Helicopter Engine, equipped with the 40L carburettor. This engine is suited for 3D heli flyers, with the engine cranking out optimum power within minimal amounts of space.

This is the O.S. 55HZ Hyper Ringed Helicopter Engine, equipped with the 40L carburettor. This engine is suited for 3D heli flyers, with the engine cranking out optimum power within minimal amounts of space.