.91 SZ-H PH-Hyper Ringed Heli Engine w/Pump

The new power plant of choice for FAI competitors!

O.S. has enhanced the World Championship-winning performance of the 91SZ-H Ringed heli engine by equipping the PH-Hyper version with a pump, which delivers consistent fuel pressure, regardless of the heli's attitude. Pilots will still enjoy all of the 91SZ-H's original features, including new intake porting, a new carb and a redesigned crankcase that offers better support for the clutch and rotor.