91HZ-PS 3D Ring

A proven powerhouse...made better!

The 91HZ Ringed Heli Engine is a major player at heli competitions worldwide, and this newest version takes 3D performance to another level!

• The redesigned regulator is positioned horizontally, working with the PD-08 fuel pump it delivers a steady supply of fuel regardless of the helicopters attitude or demand on the engine.
• The piston and crankshaft are designed to reduce vibration and improve torque over the entire rpm range.
• The narrow profile of the heat sink head helps the 91HZ fit completely inside cooling shrouds without cutting or losing cooling power,and a thermo insulator on the 61B-PII carburetor blocks engine heat to ensure a stable fuel/air mix.
• Includes in-flight needle value adjustment arm.