O.S. Max .37 SZ-H Ring Helicopter engine has premium performance for 30-sized machines, from extreme aerobatics to stable hovering. Same mounting pattern and muffler dimensions as the .32 SX-H, for easy installation in most 30-size helis. Re-engineered crankshaft reduces vibration resulting in smooth power across the entire RPM range. 20M carburetor with Idle Needle positioned on same side as Main Needle for easier adjustments. This product includes one O.S. Max .37 SZ-H Ring Helicopter Engine, with #8 Glow Plug, 20M Carburetor, instruction manual and sticker sheet.

Muffler
Heli fuel with 10%-30% nitro content