OS Engines 15550 50SX-H Hyper Ring 60LH Helicopter Engine FEATURES: Ideal for use in any 50 class helicopter New head design offers improved combustion efficiency for stable hovering and aerobatic flight INCLUDES: One O.S. Max .50 SX-H Helicopter Engine with Hyper Cooling Head, 60LH carburetor (OSMG2469), decal sheet, #8 glow plug, instruction manual REQUIRES: 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix) Starting equipment