O.S. Engine OSMG0525 25FX Non-Ring ABN Engine with Muffler  [OSMG0525]

High Efficiency 25FX for RC Airframes

The O.S. Engine 25FX Non-Ringed with Muffler delivers a compact, engineered solution for pilots who fly sport and aerobatic models. This model carries the part number OSMG0525 and is built to offer steady performance in a small package.

Combustion and Bearing Design

Schnuerle porting enhances cylinder scavenging and fuel burn, increasing efficiency through the rev range. Twin ball bearings support the crank for reduced friction and improved smoothness. The ABN non-ringed cylinder lowers rotating mass while keeping structural integrity.

Exhaust and Propeller Flexibility

The side exhaust accepts either a muffler or tuned pipe arrangement to suit sound and power preferences. Practical propeller selections run from 9x5 to 10x5, enabling a wide RPM window from about 2,500 up to 19,000.

Compact Dimensions and Mounting

At 75.6mm long and 248g in weight, the engine fits tight cowls and helps maintain a compact centre of gravity. The side exhaust location assists with simple routing and installation.

For pilots seeking a small but capable powerplant, the O.S. Engine 25FX balances light weight and dependable performance for varied flying tasks.