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

Performance Focused 25FX for Model Aircraft

The O.S. Engine 25FX Non-Ringed with Muffler is a purpose-built glow engine aimed at pilots who fly sport and aerobatic models. It is identified by the part number OSMG0525 and combines compact form with practical features.

Airflow and Bearing Benefits

Schnuerle porting refines the engine's scavenging for cleaner combustion across the rev range. The twin ball bearing crank assembly lowers internal drag and helps maintain consistent running. The non-ringed ABN design reduces reciprocating mass while keeping the assembly robust.

Choice of Exhaust and Propeller Setup

Fit a muffler or a tuned pipe depending on your power and sound preferences. The engine supports prop sizes from roughly 9x5 up to 10x5, offering a useful rpm window from 2,500 to 19,000 for various flying roles.

Dimensions, Weight and Fit

With a length of 75.6mm and a weight of 248g, the side exhaust orientation and compact footprint make this engine straightforward to mount in tighter nacelles.

The O.S. Engine 25FX suits pilots who want a compact, well balanced engine with flexible exhaust choices and dependable running characteristics.