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

Compact Powerplant for Sport and Aerobatics

The O.S. Engine 25FX Non-Ringed with Muffler is a precision-built glow motor for RC pilots who need reliable thrust. This unit, sold under part number OSMG0525, combines a durable construction with features tailored to sport and aerobatic models.

Porting, Bearings and Engine Layout

Schnuerle porting improves scavenging to boost combustion efficiency, while the twin ball bearing crankshaft support reduces friction and helps maintain smooth rpm. The non-ringed ABN cylinder design keeps weight low without sacrificing robustness.

Flexible Exhaust and Prop Options

The 25FX accepts either a muffler or a tuned pipe, so you can pick the setup that matches your aircraft and flying style. Typical prop choices range from 9x5 up to 10x5, giving a practical operating range from 2,500 to 19,000 RPM.

Size, Weight and Installation Notes

With an overall length of 75.6mm and a weight of 248g, the side exhaust layout simplifies mounting in compact cowlings and helps keep the centre of gravity tidy.

The O.S. Engine 25FX gives a straightforward package for club fliers and sport pilots who value compact size, dependable running and a variety of tuning choices.