O.S. Engine OSMG0845 FS-40S 4-Stroke Aeromodelling Engine  [OSMG0845]

O.S. Engine OSMG0845 FS-40S - Four-Stroke Choice for Scale and Sport Models

Model aviators who prioritise steady, controllable power will find the FS-40S well suited to a variety of airframes. As a Surpass Series engine, it is optimised to accept larger diameter props and provide dependable thrust for different flying styles.

Surpass Series Construction

The Surpass Series employs a helix gear-driven camshaft at the front and an updraft carburettor at the rear to promote even mixture and reliable combustion. The FS-40S is supplied with a glow plug and a standard silencer to ease initial setup and reduce exhaust noise during operation.

RPM Range and Mechanical Data

Specifications include 0.396 cu in displacement, a 0.835 in bore and 0.724 in stroke. The engine runs effectively from about 2,200 to 12,000 rpm, develops roughly 0.65 hp at 12,000 rpm and weighs around 12.5 ounces.

The FS-40S offers a sensible balance of weight and usable power for modellers at different skill levels. With routine checks and correct prop selection it will perform reliably in many model types.