O.S. Engine OSMG0561 61FX Precision RC Airplane Engine  [OSMG0561]

O.S. Engine 61FX
Price:
CAD$332.21
Brand:
O.S. Engine
Model:
OSMG0561
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O.S. Engine OSMG0561 61FX: Trusted power for sport flyers

The O.S. Engine 61FX is built for pilots who need dependable performance in both club flying and competition. This O.S. Engine model delivers a balance of durability and tunability, making it a popular choice for hobbyists who want a proven powerplant.

Improved cooling and long life

Its semi-square head increases fin surface area to boost cooling efficiency, helping the engine stay within safe running temperatures during long flights. The dual ball bearing setup reduces wear under load and contributes to a longer service life when properly maintained.

Flexible tuning and installation

The 61FX includes a high-quality carburetor and a muffler with adjustable exhaust direction plus a built-in pressure tap for tuned setups. The remote needle valve can be mounted in two orientations, which simplifies installation and avoids unnecessary cowl cutting while preserving a neat scale look.

Specifications

  • Displacement: 0.607 cu in
  • Bore: 0.945 in
  • Stroke: 0.866 in
  • Practical RPM: 2,000-17,000
  • Output: 1.90 hp @ 16,000 rpm
  • Weight: 19.4 oz
  • Recommended Props: Tuned Pipe: 12x9, 12x10, 12x11; Sport: 12x6, 12x7, 12x8, 13x6, 13x7

For builders and pilots who value control and longevity, the O.S. Engine 61FX offers a straightforward platform for tuning and reliable operation across a range of sport aircraft.

What mounting considerations should I check before fitting the engine?

Confirm firewall thickness and bolt pattern match, use proper vibration isolation if needed, and ensure cowl clearance for the muffler and remote needle valve positions.

How often should I inspect the bearings and carburetor?

Check bearings and carburetor linkage after every few flights or after any rough landings; clean and lubricate as part of routine maintenance to prevent wear.

Can I use a tuned pipe with this engine?

Yes, the specifications list recommended tuned pipe prop sizes; match prop and muffler setups to achieve the best power band for your airframe.

What propellers work well for sport flying?

For sport setups, try the listed 12x6 to 13x7 props and adjust pitch to suit your aircraft weight and desired throttle response.

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