O.S. Engine OSMG0561 61FX Tunable RC Air Engine  [OSMG0561]

O.S. Engine 61FX
Price:
AUD$342.44
Brand:
O.S. Engine
Model:
OSMG0561
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O.S. Engine OSMG0561 61FX: Tunable power for model pilots

The O.S. Engine 61FX is a solid choice for those who demand a tunable and dependable engine for sport and competitive flying. Built by O.S. Engine, this model is noted for its balance of serviceability and consistent output.

Head design and bearing strength

The semi-square head raises the effective fin area to improve heat rejection, which helps protect the engine during extended flights. Dual ball bearings provide steadier rotation and reduce drivetrain stress under heavy throttle use.

Carburetion and exhaust features

This engine comes with a fine-tune carburetor and a muffler that can change exhaust direction and includes a pressure tap for tuned systems. The remote needle valve can be orientated in two ways to simplify installation and retain the cowl lines of scale models.

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

With thoughtful cooling and installation options, the O.S. Engine 61FX is a dependable engine for pilots who fine tune their setups for performance and appearance.

What is the best way to keep the cooling fins clear?

Avoid packing debris into the cowl intake and periodically clean fins with a soft brush to maintain airflow and cooling efficiency.

How do I tune for consistent idle and throttle response?

Use the remote needle valve for coarse adjustments, then trim the carburetor and check prop selection following the recommended sizes to stabilise idle and midrange response.

Are spare parts readily available for routine service?

Common service items like bearings and carburetor parts are normally available through O.S. Engine dealers and specialist hobby stores.

Which prop range gives a good compromise for sport flying?

For an even mix of acceleration and top end, start with the sport prop sizes listed and adjust based on your aircraft weight and flying style.

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