Thermal engine O.S. Engines GF-40 Gasoline 4 Stroke

O.S. GF-40: a powerplant designed for large RC airplanes

The O.S. GF-40 Gasoline Engine was developed to meet the needs of model aircraft enthusiasts looking for a powerful, reliable engine perfectly suited for large radio-controlled airplanes.

With its 4-stroke architecture, it delivers generous torque at low speeds, providing smooth takeoffs, gradual climbs, and particularly realistic flying characteristics.

Its design also prioritizes user comfort. The engine maintains smooth operation throughout its speed range and produces a sound typical of real aviation engines, highly appreciated in warbirds, touring planes, tow planes, and scale models.

An engine designed for long-duration flights

One of the main advantages of the GF-40 lies in its excellent energy efficiency.

Operating on gasoline significantly reduces consumption compared to an equivalent glow engine, while increasing flight endurance.

This low consumption is a benefit for pilots who regularly engage in long flight sessions or use their plane for glider towing.

Since fuel is also easier to find and generally less expensive, the operating cost remains particularly attractive in the long run.

Simplified installation on numerous models

The GF-40 was designed to simplify its integration into existing airframes.

Compatibility with various airplanes

Thanks to its optimized dimensions, it easily fits many large radio-controlled airplanes designed for gasoline engines or powerful 4-stroke glow engines.

Its significant engine torque allows it to effectively power:

• sport planes;
• warbirds;
• aerobatic planes;
• tow planes;
• semi-scale and large-scale models.

This versatility makes it a highly sought-after powerplant for projects requiring power and realism.

Propellers tailored to each flying style

The GF-40 accepts various propeller sizes to adjust the aircraft's behavior to the desired performance.

A larger diameter propeller will enhance traction and realism on a scale model, while a speed-oriented propeller will suit sport and aerobatic planes perfectly.

Particularly smooth operation

The engine's behavior is one of its main qualities.

Accelerations are gradual, throttle responses are crisp, and the engine speed remains particularly stable throughout the flight.

This flexibility facilitates approaches, go-arounds, and slow maneuvers, while instantly providing full power when needed.

After a properly conducted break-in following the manufacturer's recommendations, adjustments remain minimal, reducing the need for interventions between flights.

A mechanically durable design

The GF-40 benefits from all the experience gained by O.S. Engines in designing thermal engines for modeling.

Each component undergoes precise machining to ensure excellent wear resistance and perfectly regular operation. This quality of manufacturing helps preserve the engine's performance for many years when maintained properly.

Efficient cylinder head cooling also helps maintain a stable temperature, even during prolonged use.

A complete equipment ready to be installed

The engine comes with the main accessories necessary for its commissioning.

Box contents

• O.S. GF-40 Gas Engine;
• original muffler;
• electronic ignition module;
• spark plug;
• mounting accessories;
• manufacturer documentation.

This package allows for quick installation on most compatible models.

Why choose the O.S. GF-40?

The GF-40 Gas Engine is aimed at hobbyists looking to benefit from the flexibility of a 4-stroke engine combined with the advantages of gasoline fuel.

Its controlled consumption, high torque, and realistic sound make it particularly suitable for large radio-controlled airplanes.

True to O.S. Engines' quality standards, it offers an excellent balance between performance, reliability, and ease of use.

Whether for a sport plane, a scale model, or a tow plane, the GF-40 is a benchmark for enthusiasts looking for a powerful engine designed to last.