O.S. Engine OSMG0650 120AX Sport and 3D Airframe Engine  [OSMG0650]

More Displacement in a Familiar Mount

The O.S. Engine 120AX is aimed at sport and 3D flyers who want extra displacement in the same physical space as a .91 engine. That 20% increase helps the model drive larger props and improves vertical performance while staying light.

Lightweight with Improved Cooling

At 21 ounces (650 grams), the 120AX keeps the airframe balanced and reactive. Its angular head design increases metal surface area, which improves heat transfer and supports steady operation under load.

Key Components and Prop Choices

With CCD-standard mounting, the 120AX bolts into many existing .91 positions. It includes a #8 glow plug, a 70D dual-needle carburetor, and an E-5020 Power Box muffler with two adapters. Recommended props include the 14x10 APC for general 3D and a 15x6 APC for quicker sport flying.

For hobbyists upgrading from a .91, the 120AX is a practical way to gain performance without complex airframe changes, delivering a dependable mix of power and cooling.