O.S. 61 FX

This is one of the O.S. FX series of high-performance engines. This series
of engines are used in sport and aerobatic aircraft. The FXs are designed to use a muffler or tuned pipe.
All FX engines are covered under the O.S. Max Two Year Warranty.

1-piece crankcase
Twin ball bearing-supported crankshaft
Schnuerle porting (AKA Schnuerle scavenging)
Advanced Bi-Metallic Liner. This process uses a double layer of plating material, rather than one thicker layer. This helps the metal to bond to the cylinder, and is more durable. Also, the plating process is more consistent, resulting in a more precise fit between piston and sleeve, for better compression, longer life. Side exhaust with muffler with rotatable exhaust outlet New carburetor with remote needle mounted on the backplate of the engine (to keep fingers away from the spinning propeller). Aluminum backplate.


One Expansion style muffler (#E-4010) with screws.
One Assembled engine with carb.
One package illustrated instructions, parts list, and O.S. decal
One O.S. #8 glow plug (OSMG2691)

Displacement: 9.95cc (0.607 cu in) RPM range: 2,000 - 17,000
Bore: 24.0mm (.866") Stroke: 19.6mm (.772")
Horsepower: 1.90 BHP at 16,000 rpm
Weight: 19.4 oz, 23.6 oz w/mufflr
Length: 84mm (3.31") the distance from the backplate to drive washer
Width: 43.0mm (1.69") width of engine neglecting engine mounting flanges
52.0mm (2.05") distance between centers of the mounting holes
Height:100.5mm (3.956") Exhaust port: 29.5mm x 9.0mm rect
Crankshaft Thread Size: 5/16-24 43.8mm btwn exh mounting holes
Props: Tuned Pipe: 12x9, 12x10, 12x11
Sport: 12x6, 12x7, 12x8, 13x6, 13x7
Break-In: 11x7

Fuel with 20% (minimum) lubricant content and 5%-15% Nitromethane
(All the 5%-15% fuels we carry meet these requirements)

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Links a fabricantes

Helices y Motores
Av. 6 de Diciembre 5603 y Louvre, Centro Comercial Jr. Local No. 2 (junto a la Espe)
Telf: 02 224 9054 • Cel: 096 016 925