O.S. FS-81A Ringed Four Stroke Glow Engine

In 1936, Shigeo Ogawa set up his original machine-shop, making model steam engines. At the same time the first 1.6 cc O.S. Type-1 miniature gasoline engine was made. 200 production models sold under the name “Pixie” were exported. A short time later the O.S. brand came about. For all these years, OS Engines have been a recognizable name of power, reliability, cutting edge design and quality in the model engine arena. From their much loved “Max” series, to their unique Wankel rotary engine, to the powerful O.S. Speed series engines, they have something for everyone. HobbyKing is proud to be able to bring a wide selection of the latest O.S. Engines to you.

The new O.S. FS-81A is the perfect power upgrade for your 60 size plane while giving you the deeper 4-stroke power and sound. Its classic looks are a flashback to aviation's Golden Age; its power is state-of-the-art.  The 60RA carburetor is equipped with a venturi that reduces the chance of fuel leakage, while also creating more positive air/fuel flow; additionally the new F-5030 Jetstream silencer can be angled to fit most cowled situations while providing a scale like sound that is not too loud.  The result is superbly consistent performance and dependability second to none. With a bolt pattern that matches the original FS-70II engines, this is a perfect drop in replacement that has power, good looks, and reliability wrapped up into one nice little package. Twin ball bearings support the hardened steel crankshaft for the ultimate in efficiency. Fuel for this engine is recommended to use 5~20% nitro, with at least 18% oil content by volume.

Features:
• Mounts in the same bolt pattern as the FS-70SII
• The specially designed lubrication system eliminates the need for crankcase ventilation
• Rubber seal on the muffler's multi-positional manifold helps prevent oil leakage
• Balanced, optimized crankshaft for vibration control and improved performance
• 60RA carburetor is equipped with a venturi that reduces the chance of fuel leaking out onto the cowl, while also creating more positive air/fuel flow
• Carburetor is positioned on the center line for easy installation in a variety of models
• Ringed piston increased power and reliability

Specs:
Displacement: 0.809 cu in (13.26 cc)
Bore: 1.091 in (27.7 mm)
Stroke: 0.866 in (22.0 mm)
Practical rpm range: 2,200-10,000
Output: 1.28 hp @ 11,000 rpm
Weight w/muffler: 20.11 oz (570 g)

Includes:
#F Glow Plug
F-5030 Jetstream Silencer