O.S. FS-91S II Four Stroke - SECOND HAND - NEW UNRUN

O.S. FS-91S II Four Stroke - SECOND HAND - NEW UN-RUN

Please not the engine has been fixed to a mount - washer marks on the mounting lugs - in original box which is slightly tired and no manual.

This is the OS Engines Surpass Series FS-91S-II four stroke ring engine, with 60P carburettor.  O.S. developed the Surpass Series of 4-stroke engines for discerning fliers who demand more power. Able to swing larger props and supply more usable horsepower, Surpass 4-strokes provide the best performance for your plane, regardless of scale or flying style.

Features:

• All Surpass engines feature a helix gear-driven camshaft on the front end and dependable updraft carburettor in the back.
• All include glow plug and standard silencer.

Specifications:

• Displacement (in): 0.912
• Bore (in): 1.091
• Stroke (in): 0.976
• RPM range: 2000-12,000
• Output (hp @ RPM): 1.60 @ 11,000
• Weight (oz): 22.9

Recommended Props:

• Stunt: 11x10, 11x11, 12x9.5, 12x10, 12x11
• Scale: 13.5x8, 14x7, 15x6, 16x6
• 3-Blade: 12x8, 12.5x7