This is the OS Engines FS-120S-E Surpass Series four stroke ring engine. 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.
- All Surpass engines feature a helix gear-driven camshaft on the front end and dependable updraft carburetor in the back.
- All include glow plug and standard silencer.
- Displacement (cu. in): 1.218
- Bore (in): 1.197
- Stroke (in): 1.085
- RPM range: 2,000-11,000
- Output (hp @ RPM): 1.90 @ 11,000
- Weight (oz): 30.5
- Recommended Props: 13x11, 13x12, 14x10, 14x11, 15x8, 16x6, 16x7, 17x6