The OS FS-120 Surpass (original Series I) is a classic 1.20 cubic-inch four-stroke RC airplane engine. It predates both the Surpass II, Surpass III, and the pumped (FI/SP) versions.
Type: 4-stroke glow ignition.
Displacement: 19.96 cc (1.218 cu in).
Bore: 30.4 mm.
Stroke: 27.5 mm.
Practical RPM: 2,000 – 11,000
RPM.Output: 1.9 bhp at 11,000 RPM.
Weight: 935 grams (without silencer)
Recommended Fuel: 5% to 15% nitromethane with at least 18% lubricant.
Synthetic/Castor Blend: Best for protecting the flat-tappet camshaft.
Sport Propellers: 14×8, 15×6, 15×8.Scale Propellers: 16×6, 18×5, 18×6.
