O.S. Engines

FS-120 III Surpass Ringed 4-Stroke w/Pump

  • High torque for spinning bigger props.
  • Quieter, more realistic airplane sound.
  • Generous with power—stingy with fuel.

Bore: 30.4mm (1.20") Stroke: 27.5mm (1.08") Power Output: 2.1 BHP at 12,000 rpm Practical rpm Range: 2,000 - 12,000 rpm Weight Without Muffler: 32.5oz (921g) Weight With Muffler: 35.3oz (1000g) Recommended Props: 14x9, 14x10, 14x11, 15x8, 15x9, 15x10, 16x6