O.S. Engine OSMG0930 FS-120S-E Precision 4-Stroke Engine  [OSMG0930]

O.S. Engine FS-120S-E
Price:
£346.02
Brand:
O.S. Engine
Model:
OSMG0930
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Precision 4-Stroke Design from O.S. Engine FS-120S-E

Serious RC pilots will value the FS-120S-E for its engineering focus on steady output and longevity. As a member of the Surpass Series, it delivers dependable power for models requiring a reliable 4-stroke installation.

Helix Gear Camshaft Benefits

The front-mounted helix gear-driven camshaft offers improved timing stability and quieter mechanical operation. Matching this with a rear updraft carburetor helps maintain consistent fuel delivery for clean combustion throughout the rpm band.

Adaptable Propeller Options

With support for an extensive range of prop sizes, the FS-120S-E lets builders balance climb, cruise, and static thrust to suit their aircraft. Recommended props include sizes from 13x11 through 17x6 to meet varied setup goals.

Specifications

  • Displacement: 1.218 cu in
  • Bore: 1.197 in
  • Stroke: 1.085 in
  • Practical RPM: 2,200-11,000
  • Output: 1.90 hp @ 11,000 rpm
  • Weight: 30.5 oz
  • Recommended Props: 13x11, 13x12, 14x10, 14x11, 15x8, 16x6, 16x7, 17x6

The FS-120S-E is aimed at knowledgeable pilots who want a proven 4-stroke powerplant that can be tuned to different flight requirements.

What makes this model easier to tune than others?

The combination of a helix gear-driven camshaft and a stable updraft carburetor gives predictable behaviour during needle adjustments, making tuning more straightforward for experienced tuners.

How should I match propeller to airframe weight?

Select a prop that keeps the engine within its practical rpm range while delivering the thrust needed for safe climb and cruise. Use the recommended sizes as a starting point and adjust based on flight testing.

Does the engine require special mounting hardware?

Standard firewall mounting procedures apply; ensure secure fastenings and correct spacing to prevent stress on the crankcase and to minimise vibration transfer to the airframe.

What routine checks extend service life?

Regular checks of the carburetor, mounting bolts, prop balance and a consistent post-run oil routine will help keep the engine running well and reduce wear over time.

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