O.S. Engine OSMG1250 FT-300 1/4 Scale Flat Twin Engine  [OSMG1250]

O.S. Engine FT-300
Price:
AUD$1,950.50
Brand:
O.S. Engine
Model:
OSMG1250
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Scale-Accurate Performance from the O.S. Engine FT-300

Hobbyists focused on scale realism will value the O.S. Engine FT-300 for its authentic sound and refined delivery. As the largest flat twin O.S. offers in this series, the FT-300 is tailored to lift quarter-scale models while keeping installation straightforward.

Core engineering and measured output

The FT-300 showcases O.S. Engine workmanship with clear technical numbers: 1.488 x 2 inch displacement, 1.323 inch bore and a rated 4.0 hp at 7,000 rpm. Its recommended working range from 1,800 to 9,000 rpm and 64.5 oz weight support a wide selection of 1/4 scale airframe designs.

Operational benefits of the opposed twin layout

The horizontally opposed twin reduces engine shake and improves smoothness across throttle transitions, which enhances handling and reduces wear on linkages. The engine ships with a glow plug, firewall mount and a dedicated prop locknut system for reliable installation.

Specifications

  • Displacement: 1.488 x 2 in
  • Bore: 1.323 in
  • Stroke: 1.083 in
  • Practical RPM: 1,800-9,000 rpm
  • Power Output: 4.0 hp @ 7,000 rpm
  • Engine Weight: 64.5 oz

Experienced modellers who want a balance of power, realism and manageable weight will find the O.S. Engine FT-300 a practical option for 1/4 scale installations.

How difficult is it to install the FT-300?

Installation is straightforward for those familiar with glow engines; the supplied firewall mount and locknut assembly help, but check cowl clearances and spinner fit before final assembly.

Are there common upgrades for this engine?

Common improvements include quality propellers tuned to your airframe, reinforced mounting hardware for aerobatic use and a reliable glow ignition system for consistent starts.

What should I check after first flights?

After initial runs, re-torque mounting bolts, inspect the glow plug condition, confirm fuel line integrity and look for any loosening in the prop locknut system to ensure ongoing reliability.

Is the FT-300 noisy compared to other options?

It produces a scale-like tone typical of opposed twins, generally smoother and less harsh than many single cylinder gasoline engines, though overall noise depends on propeller choice and cowling.

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