O.S. Engine OSMG1320 FF-320 Four Cylinder Model Engine  [OSMG1320]

O.S. Engine FF-320
Price:
£1,343.99
Brand:
O.S. Engine
Model:
OSMG1320
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Flat-Four Engineering in the O.S. Engine OSMG1320 FF-320

Model flyers who demand refined running will appreciate the O.S. Engine OSMG1320 FF-320. Its flat-four configuration emphasises smooth delivery and reduced mechanical vibration for precision flying.

Opposed Cylinder Benefits for Airframes

The engine's opposing cylinders significantly lower transmitted vibration, helping to protect fragile radio gear and wooden structures. This design choice makes the FF-320 a sensible option for pilots focused on longevity and consistent performance.

Notable Performance Figures

The FF-320 provides 13.3 cc per cylinder across four units, with a tuned bore and stroke for broad usability. Expect a practical rev range of 1,800-8,500 rpm and an output near 4.1 hp at 8,000 rpm, suitable for a wide array of medium and larger scale aircraft.

Specifications

  • Displacement: 0.809 cu in (13.3 cc) x 4
  • Bore: 1.091 in (28 mm)
  • Stroke: 0.866 in (22 mm)
  • Practical RPM: 1,800-8,500
  • Output: 4.1 hp @ 8,000 rpm
  • Weight: 77.3 oz (2,190 g)
  • Includes: Glow plugs, mount

For experienced modellers and contest pilots, the FF-320 offers a reliable, low vibration powerplant that helps preserve both airframe and on-board equipment.

The engine runs on standard glow fuel used in RC aircraft. Use a quality fuel and keep the tank and lines clean for stable running.
Installation is straightforward if you follow mount alignment and cooling clearance practices. Larger multi cylinder engines need careful firewall reinforcement and balanced props.
Use progressive break-in at moderate throttle, monitor headings for oiling and heat, and gradually open the needles to reach stable mid and top end settings.
Recommended propellers typically range from 18x10 to 22x8, chosen according to aircraft drag and performance goals.

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