O.S. Engine OSMG1320 FF-320 Flat-Four RC Air Engine  [OSMG1320]

O.S. Engine FF-320
Price:
NZD$3,050.39
Brand:
O.S. Engine
Model:
OSMG1320
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Why Model Pilots Choose the O.S. Engine OSMG1320 FF-320

For active model pilots, the O.S. Engine OSMG1320 FF-320 brings a balance of engineering and practical performance. Its compact flat-four layout helps deliver a calm running character that pairs well with scale and aerobatic mounts.

Balanced Cylinder Pairing to Cut Vibration

The FF-320 uses opposing cylinder pairs that cancel vibration forces, protecting the airframe and onboard electronics. That stability helps reduce pilot workload and keeps radio gear safer during long sessions and aggressive manoeuvres.

Useful Power and RPM Range

Each of the four cylinders displaces 13.3 cc, with bore and stroke matched for usable torque and top end. The practical operating range is about 1,800-8,500 rpm and peak output is roughly 4.1 hp at 8,000 rpm, suitable for a variety of medium to large models.

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

The FF-320 is a great option for club flyers and experienced builders who want the benefits of multi cylinder smoothness without compromising on power.

Will the FF-320 reduce airframe vibration noticeably?

Yes, the flat-four layout lowers transmitted vibration compared to single or twin cylinder engines, which can help avoid cracked fittings and loose components over time.

Is additional mounting reinforcement required?

Standard secure mounts are fine, but check mount hardware and consider vibration-damping washers if your airframe is light or if you use sensitive electronics.

How should I approach tuning and break-in?

Follow a staged break-in at moderate throttle, keep an eye on head temps and adjust needle settings gradually to establish a stable mid and high end as the engine beds in.

What propellers suit different models?

Lighter sport models may favour 18x10 for climb, while larger or heavier models can use up to 22x8 for better static thrust. Match blade pitch to airframe drag.

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