O.S. Engine OSMG0982 81FS-a Aerobatic Pumped 4-Stroke Engine  [OSMG0982]

O.S. Engine 81FS-a 4-Stroke Pumped Engine
Price:
£308.15
Brand:
O.S. Engine
Model:
OSMG0982
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High-Quality Throttle Response for Aerobatics

Experienced pilots seeking reliable throttle control choose the O.S. Engine 81FS-a with model OSMG0982. The addition of the PD-08 fuel pump helps ensure a continuous fuel supply during extreme attitudes.

Why the Pump Matters in Aerobatic Use

The PD-08 supports stable fuel pressure so the engine remains responsive when lines are tight and inputs are abrupt. That steadiness reduces surprises during competition or practice flights.

Recirculation Lubrication for Neat Operation

The built-in recirculation system routes oil back into the crankcase rather than venting it. This lowers external oiling and makes keeping a scale model clean much easier.

Specifications

  • Displacement: 0.809 ci (13.26 cc)
  • Bore: 1.091 in (27.7 mm)
  • Stroke: 0.866 in (22.0 mm)
  • Practical RPM: 2,200-10,000 rpm
  • Power Output: 1.28 hp @ 10,000 rpm
  • Engine Weight: 20.11 oz (570 g)
  • Muffler Weight: 1.9 oz (54 g)
  • Includes: 61R carburetor, F-5030 muffler, PD-08 pump

The O.S. Engine 81FS-a is well suited to aerobatic pilots who want dependable performance and less oil residue to manage after flying.

Can I fit this engine to a scale model aircraft?

Yes, it is suitable for scale installations where compact power and neat operation are priorities. Check firewall size and cowling clearance before finalising the mount.

How do I prevent fuel vapor lock with the PD-08?

Use secure routing with minimal high points, keep fuel lines in good condition, and ensure clamping is firm to avoid air ingress which can cause vapor issues.

Is additional tuning required for different props?

Yes, changing prop size or pitch affects load and mixture. Re-check needle settings and engine temps after any prop swap to maintain safe running.

What should I inspect after each flying session?

Inspect for secure mounts, fuel leaks, plug condition, and any unusual vibration. Clean any light residue and perform periodic compression and carburetor checks.

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