O.S. Engine OSMG0890 FS-91 Surpass II with Pump - Durable Aeroplane Engine  [OSMG0890]

O.S. Engine FS-91 Surpass II with Pump
Price:
AUD$607.55
Brand:
O.S. Engine
Model:
OSMG0890
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Compact performance notes for the FS-91 Surpass II

The O.S. Engine FS-91 Surpass II with Pump is engineered to provide steady, usable power while keeping service intervals manageable. It suits pilots who need a resilient engine for frequent flying sessions.

Pump system for consistent fuel delivery

Incorporating a regulating pump normally seen on larger engines, the FS-91 improves fuel delivery under rapid throttle changes, resulting in more consistent combustion and predictable thrust.

Plated components and sealed bearing for longevity

To extend life, the crankshaft, camshaft and piston ring are plated and the rear bearing is rubber sealed and greased, which helps resist corrosion from fuel residues and moisture.

Carburetor orientation options for neat installations

The reversible carburetor allows you to choose the needle valve side that best suits your airframe layout, simplifying plumbing and access for routine adjustments.

Large-volume muffler for reduced exhaust noise

A big capacity muffler helps keep sound levels down while retaining the engine's performance across the practical RPM band.

Specifications

  • Displacement: 0.912 cu in (14.95 cc)
  • Bore: 1.091 in (27.7 mm)
  • Stroke: 0.976 in (24.8 mm)
  • Practical RPM Range: 2,000-12,000
  • Output: 1.6 hp @ 11,000 rpm
  • Weight with Muffler & Manifold: 23.9 oz (678 g)
  • Weight without Muffler & Manifold: 22.2 oz (630 g)
  • Recommended Props: Stunt: 11x10, 11x11, 12x9.5, 12x10, 12x11; Scale: 13.5x8, 14x7, 15x6, 16x6, 12x8 3-blade, 12.5x7 3-blade

For regular flyers looking for a low maintenance engine with flexible mounting and tuning options, the FS-91 Surpass II with Pump is a solid candidate.

What servicing should I do after each flying day?

After flying, remove excess oil and fuel residues, check mounting bolts and inspect the muffler and manifold for leaks; store the engine dry to reduce corrosion risk.

Is the pump system adjustable?

The pump itself regulates fuel feed rather than being a user tuned setting; tuning is performed via the carburetor needles to suit your aircraft and propeller choice.

What mounting hardware should I use?

Use grade-appropriate bolts and a firm firewall; lock washers or thread lock are recommended to keep the engine secure through high vibration flights.

Are spare parts readily available?

O.S. Engine spare parts like gaskets and bearings are commonly stocked by hobby shops and online retailers, which helps keep repair downtime to a minimum.

Which prop range works best for scale models?

For scale models try props in the 13.5x8 to 16x6 range to maintain a realistic look and efficient cruise performance; confirm peak RPM on a tachometer.

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