O.S. Engine OSMG0991 110FS-a 4-Stroke Pumped Engine Unit  [OSMG0991]

O.S. Engine 110FS-a 4-Stroke with Pump
Price:
£320.78
Brand:
O.S. Engine
Model:
OSMG0991
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O.S. Engine 110FS-a Pumped Unit Overview

The O.S. Engine OSMG0991 110FS-a 4-Stroke with Pump delivers controllable power and improved cleanliness thanks to its re-lubrication arrangement. The PD-08 pump supports sustained fuel flow when flying inverted or during rapid attitude changes.

Main Advantages of the 110FS-a

Enthusiasts appreciate the 110FS-a for steady torque and less external oiling compared with older configurations. The pump and internal oil circuit together create a dependable package for demanding routines.

Notable Performance Elements

  • Stable Fuel Supply: PD-08 pump reduces the chance of fuel interruption in high-G or inverted maneuvers.
  • Internal Re-lube: Oil is recirculated to limit stains and prolong component life.
  • Propelling Power: The engine produces enough torque for larger props, suiting a range of model types.

Specifications

  • Displacement: 1.10 ci (18.0 cc)
  • Bore: 1.20 in (30.4 mm)
  • Stroke: 0.98 in (24.8 mm)
  • Practical RPM: 2,000-11,000 rpm
  • Power Output: 1.8 hp @ 10,000 rpm
  • Engine Weight: 21.52 oz (610 g)
  • Muffler Weight: 2.3 oz (72 g)
  • Includes: 61P carburetor, F-5040 muffler, PD-08 pump

Overall, the O.S. Engine 110FS-a with Pump is a solid candidate for pilots who need consistent engine behaviour and reduced maintenance fuss during aerobatic flying.

This model is best for pilots with some engine setup experience; its pump and re-lube features aid reliability, but correct installation and tuning are important.
Route lines to avoid sharp bends and protect them from prop wash; secure with clamps and check for air leaks during a ground run before flight.
Spare parts like diaphragms, carburetor parts, and gaskets are commonly stocked by specialist dealers; keep a small parts kit for events.
By recirculating oil, the system helps maintain lubrication where needed and can reduce wear on moving components when maintained correctly.

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