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

O.S. Engine 110FS-a 4-Stroke with Pump
Price:
CAD$597.97
Brand:
O.S. Engine
Model:
OSMG0991
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O.S. Engine OSMG0991 110FS-a Performance Overview

Built for hobbyists who value precise throttle control and reliable output, the O.S. Engine OSMG0991 110FS-a 4-Stroke with Pump combines solid power with user-friendly maintenance. The fitted PD-08 pump maintains steady fuel pressure through inverted flight and aggressive aerobatic sequences.

What Makes the O.S. Engine 110FS-a Stand Out?

Modelers trust the O.S. Engine 110FS-a for its strong torque and relatively low oil residue compared to older designs. The pump-equipped layout supports continuous fuel flow, which helps keep engine response predictable under demanding flight profiles.

Key Engineering Features

  • Pump Performance: The PD-08 pump delivers consistent fuel feed, essential for attitude changes and sustained vertical runs.
  • Re-lubrication Design: Oil is recirculated to limit external mess and extend the life of moving parts.
  • Torque Capacity: Engine torque lets you swing larger propellers, making it compatible with a range of airframes.

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

This O.S. Engine 110FS-a with Pump is a flexible option for pilots who fly aerobatics or require steady high-power performance, offering straightforward servicing and durable components.

Is this engine appropriate for a pilot stepping up to aerobatics?

Yes, the O.S. Engine OSMG0991 110FS-a can suit pilots progressing into aerobatics because of its steady fuel delivery and predictable throttle response, though some setup experience helps.

How often should I service the PD-08 pump?

Inspect the pump at regular intervals and clean or replace diaphragms if you notice inconsistent fuel flow; a quick check after a few flights helps avoid in-flight lean conditions.

What propellers work best with this engine?

The engine handles larger diameter, lower pitch props for strong static thrust; choose a prop that keeps peak rpm near the recommended range while matching your airframe weight.

Which oil is recommended for the re-lubrication system?

Use a high-quality model engine oil compatible with re-lubrication setups and follow the manufacturer's mix ratios to protect internal parts and reduce deposits.

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