O.S. 72FS-a 4-Stroke Aircraft Engine, Brand New in Box. OS Factory Code Number
34720
This is the glow powered O.S. 72FS-a 4-Stroke Aircraft Engine.
Features:
- Ideal powerplant for 56 size aircraft-provides extra power for hovering
and 3-D type manuevers, also provides torque for turning larger diameter props
for more realistic scale filght - Broad power band suitable for Scale as well as Sport models
- Same mounting bolt pattern as the FL-70 and FS-70 Ultimate
- New 61N carburetor with extended intake tube eliminates reverse flow tendency
of air/fuel mixture, carb is reversible 180X - Blow-by internal oil system eliminates the need for a crankcase breather
fitting - Adjustable exhaust outlet direction and exhaust port to muffler distance
- Same muffler as the O.S. 81FS-a offers a pleasant exhaust sound with a lower
sound level
Includes:
O.S. 72FS-a 4-Stroke Aircraft Engine with muffler, header, type F glow plug
manual
Specs:
- Displacement: 0.72 cu in (11.79cc)
- Bore: 1.063″ (27.0mm)
- Stroke: 0.822″ (20.6mm)
- Weight: Engine, 16.79oz (476g)
- Silencer & Manifold,1.90oz (54g)
- Power output: 1.2 ps/11,000 RPM
- Practical RPM: 2,400-12,500





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