O. S. 72FS-a 4-stroke Engine

Model Airplane News - RC Airplane News | O. S. 72FS-a 4-stroke Engine

Excellent power that runs cleaner!


A win-win engine for any pilot! The O. S. 72FS-a 4-Stroke offers more power in the same footprint as a 70-size – and with an ingenious oil system that boosts performance and virtually eliminates clean-up.


  • Precision-machined, bar stock piston, crankshaft, camshaft, conrod and rocker arms
  • Durable, heat-treated parts
  • Stronger wrist pin, conrod and valve assembly designs to minimize wear and extend life
  • Dual bearings, factory-set valves and idle for shorter setup and break-in
  • Reversible carb and narrower camshaft for installation ease
  • Compact mufflers can be moved in or out and rotated 360°, for more in-cowl options with fewer mods
  • Tighter tolerances and ratchet springs help hold settings longer
  • O-ring seals on carbs eliminate fuel/air leaks



Displacement: .72 cu in. (11.79 cc)

Bore: 1.063 in. (27 mm)

Stroke: 0.811 in. (20.6 mm)

Practical rpm range: 2,400-12,500

Output: 1.2hp at 11,000rpm

Weight w/o muffler: 16.8 oz. (476 g)

Includes: 61N carburetor, F-5030 muffler, Type F glow plug


OSMG0877     72FS-a 4-Stroke Engine           Retail: $549.99   Street: $339.99




For more information please visit:  www.osengines.com

Updated: April 15, 2009 — 10:00 AM
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