The Tradition Continues...

Everyone knows about how the FS56-a, FS81-a and FS110-a deliver superior 4-stroke power and performance, as well as how they've revolutionized the engine industry. Now, O.S. has filled in the missing link with the release of the FS72-a. Pilots of .60-sized aircraft can now enjoy such FS-a benefits as a blow-by internal oil system. It eliminates the need for a crankcase and re-circulates excess oil throughout the engine. No fuss...No muss...Just a first-rate engine that sets new standards while continuing traditional O.S. quality. The FS72-a Four-Stroke – only from O.S.

  • Specifications
  • Exploded Views
  • Parts Listing
  • Accessories
Stock Number: OSMG0877
Displacement: 0.72 cu in (11.8 cc)
Bore: 1.063 in (27 mm)
Stroke: 0.822 in (20.6 mm)
Practical rpm range: 2,400-12,500
Output: 1.18 hp @ 11,000 rpm
Weight w/o muffler: 16.79 oz (476 g)
Weight w/muffler: 18.7 oz (530 g)
Includes: 61N carburetor, F-5030 muffler & F glow plug

Primary Accessories

Stock Number Mfr Number Product Description Quantity Needed
 TOPQ5155   TOPQ5155  Top Flite 13x6 Power Point Propeller 1

Field Equipment

Stock Number Mfr Number Product Description Quantity Needed

Optional Accessories

Stock Number Mfr Number Product Description Quantity Needed
 DTXR0185   DTXR0185  Duratrax Engine Tuning Screwdriver 1
 DTXR0187   DTXR0187  Duratrax Engine Tuning Tool 1
 OSMG2624   72109500  O.S. Exhaust Manifold Inside FS-70/FS-91 1
 OSMG2625   72109600  O.S. Exhaust Manifold Outside FS-70/FS-91 1
 OSMG2672   72108110  O.S. Flex Pipe FS70-91S/70U/FL70/FS81A 240mm 1111B 1
 OSMG2684   72108100  O.S. Flex FS70-91S/70U/FL70/FS/81A 120mm 1111A 1
 OSMG2687   72108120  O.S. Flex FS70-91S/70U/FL70/FS81A 170mm 1111C 1
 OSMG2689   72108130  O.S. Flex FS70-91S/70U/FL70/FS81A 330mm 1111D 1
 OSMG2805   71905010  O.S. Radial Mount 72FS-a 1
 OSMG5870   71531000  O.S. Bubbleless Clunk 1
 OSMG5872   72403050  O.S. Super Can Filter Large 1
 OSMG6334   72200060  O.S. 4-Stroke Valve Adjustment Kit 1
 OSMG7290   72200080  O.S. Needle Ext Cable FR5 300 1
 OSMR2976   71521000  O.S. Long Socket Wrench With Plug Grip 1
 PAAP1453   PT31  Pacer Zap After-Run Engine Oil 1 oz 1
 TOPQ5160   TOPQ5160  Top Flite 13x8 Power Point Propeller 1
 TOPQ5170   TOPQ5170  Top Flite 14x6 Power Point Propeller 1