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O.S. - OSMG0877 OSM34720 34720 531028019638 4531028019638
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O.S. FS72-a Ringed 4-Stroke
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O.S. FS72-a Ringed 4-Stroke
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Instruction Manuals: Manual 1 (4.3 MB)
Tower Catalog Page: 175

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Tech Notes
This is the glow powered O.S. FS72-a 4-Stroke Aircraft Engine.


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 180
Blow-by internal oil system eliminates the need for a crankcase
breather fitting
Adjustable exhaust outlet direction and exhaust port to muffler
Same muffler as the O.S. 81FS-a offers a pleasant exhaust sound with
a lower sound level
Two year limited warranty


O.S. FS72-a 4-Stroke Aircraft Engine with muffler, header, type F
glow plug and manual


Fuel: 10%-20% nitromethane with 18% lubricant. Synthetic, castor, or
a synthetic/castor lubricant blend may be used.
NOTE: Certain four-cycle fuels cannot be used due to low oil content.
However, SOME four-cycle fuels such as the Wildcat 4-Cycle 15%
(CATP9109) may be used due to its 18% oil content.
When choosing fuels for this engine, be sure to select a fuel with
at least an 18% lubricant content.
Propeller: Sport and aerobatic scale 12x7, 13x6-8, 14x6-7


Displacement: 0.72 cu in (11.79cc)
Bore: 1.063" (27.0mm)
Stroke: 0.822" (20.6mm)
Weight: Engine, 16.79oz (476g)
with Silencer & Manifold, 18.7oz (530g)
Power output: 1.2 PS, 1.18 HP/11,000 RPM
Practical RPM: 2,400-12,500
Crankshaft Thread Size: 1/4 x 28
Height from Bottom of Mounting Tab to Top of Crankcase: 3.5" (90mm)
Width of Crankcase below Mounting Tabs: 1.4" (36mm)
Center of Mounting Holes Same Side: .79" (20mm)
Center of Mounting Holes Opposite Side: 1.8" (45mm)
Center of Front Mounting Hole to Drive Washer: 1.9" (49.5mm)
Center of Rear Mounting Hole to Drive Washer: 2.7" (69.5mm)
Center of Crankcase to Center of Needle Assembly: 0.83" (21.3mm)
Center of Crankcase to Outer Edge of Needle Assembly: 1.3" (33.7mm)
Muffler Angle in Relation to Engine: 11

Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
Mixture Control (low speed): 2 turns out from fully

jxs 01/20/09
updt lmm 4/6/09
updt jxs 01/13/11
updt jml 02.04.11

– If you need more information, use these O.S. resources –
Click Here: Manufacturer's Product Web Page
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:

Click here for Units of Measure Conversion Calculators

Accessories Needed
This is the glow powered O.S. FS72-a 4-Stroke Aircraft Engine. FEATURES: Ideal for 56 size aircraft, same mounting pattern as FL-70 & FS-70U F5030 muffler w/rubber O-ring in multi position manufold, type F glow plug REQUIRES: Fuel-10-20% nitro w/18% lubricant, prop, field equipment

Accessories for the O.S. FS72-a Ringed 4-Stroke

Primary Accessories     Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
 LXHY34 Top Flite 13x6 Power Point Propeller
Qty Discount Available
4.99   In Stock
 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
Qty Discount Available
9.19   In Stock
Subtotal for this Group of Accessories: 14.18  
Click to Order all items listed in this Group of Accessories    Buy This group of Accessories

Primary Accessories     Optional Accessories

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