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Tower Catalog Page:	197
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        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 180°
          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
          Two year limited warranty

INCLUDES: O.S. 72FS-a 4-Stroke Aircraft Engine with muffler, header, type F
            glow plug and manual

REQUIRES: 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

SPECS:    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/11,000 RPM
          Practical RPM: 2,400-12,500
          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
                                       closed
                                                                   jxs 01/20/09
                                                                         ir/jxs
                                                                updt lmm 4/6/09



– If you need more information, use these O.S. resources –

Click Here: Manufacturer's Product Web Page
E-mail: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970


 
Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822  








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