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Instruction Manuals:	Manual 1
Tower Catalog Page:	195
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        This is the O.S. Max .55 AX Aircraft Engine with Muffler.

FEATURES: Same mounting dimensions as the O.S. Max .46 AX
          Advanced Bi-Metallic Liner process uses a double layer of plating
            material rather than one thick layer. This helps the metal bond to
            the cylinder and makes the plating more durable. Also, the plating
            process is more consistent, resulting in a more precise fit between
            piston and sleeve for better compression and longer life.
          Power Box positionable muffler
          Angular head design offers increased surface area for better cooling
          40J Carburetor with diagonally placed Needle Valve eliminating Remote
            Needle Valve placement
          Two year limited warranty

INCLUDES: O.S. Max 55 AX ABL Aircraft Engine with E-3070 Muffler, 40J
            carburetor, #8 glow plug, illustrated instruction manual, 3.5"
            (90mm) long needle valve extension cable and two 3x35mm muffler
            screws

REQUIRES: Aircraft blend fuel containing 5%-20% Nitromethane with at least 18%
            lubricant

SPECS:    Displacement: .545 cu in (8.93cc)
          Bore:   .906"   (23mm)
          Stroke: .846" (21.5mm)
          Practical RPM: 2,000-17,000
          Power Output: 1.75 ps/16,000 RPM
          Weight: 14.29oz (405g) w/o muffler
                  18.52oz (525g) w/ muffler
          Recommended Props: 12x7-8, 13x6-7
          Crankshaft thread size:1/4-28
          Distance/remote needle to end of crankshaft:          4.7" (119.4mm)
          Distance from center of engine to drive hub:          2.4"  (60.4mm)
          Distance from center of engine to end of crankshaft:  3.4"  (87.6mm)
          Distance/crankshaft center to muffler exhaust outlet: 3.9" (100.5mm)
          Height from crankcase bottom to top of cylinder head: 3.3"  (85.2mm)
          Height/crankshaft center to top of cylinder head:     2.6"  (67.4mm)
          Width including mounting tabs:                 2" (50.8mm)
          Width not including mounting tabs:           1.4" (35.6mm)
          Width between mounting holes same side:      .69" (17.5mm)
          Width between mounting holes opposite side:  1.7" (43.2mm)
          Diameter of muffler body:                    1.5" (38.1mm)
          Angle of muffler in relation to engine:               4°

          High Speed Needle: 2 turns out from fully closed
          Low Speed Neelde:  3mm gap between the needle and spray bar at full
                             throttle (looking down the neck of the carb)

COMMENTS: Available Pitts Mufflers include BISG4046.

                                                                    jxs 9/20/06
                                                            updated jpg 7/18/07
                                                               updt lmm 3/27/09



– 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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