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O.S. - OSMG0545 OSM13100 13100 531028018921 4531028018921
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O.S. 35AX ABL w/Muffler
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O.S. 35AX ABL w/Muffler
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Instruction Manuals: Manual 1 (3.1 MB)
Tower Catalog Page: 167

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Tech Notes
This is the O.S. .35AX ABL Model Airplane Engine with E-3080 Muffler.
Ideally suited to a variety of R/C aircraft including trainer, sport types.


Same mounting dimensions as the O.S. .32SX and .25FX
Weighs only 0.35oz (10g) more than the .32SX
Advanced Bi-Metallic Liner. This process uses a double layer of
plating material rather than one thick layer. This helps the metal
to bond to the cylinder and is more durable. Also, the plating
process is more consistent, resulting in a more precise fit between
piston and sleeve for better compression, longer life.
Newly designed E-3080 Power Box muffler generates mild and pleasant
sound and is constructed with an O-ring between the front and
rear body to prevent oil leaking and is fully positionable
21K carburetor with needle valve angled toward rear of engine for
safer adjustments
Ball bearing-supported crankshaft
Two-year limited warranty


One O.S. Max .35AX ABL BB model airplane engine with muffler, #8 glow
plug, two 3x28mm cap head muffler screws, needle valve extension
cable, warranty sheet, decal sheet and illustrated instruction


Fuel containing 5%-20% nitromethane with at least 16% lubricant


Displacement: 0.352 cu in (5.77cc)
Bore: 0.795" (20.2mm)
Stroke: 0.709" (18.0mm)
Practical RPM: 2,500-17,000
Output: 1.3 PS, 1.28 HP @ 16,000
Weight: 12.8oz (363g) with muffler
Recommended Propellers: 10x6, 10x7, 11x6, 12x6 (10x6 for break-in)
Crankshaft Size: 1/4-28

Distance from center of engine to drive hub: 2.1" (53mm)
Distance from center of engine to end of crankshaft: 3.1" (77mm)
Distance/crankshaft center to muffler exhaust outlet: 3.8" (96.2mm)
Height from crankcase bottom to top of cylinder head: 3.02" (76.9mm)
Height/mounting tab to top of cylinder head: 2.4" (61.5mm)
Width including mounting tabs: 1.8" (45mm)
Crankcase width below mounting tabs: 1.2" (30.6mm)
Width between mounting holes same side: 0.59" (15mm)
Width between mounting holes opposite side: 1.5" (38mm)
Diameter of muffler body: 1.2" (32mm)

Needle Settings: High Speed: 2 turns out from fully closed
Low Speed: Flush with carb body then 1/2 turn in

jxs 06/09/08
updt lmm 3/31/09

– 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:

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Accessories Needed
This is the O.S. .35AX ABL Model Airplane Engine with E-3080 Muffler. FEATURES: Same mounting dimensions as O.S. .32SX and .25FX, ABL liner-double layer of plating material, rearward angled needle valve, #8 glow plug, positionable Power Box muffler REQUIRES: 5%-20% nitro fuel, glow starter, field equipment

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