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O.S. - OSMG0991 OSM35420 35420 531028020108 4531028020108
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O.S. 110FS-a Alpha Series Ringed 4-Stroke w/Pump
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O.S. 110FS-a Alpha Series Ringed 4-Stroke w/Pump
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Instruction Manuals: Manual 1 (3.4 MB)

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Tech Notes
This is the O.S. Engines FS110-a P 4-Stroke Aircraft Engine
with Pump and 5040 Silencer.


Muffler adjusts in or out with threaded header pipe and rotates a
full 360 for more mounting options with fewer modifications
Broad power band suitable for scale as well as sport models
61P carburetor with integrated pump regulator to ensure powerful
flights and stable fuel delivery regardless of model attitude and
fuel level change
Two year limited warranty through manufacturer beginning at date of


O.S. Engines FS110-a P 4-Stroke Engine, muffler, 61P carb w/pump,
header pipe, F glow plug, instruction manual and needle valve
extension cable


Fuel: 5-20% nitro content with at least 18% lubricant content
Propeller: Sport & Aerobatic 13 x 9-11, 14 x 8-10
Scale 15 x 8, 16 x 8
Electric starter and other field equipment


Displacement: 1.10cu in (18.0cc)
Bore: 1.20" (30.4mm)
Stroke: 0.98" (24.8mm)
Practical RPM: 2,000 - 11,000
Power Output: 1.8 PS, 1.77 HP /10,000 RPM
Weight: 21.5oz (610g)
Muffler Weight: 2.5oz (72g)
Crankshaft Size: 5/16-24
Height from Mounting Tab/top of Cylinder Head: 4.1" (103.8mm)
Height from Crankcase Bottom/top of Cylinder Head: 4.9" (125.4mm)
Width at Mounting Tabs: 2.4" (61mm)
Width of Crankcase Below Mounting Tabs: 1.7" (42.6mm)
Length from Carb to Prop Washer: 4.5" (114.5mm)
Length from center of Crankcase to Prop Washer: 2.6" (66.5mm)
Length from center of Crankcase to center of Carb: 1.8" (46.3mm)
Needle Valve Setting: High Speed: 1/1/2 - 2 turns from fully closed
Mixture Control (low speed): Factory set, do not adjust

jxs 09/01/09

– If you need more information, use these O.S. resources –
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
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Accessories Needed
This is the O.S. Engines FS110-a P 4-Stroke Aircraft Engine W/5040 Silencer. FEATURES: Fully adjustable muffler requires less modifications to aircraft, pump system for constant fuel delivery, F glow plug, needle valve extension cable REQUIRES: 5-20% nitro content w/at least 18% lubricant, field equipment

Accessories for the O.S. 110FS-a Alpha Series Ringed 4-Stroke w/Pump

Primary Accessories     Optional Accessories
  Special Stock Number Product Description Parts Saver Eligible Tower's
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 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
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9.19   In Stock
Subtotal for this Group of Accessories: 9.19  

Primary Accessories     Optional Accessories

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