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O.S. - OSMG0981 OSM34810 34810 531028018686 4531028018686
Manufacturer Stock#
34810
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O.S. 81FS-a Ringed 4-Stroke w/Muffler
 
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O.S. 81FS-a Ringed 4-Stroke w/Muffler
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Instruction Manuals: Manual 1 (1.7 MB)
Tower Catalog Page: 169

Stock Number
LXSZW5
Retail Price
599.99
Tower's Low Price
$369.99
Stock Status
On Order

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Tech Notes
 
NOTES FROM OUR TECH DEPARTMENT
This is the glow powered O.S. FS81-a 4-Stroke Aircraft Engine.

FEATURES

Same mounting dimensions as the O.S. Max FS-70 Surpass
Ideal fit for 60 size planes
Specially designed lubrication system eliminates need for crankcase
ventilation
60RA carburetor
F5030 muffler with rubber O-ring in multi position manifold to help
prevent oil leakage

INCLUDES

O.S. FS81-a 4-Stroke Aircraft Engine, carburetor, muffler, header,
type F glow plug, manual

REQUIREMENTS

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 13x7-9 or 14x6-7

SPECIFICATIONS

Displacement: 0.809 cu in (13.26cc)
Bore: 1.091" (27.7mm)
Stroke: .866" (22mm)
Weight with Muffler: 20.11oz (570g)
Practical RPM Range: 2200-10,000
Output: 1.3 PS, 1.28 HP @ 11,000 RPM
Height from Bottom of Mounting Tab/Top of Rocker Cover: 3.8" (97mm)
Width of Crankcase below Mounting Tabs: 1.6" (40mm)
Center of Mounting Holes Same Side: .83" (21mm)
Center of Mounting Holes Opposite Side: 2" (50.8mm)
Center of Front Mounting Hole to Prop Washer: 2.2" (55.5mm)
Center of Rear Mounting Hole to Prop Washer: 3" (76.2mm)
Center of Crankshaft to Center of Needle Assembly: 1.4" (36mm)
Center of Crankshaft to Outer Edge of Carburetor: 1.8" (45mm)
Muffler Angle in Relation to Engine: 10

Needle Settings: High Speed: 2.5 - 3 turns out from fully closed
Mixture Control (low speed): Flush with carb body,
then 1 turn in.
jxs 12/21/07
ir/jxs
updt lmm 4/6/09

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

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Accessories Needed
 
COMPLETION NOTES FROM THE TECH DEPARTMENT
THIS IS THE GLOW POWERED O.S. FS81-a 4-STROKE AIRCRAFT ENGINE. FEATURES: IDEAL FOR 60 SIZE AIRCRAFT, SAME MOUNTING DIMENSIONS AS FS-70 SURPASS F5030 MUFFLER WITH RUBBER O-RING IN MULTI POSITION MANIFOLD, TYPE F GLOW PLUG REQUIRES: FUEL-10-20% NITRO WITH 18% LUBRICANT, PROP, FIELD EQUIPMENT

Accessories for the O.S. 81FS-a Ringed 4-Stroke w/Muffler

Primary Accessories     Optional Accessories
 
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
Status
 LXHY36 Top Flite 14x6 Power Point Propeller
Qty Discount Available
5.99   In Stock
Limited Quantities
 LXRXC4 Tower Hobbies TOWER Power 10% Airplane Fuel Quart
Qty Discount Available
9.19   In Stock
Subtotal for this Group of Accessories: 15.18  
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Primary Accessories     Optional Accessories

 
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