O.S. Engines FS72-A Ring 61N Carburetor OSMG0877
This is the glow powered O.S. 72FS-a 4-Stroke Aircraft Engine.
Features
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O.S. FS72-A 34720 Ring 61N Carburetor OSMG0877
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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
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Broad power band suitable for
Scale as well as Sport models
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Same mounting bolt pattern as
the FL-70 and FS-70 Ultimate
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New 61N carburetor with
extended intake tube eliminates reverse flow tendency of air/fuel mixture,
carb is reversible 180°
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Blow-by internal oil system
eliminates the need for a crankcase breather fitting
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Adjustable exhaust outlet
direction and exhaust port to muffler distance
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Same muffler as the O.S.
81FS-a offers a pleasant exhaust sound with a lower sound level
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Two year limited warranty
Specifications
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Displacement: 0.72 cu in
(11.79cc)
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Bore: 1.063" (27.0mm)
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Stroke: 0.822" (20.6mm)
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Weight: Engine, 16.79oz (476g)
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Silencer & Manifold,1.90oz
(54g)
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Power output: 1.2 ps/11,000
RPM
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Practical RPM: 2,400-12,500
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Height from Bottom of Mounting
Tab to Top of Crankcase: 3.5" (90mm)
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Width of Crankcase below
Mounting Tabs: 1.4" (36mm)
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Center of Mounting Holes Same
Side: .79" (20mm)
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Center of Mounting Holes
Opposite Side: 1.8" (45mm)
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Center of Front Mounting Hole
to Drive Washer: 1.9" (49.5mm)
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Center of Rear Mounting Hole
to Drive Washer: 2.7" (69.5mm)
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Center of Crankcase to Center
of Needle Assembly: 0.83" (21.3mm)
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Center of Crankcase to Outer
Edge of Needle Assembly: 1.3" (33.7mm)
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Muffler Angle in Relation to
Engine: 11°
Contents
Comments
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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.
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When choosing fuels for this
engine, be sure to select a fuel with at least an 18% lubricant content.
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Propeller: Sport and aerobatic
scale 12x7, 13x6-8, 14x6-7
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