This is the glow powered O.S. FS81-a P 4-Stroke Aircraft Engine
with the PD-08 Fuel Pump.
FEATURES: Same mounting dimensions as the O.S. Max FS-70 Surpass II
Ideal fit for 60 size planes
Fuel pump delivers fuel consistently to the engine at all times
regardless of aircraft's attitude and fuel level
Specially designed lubrication system eliminates need for crankcase
61R carburetor with attached regulator
F5030 muffler with rubber O-ring in multi position manifold to help
prevent oil leakage
INCLUDES: O.S. FS81-a P 4-Stroke Aircraft Engine, carburetor, muffler, header,
type F glow plug, PD-08 pump and instruction manual
REQUIRES: 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, 14x6-7
SPECS: Displacement: 0.809 cu in (13.26cc)
Bore: 1.091" (27.7mm)
Stroke: .866" (22mm)
Weight with Muffler: 22oz (624g)
Practical RPM Range: 2200-10,000
Output: 1.28 PS, 1.28 HP @ 10,000 RPM
Height from Bottom of Mounting Tab to Top of Crankcase: 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 Drive Washer: 2.2" (55.5mm)
Center of Rear Mounting Hole to Drive Washer: 3" (76.2mm)
Center of Crankcase to Center of Needle Assembly: 1.4" (35.6mm)
Center of Crankcase to Outer Edge of Needle Assembly: 1.8" (45.7mm)
Muffler Angle in Relation to Engine: 10°
Carburetor Needle Settings: Needle Valve, 1-1/2 - 2 turns open from