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Malo o motoru :
Pratt & Whitney Wasp Junior R-985
Model: R-985 B5.
Type: 9 cylinders, 1-row radial, air cooled, direct drive, supercharged, 4-cycle. A.T.C. 123.
Construction: 2-piece aluminum alloy crankcase. Cylinders with steel barrels and aluminum alloy heads. 1 inlet valve and 1 exhaust valve per cylinder actuated by push rods. 1-throw 2-piece counterbalanced crankshaft supported in 2 roller bearings. Provision for Hydromatic propeller.
Supercharger: Gear-driven 1-speed supercharger, ratio 10.0:1.
Fuel system: 1 Bendix-Stromberg NA-R9B or NA-R9C updraft carburetor with automatic mixture control.
Ignition: 2 Bendix-Scintilla SB9RN -3 magnetos. 2-18-mm short reach spark plugs per cylinder. Shielded ignition system.
Lubrication: Pressure feed, 70-90 lb./ sq.fn. ( 4,9-6,3 kg/cm2). Dry sump.
Starter: Optional. Eclipse E-160 or 1416 direct cranking electric starter can be used.
Bore: 5.1875 in. | 132 mm
Stroke: 5.1875, in. | 132 mm
Displacement: 985 cu.in. | 16,1 lit
Compression ratio: 6.0:1 | 6,0:1
Diameter: 46.1 in. | 1172 mm
Length: 42.4 in. | 1078 mm
Frontal area: 11.6 sq.ft. | 1,08 m2
Weight: 682 lb. | 309 kg
Weight/horsepower: 1.51 lb./h.p. | 0,68 kg/hp
Fuel consumption (cr.): 0.47 lb./h.p./hr. | 215 g/ hp/hr
Oil consumption (cr.): 0.015 lb./ h.p./ hr. | 7 g/hp/hr
Gasoline grade: 91/96 grade | 91/96 grade
Oil grade (viscosity): 100-120 S.U. secs. | 20,5-25,1 cs
Output/displacement: 0.46 h.p./cu.in. | 27,9 hp/lit
Output/piston area: 2.32 h.p./sq.in. | 0,36 hp/cm2
Piston speed (max.): 1,988 ft./min. | 10,1 m/sec
B.m.e.p. (max.): 157 lb./sq.in. | 11,0 kg/cm2
Rating (take-off): 450 h.p./ 2,300 r.p.m./36.5 in. (927 mm) + 3.3lb.
Rating (normal): 450 h.p./ 2,300. r.p.m./ 2,300 ft. (700 m)
Rating (max. cruising): 300 h.p./2,000 r.p.m./ 8,000 ft. (2400 m)
R-985 B3: Same as R-985 B5, but with provision for hydraulically operated feathering propeller.
R-985 B4: Same as R-985 B5, and can be used with crankshaft in vertical plane in helicopters. A.T.C. 123.
izvor
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