The Pratt & Whitney R-1690 Hornet was an engine widely used in American aircraft, 2,944 were produced from 1926 through 1942. It first flew in 1927. It was a single-row, 9-cylinder air-cooled radial design. Displacement was 1,690 cubic inches (27.7 L). It was built under licence in Italy as the Fiat A.59. In Germany, the BMW 132 was an improved version of this engine.
pecifications (R-1690 SIE-G)
pistonspecs
ref=[cite book|last=Tsygulev|title=Aviacionnye motory voennykh vozdushnykh sil inostrannykh gosudarstv ( _ru. Авиационные моторы военных воздушных сил иностранных государств)|publisher=Gosudarstvennoe voennoe izdatelstvo Narkomata Oborony Soyuza SSR|location=Moscow|year=1939|url=http://base13.glasnet.ru/text/aviamotory/t.htm] ]
type=Nine-cylinder single-row supercharged air-cooled radial engine
bore=6.12 in (156 mm)
stroke=6.38 in (162 mm)
displacement=1,690 in³ (27.7 l)
length=50.98 in (1,295 mm)
diameter=54.41 in (1,382 mm)
width=
height=
weight=1,014 lb (460 kg)
valvetrain=Pushrod-actuated
supercharger=Single-speed centrifugal type supercharger, 12.0:1 reduction
turbocharger=
fuelsystem=Two-barrel Stromberg carburetor
fueltype=87 octane rating gasoline
oilsystem=
coolingsystem=Air-cooled
power=
* 789 hp (589 kW) at 2,300 rpm for takeoff
* 740 hp (552 kW) at 2,250 rpm at 7,000 ft (2,135 m)
specpower=0.47 hp/in³ (21.26 kW/l)
specfuelcon=0.6 lb/(hp•h) (362 g/(kW•h))
oilcon=0.42 oz/(hp•h) (16 g/(kW•h))
power/weight=0.78 hp/lb (1.28 kW/kg)
compression=6.0:1
reduction_gear=Epicyclic gearing, 2:3
Models
A turbocharged version was available.
Aircraft
*Bach Air Yacht
*Bellanca 31-40
*Boeing 80
*Boeing Model 95
*Boeing 221
*Douglas O-38
*Fokker F.32
*Junkers Ju-52
*Junkers Ju-86
*Junkers W 34
*Keystone B-3
*Lockheed Lodestar C-56A, C-56B, C-56C, C-56D, C-56E, C-59/Mk 1a
*Martin B-10 XB-14
*Sikorsky S-42
*Sikorsky S-43
*Vought O2U Corsair
*Wedell-Williams Model 44
References
External links
* http://www.pratt-whitney.com/pratt/web/index14a4.html
