Pratt & Whitney R-1690

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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.

Contents 1 Specifications 2 Models 3 Aircraft 4 External links

[edit] Specifications

General characteristics

• Type: 9-cylinder air-cooled radial engine
• Bore: 6.125 inch (circa 155.5 mm)
• Stroke: 6.375 inch (circa 161.9 mm)
• Displacement: 1,690 in³ (27.7 L)
• Length: 44 - 50 in
• Height: 54.3 in (1,379 mm)
• Dry weight: 840 to 1,070 lbs (381 to 485.5 kg)

Components

• Valvetrain: OHV
• Supercharger: yes
• Turbocharger: no
• Fuel system: one Stromberg carburetor
• Fuel type: 80 - 87 octane
• Cooling system: Air-cooled

Performance

• Power output: 525 to 875 hp (391.5 to 652.5 kW)
• Compression ratio: 6.0:1

[edit] Models

A turbocharged version was available.

[edit] 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

[edit] External links

• http://www.pratt-whitney.com/pratt/web/index14a4.html