Pratt & Whitney R-2180-E Twin Wasp E

Not to be confused with Pratt & Whitney R-2180-A Twin Hornet.

The Pratt & Whitney R-2180-E Twin Wasp E was a radial aircraft engine developed in the United States by Pratt & Whitney. It had two rows of seven cylinders each. Its only production application was on the post-World War II Saab 90 Scandia airliner.

R-2180-E Twin Wasp E
A Saab Scandia powered by two P&W R-2180 Twin Wasp E engines
Type	Radial engine
National origin	United States
Manufacturer	Pratt & Whitney
First run	1945[citation needed]
Major applications	Saab 90 Scandia
Developed from	Pratt & Whitney R-2800 Pratt & Whitney R-4360

Design and development

The R-2180-E is effectively a fourteen-cylinder simplification of the twenty-eight cylinder R-4360 Wasp Major engine; its cylinders are the same size and displacement as those of the Wasp Major.^[1]

The R-2180-E Twin Wasp E was available in a "power-egg" installation certificated in 1945 for use as an engine upgrade for the Douglas DC-4.^[2]

Applications

• Piasecki XH/YH-16 Transporter^[3]
• Saab 90 Scandia

Specifications (R-2180-E1)

Data from Aviation Week^[4]

General characteristics

• Type: 14-cylinder, supercharged, air-cooled, twin-row radial engine
• Bore: 5.75 in. (146 mm)
• Stroke: 6.00 in. (152 mm)
• Displacement: 2,181 in³ (35.7 L)
• Length: 76.20 in (1.94 m)
• Diameter: 54 in (1.37 m)
• Dry weight: 1,870 lb (850 kg)

Components

• Fuel system: Stromberg AR-48C1
• Fuel type: 100/130 octane
• Cooling system: Air-cooled

Performance

• Power output:
  • Take-off without water injection: 1,650 hp (1,230 kW)
  • Take-off with water injection: 1,800 hp (1,300 kW)
  • Max continuous: 1,400 hp (1,000 kW)
  • Normal: 1,300 hp (970 kW)
• Compression ratio: 7:1

See also

Related development

• Pratt & Whitney R-2180-A Twin Hornet
• Pratt & Whitney R-1830 Twin Wasp
• Pratt & Whitney R-2000 Twin Wasp
• Pratt & Whitney R-2800 Double Wasp
• Pratt & Whitney R-4360 Wasp Major

Related lists

• List of aircraft engines