R-600 Challenger
Preserved R-600 engine
Type	Radial engine
Manufacturer	Curtiss Aeroplane and Motor Company
First run	1920s

The Curtiss R-600 Challenger was a six-cylinder, double-row, air-cooled, radial engine for aircraft use built in the United States in the late 1920s. It developed 170 to 180 horsepower (127 to 134 kW).

Curtiss started work on a small six-cylinder engine in May 1927.^[1] The engine was unusual in its design with aluminium cylinders mounted at 60°, so that it was in effect two staggered three cylinder engines.^[2] The engine was first run in December 1927, and was taken to market producing between 170 and 180 horsepower (127 and 134 kW) at 1,800 rpm.^[1]

• ANBO VI
• Consolidated XPT-5
• Curtiss Robin
• Curtiss-Wright CW-14C Travel Air
• Hodkinson HT-1
• Rearwin 2000

Data from Nutt, 1928 p.842^[3]

• Type: Six-cylinder, double-row, radial engine
• Bore: 5.125 in (130.2 mm)
• Stroke: 4.875 in (123.8 mm)
• Displacement: 603.4 cu in (9.89 L)
• Diameter: 42.625 in (1082.7 mm)
• Dry weight: 420lb (190.5 kg)

• Cooling system: Air-cooled

• Power output: 170 hp (127 kW) at 1,800 rpm

Comparable engines

• Bristol Jupiter
• Continental R-670
• Pratt & Whitney R-985 Wasp Junior

Related lists

• List of aircraft engines

• Nutt, Arthur (8 September 1928). "The Curtiss "Challenger"". Aviation: 808–842.
• USAF museum

Media related to Curtiss R-600 at Wikimedia Commons