Pratt & Whitney R-1830-90C Note: This item is currently in storage. The Pratt & Whitney R-1830 Twin Wasp engine was one of the most efficient and reliable engines of the 1930s. It was introduced in 1932 with either a 6.1 or 6.5 compression ratio and 775 or 825 hp, respectively, at 2,400 rpm. To reach its designed power, the R-1830 needed the highest octane gasoline available. Using improved fuel, the R-1830 reached 1,000 hp and later 1,200 hp. It has 14 cylinders in two banks of seven. The R-1830 was used on B-24s, C-47s and the Grumman F4F-4 Wildcat, until it was phased out by Grumman. Pratt & Whitney built 13,464 R-1830-90C engines for the C-47 aircraft. It was also used in a variety of British aircraft including the Royal Air Force Catalinas, Short Sunderland Vs, Maryland bombers and Bristol Beauforts. TECHNICAL NOTES: Model: R-1830-90C Type: 14-cylinder, air-cooled, twin row radial Displacement: 1,830 cu.in. Maximum rpm: 2,400 Maximum hp: 1,200 Weight: 1,467 lbs. Click here to return to the Featured Accessions index. Find Out More Related Fact Sheets Consolidated B-24D Liberator Douglas C-47D Skytrain Note: The appearance of hyperlinks does not constitute endorsement by the National Museum of the USAF, the U.S. Air Force, or the Department of Defense, of the external website, or the information, products or services contained therein.