Image of the Air Force wings with the museum name underneath

Open daily from 9 a.m. to 5 p.m. 
FREE Admission & Parking

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.

Model: R-1830-90C
Type: 14-cylinder, air-cooled, twin row radial
Displacement: 1,830
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.