The R-1830 was one of the most efficient and reliable engines of the 1930s, and the -90C variant became synonymous with the C-47 Skytrain, the aircraft that carried Allied airborne troops and cargo across every theater of World War II. Its 14 cylinders in two banks of seven delivered 1,200 hp on the high-octane fuel that became standard during the war .
R-1830-90C Design and Production
The primary subject of this technical guide focuses on the Pratt & Whitney R-1830-90C Twin Wasp engine, engineered specifically for 14-Cylinder, 2-Row Radial, Air-Cooled applications. Below is an essential digest of this powertrain configuration.
• 14-cylinder two-row radial
• 1,200 hp output
• 13,464 built for C-47
• Powered B-24 and Wildcat
R-1830-90C Specification Summary
14 cylinders in two rows of seven; 1,830 cu in displacement; 1,200 hp; dry weight 1,467 lb; 13,464 units built for the C-47 alone .
The Twin Wasp’s two-row layout packed 14 cylinders into a compact diameter, but cooling the rear row required careful baffling. The engine’s compression ratio was initially 6.1 or 6.5, producing 775 or 825 hp at 2,400 rpm; improved fuel and development pushed output to 1,000 hp and then 1,200 hp . Beyond the C-47, the R-1830 powered the B-24 Liberator, Grumman F4F Wildcat, and British types including the Catalina and Sunderland .
| Configuration | 14-cylinder, 2-row radial |
|---|---|
| Cooling | Air-cooled |
| Displacement | 1,830 cu in |
| Power | 1,200 hp |
| Weight | 1,467 lb |
| Fuel | Aviation gasoline (high octane) |
| Production (-90C) | 13,464 units |
Aircraft Powered by the R-1830-90C
This engine model is deployed across various operational frameworks. Here is a breakdown of the typical machine or vehicle applications using this unit:
Douglas C-47 Skytrain, Consolidated B-24 Liberator, Grumman F4F Wildcat, RAF Catalina, Short Sunderland V
Pros & Advantages
High reliability; efficient for its era; massive production volume ensured parts availability.
Cons & Disadvantages
Rear-row cooling challenges; heavy; requires high-octane fuel for maximum output.
Frequently Asked Questions (FAQs)
Q1: How many R-1830-90C engines were built?
A1: 13,464 units were manufactured specifically for the Douglas C-47 .
Q2: What was the R-1830’s original power rating?
A2: Introduced in 1932 at 775 or 825 hp depending on compression ratio, eventually reaching 1,200 hp .
Q3: Which famous bombers used the R-1830?
A3: The Consolidated B-24 Liberator was the most prominent bomber application .
Yes, including RAF Catalinas, Short Sunderland Vs, Maryland bombers, and Bristol Beauforts .