The R-3350 is inseparable from the Boeing B-29 Superfortress, the aircraft that ended World War II. But the engine’s development was troubled: early R-3350s suffered from cooling problems and reliability issues that required extensive maturation before the B-29 could deploy reliably. The -23 variant represents a mid-production standard in that evolution .
R-3350-23 Configuration
The primary subject of this technical guide focuses on the Wright R-3350-23 engine, engineered specifically for 18-Cylinder, 2-Row Radial, Air-Cooled applications. Below is an essential digest of this powertrain configuration.
• 18-cylinder two-row radial
• 3,350 cu in displacement
• Powered B-29 and C-119
• 2,200–3,500+ hp range
R-3350-23 Basic Specifications
18 cylinders in two rows; 3,350 cu in displacement; air-cooled; power ratings varied by model from 2,200 to over 3,500 hp .
The Duplex-Cyclone’s twin-row layout packed 18 cylinders into a compact diameter, but cooling the rear row was a persistent challenge. The B-29’s engine installations required careful baffling and cowl flap management to keep cylinder temperatures within limits. The R-3350 powered not only the B-29 but also the C-119 Flying Boxcar, C-121 Constellation, and A-1 Skyraider, among others . Production continued into the 1950s .
| Configuration | 18-cylinder, 2-row radial |
|---|---|
| Cooling | Air-cooled |
| Displacement | 3,350 cu in |
| Power Range | 2,200–3,500+ hp (model dependent) |
| Fuel | Aviation gasoline |
Aircraft Powered by the R-3350-23
This engine model is deployed across various operational frameworks. Here is a breakdown of the typical machine or vehicle applications using this unit:
Boeing B-29 Superfortress (various variants), Fairchild C-119 Flying Boxcar, Lockheed C-121 Constellation, Douglas A-1 Skyraider
Pros & Advantages
High power output for its era; proven in long-range bomber service; powered diverse military and civilian types.
Cons & Disadvantages
Early variants suffered cooling problems; complex maintenance on 18 cylinders; reliability required extensive development.
Frequently Asked Questions (FAQs)
Q1: What aircraft used the R-3350-23?
A1: The R-3350 family powered the Boeing B-29, Fairchild C-119, Lockheed C-121, and Douglas A-1 Skyraider, among others .
Q2: How much horsepower did the R-3350-23 produce?
A2: Power ranged from 2,200 to over 3,500 hp depending on the specific model and configuration .
Q3: What was the R-3350’s main development challenge?
A3: Cooling the rear row of cylinders in the two-row layout was difficult, and early variants suffered reliability issues that required extensive maturation .
Production continued into the 1950s, with thousands of engines built for military and commercial aircraft .