Pratt & Whitney R-1830 Twin Wasp Engine

Pratt & Whitney began its experimentation & development of double-row engines in 1929. The advantages of the double-row power plant for aircraft were that a larger engine displacement could be achieved with no increase in the frontal area of the engine (truly a savings of drag on the airplane!). Smaller cylinders could also be used which permitted greater crankshaft speeds creating smoother operation. The smaller, more frequent power impulses also contributed to engine smoothness of operation and longer engine life between overhauls.

The R-1830 is a fourteen cylinder, double-row, air-cooled radial engine. Some of its statistical data are as follows. Horsepower 1, 200 at 2, 600 RPM for takeoff Horsepower and 700 at 2, 325 RPM for cruising operations at 13, 120 feet.

Compression ratio 6.7:1            Piston Stroke 5.5 inches 
Cylinder Bore 5.5 inches           Total engine displacement 1, 829 cubic inches.
Dry Weight 1, 250 pounds.

The engine has internally a supercharger that is a centrifugal type.

The engine in this museum has been cut away or sectioned so that you can see many of the internal parts and features. If you look closely you will find the internal supercharger.

More Twin Wasps were built than any other aviation piston engine in history, 173, 618 according to the records over the time period of 1931 - 1951. Many United States and foreign aircraft were powered by this engine. The following partial list indicates just a few of the more popular aircraft it was used on. Consolidated B-24 Liberator Consolidated PBY Catalina Curtiss P-36 Hawk Douglas DC-3, C-47 Grumman F4F Wildcat Republic Aviation P-43