Experimental Craft Hydrofoil No. 4 (XCH-4)
From Wikipedia, the free encyclopedia
 USS XCH-4 underway | |
| History | |
|---|---|
 United States | |
| Builder | Dynamic Developments Inc. |
| General characteristics | |
| Displacement | 16,000 lbs |
| Length | 53 ft (16 m) |
| Beam | 32 ft (9.8 m) |
| Propulsion | 2 Pratt and Whitney R-985 450 hp each |
| Speed | Maximum 78 knots (foil-borne) |
The Experimental Craft Hydrofoil No. 4 (XCH-4) was a high speed hydrofoil of the United States Navy. In 1947 the Bureau of Ships in association with the Office of Naval Research subsidized the construction of a number of small watercraft to explore several different types of foils and foil control-system configurations. The XCH-4 (sometimes referred to as "The Carl Boat") was designed by John H. Carl and built, in 1953, by Dynamic Developments Inc., a former associate of the Grumman Aircraft Engineering Corporation.[1][2]
The XCH-4 employed three struts with "ladder" type hydrofoils. The foils were swept back approximately 45 degrees and have considerable dihedral providing a very stable ride even in moderately rough seas. The design eliminated drag inducing water propeller drive systems in favor of aircraft type propellers powered by two Pratt & Whitney R-985 Wasp Junior radial engines and in 1955 the vessel set a world speed record 78 knots.[3][4]
