12/31/2010. One of the most innovative single-seat fighters of the 'fifties, combining the then latest developments in aerodynamics and hydrodynamics, the Model 2 Sea Dart was designed to meet a requirement for a seaplane fighter capable of Mach 0.95 (704 mph, 1,134 kmh), but was expected to achieve Mach 1.5 (1,112 mph, 1,790 kmh).
Utilizing a blended hull and hydro-skis, two prototype Sea Darts were ordered on January 19, 1951, under the designation XF2Y-1 and the BuNo. 137634 and 137635. Twelve production examples were ordered on August 28, 1952 as F2Y-1s (BuNo. 135762 to 135773), later the first four were redesignated YF2Y-1s, and another four F2Y-1s (BuNo. 138530 to 138533) were added.
The Sea Dart was intended to be powered by two Westinghouse XJ46-WE-2 turbojets each offering 6,100 lb (2,767 kg) s.t with afterburning, but the first XF2Y-1, which flew on April 9, 1953, had two 3,400 lb (1,542 kg) s.t Westinghouse J34-WE-32s. Severe vibration of the hydro-skis while taxing and poor high-speed performance led to the cancellation of one XF2Y-1 (BuNo. 137635) and all F2Y-1s.
The power output forecast for the XJ46-WE-2 intended for the Sea Dart failed to measure up to expectations and indicated that a max speed no higher than Mach 0.99 (735 mph, 1,181 kmh) was likely to be attained. The XF2Y-1 was initially flying with J34s and was later retrofitted with J46-WE-2s which also powered all three remaining YF2Y-1s. Limited trials were continued until 1956, when the entire program was abandoned. Fate of the individual (completed) aircraft:
137634 XF2Y-1 stored at the NASM Paul E. Garber Facility, Suitland,
135762 YF2Y-1 written off on November 4, 1954
135763 YF2Y-1 on display at San Diego Aerospace Museum, San Diego,
135764 YF2Y-1 never flown, on display at Wings of Freedom Museum,
NAS Willow Grove, Pennsylvania
135765 YF2Y-1 never flown, previously displayed at Seattle, Washington,
presently at Florida Air Museum, Lakeland, Florida