That was was a really cool airplane. Today little known, in 1953 the Douglas F4D
Skyray held the absolute speed record of 752 mph, making it the first Navy plane that could exceed the speed of sound in level flight. In it's day it held a number of time-to-height records including from a standing start flying to 49,221 ft in 2 minutes and 36 seconds. Add to this an incredible 55,000 ft altitude capability, 5,000 ft higher than a F/A-18 of today.
X-ray of a
Skyray. This had to be one of the last American planes built with guns in the wings.
Skyray production line in El Segundo, CA, c. 1956. This picture, I think, makes them look futuristic, like Star Wars
X-Wing fighters.
The
Skyray used the Pratt-Whittney J57 turbojet engine. The same engine used in the North American F-100
Super Sabre, Vought F-8
Crusader, and McDonnell F-101
Voodoo. A non-afterburn version of the J57 was used to power the Boeing B-52
Stratofortress. Suffice to say, for it's time, it had a really good engine.
The
Skyray had an advanced Westinghouse APQ-50 (
Aero 13) modular fire control radar system, the same radar used in early F-4
Phantoms. The
Aero 13 lead to a family of "plug-in" open architecture radars, upgraded and improved over the decades, culminating in the AN/APQ-120. Direct decedents of which are still in use with the US Navy and other air forces to this day.
Early Westinghouse
Aero 13. Note the vacuum tubes.
There were three flaws that caused the
Skyray to be withdrawn after only about 8 years in fleet service. One, it was built with no provisions for aerial refueling. In 1947 Douglas didn't anticipated how critical this feature would be. Two, it had a reputation as being difficult to fly. The plane was naturally unstable, which gave it great maneuverability, but it had too many "watch outs" and "don't go theres" in it's flight envelope. It was tiring to fly and required constant inputs from the pilot. Three, it was a dedicated interceptor and the Navy was moving to multi-role aircraft. Though it had six hard-points, with Vietnam on the horizon, the Navy elected to replace it with newer designs that were better adapted to multi-role uses.