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NORTH AMERICAN B-77

Posted 7/8/2009 Printable Fact Sheet

The Hound Dog is an air-launched supersonic missile designed to destroy heavily-defended ground targets. The Hound Dog was originally designated B-77, but this was quickly changed to GAM-77 and later changed again to AGM-28. Two AGM-28s were carried on specially modified B-52s, one beneath each wing. No AGM-28s were ever used in combat, but on a typical mission an AGM-28 would be launched at an altitude of 45,000 feet, climb to over 56,000 feet, cruise to the target area, and then dive to the target. The missile has a range of more than 600 miles, allowing "stand-off" launch hundreds of miles from the target, thus reducing the risk to the launch aircraft.

The first AGM-28 was launched on April 23, 1959, and production missiles entered service with SAC in December of that year. In 1960 SAC developed a method for using the missiles' jet engines to provide extra power for the B-52 carrier in flight or on takeoff. The missiles could then be refueled in flight from the bomber's fuel tanks.

The AGM-28B, an advanced version of the A, first flew in May 1961. It incorporates an improved guidance system and has greater range. Almost 700 AGM-28s were built before production ended in 1963; 428 of them were Bs. Several hundred Hound Dog missiles were still in operational use in 1977. 

The museum has an AGM-28B on display in the Cold War Gallery.


Type Number built/
converted
Remarks
GAM-77 - Air-launched ground attack missile


Note: The B-77 became the GAM-77 (Guided Air Missile) and later the AGM-28 (Air launched Ground attack Missile) .

TECHNICAL NOTES:
Armament: Thermonuclear warhead
Engine: One Pratt & Whitney J52 turbojet of 7,500 lbs.
Cruising speed: 1,200 mph
Range: 785 miles
Operating altitude: 200 ft. to 56,200 ft.
Span: 12 ft. 2 in.
Length: 42 ft. 6 in.
Height: 9 ft. 4 in.
Weight: 10,147 lbs.

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