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North American RA-5C Vigilante [Flickr]

North American RA-5C Vigilante [Flickr]

Released Thursday, 14th December 2017
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North American RA-5C Vigilante [Flickr]

North American RA-5C Vigilante [Flickr]

North American RA-5C Vigilante [Flickr]

North American RA-5C Vigilante [Flickr]

Thursday, 14th December 2017
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Greg Nutt posted a photo:

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The North American A-5 Vigilante is an American carrier-based supersonic bomber designed and built by North American Aviation for the United States Navy. Its service in the nuclear strike role to replace the Douglas A-3 Skywarrior was very short; however, as the RA-5C, it saw extensive service during the Vietnam War in the tactical strike reconnaissance role. Prior to the unification of the Navy designation sequence with the Air Force sequence in 1962, it was designated the A3J Vigilante.

In 1953, North American Aviation began a private study for a carrier-based, long-range, all-weather strike bomber, capable of delivering nuclear weapons at supersonic speeds. This proposal, the North American General Purpose Attack Weapon (NAGPAW) concept, was accepted by the United States Navy, with some revisions, in 1955. A contract was awarded on 29 August 1956. Its first flight occurred two years later on 31 August 1958 in Columbus, Ohio.

At the time of its introduction, the Vigilante was one of the largest and by far the most complex aircraft to operate from a United States Navy aircraft carrier. It had a high-mounted swept wing with a boundary-layer control system (blown flaps) to improve low-speed lift. There were no ailerons. Roll control was provided by spoilers in conjunction with differential deflection of the all-moving tail surfaces. The use of aluminum-lithium alloy for wing skins and titanium for critical structures was also unusual. The A-5 had two widely spaced General Electric J79 turbojet engines (the same as used on the McDonnell Douglas F-4 Phantom II fighter), fed by intake ramps and a single large all-moving vertical stabilizer. Preliminary design studies had employed twin vertical fin/rudders. The wings, vertical stabilizer and the nose radome folded for carrier stowage. The Vigilante had a crew of two seated in tandem, a pilot and a bombardier-navigator (BN) (reconnaissance/attack navigator (RAN) on later reconnaissance versions) in individual North American HS-1A ejection seats.

Despite being designated by the US Navy as a "heavy", the A-5 was surprisingly agile for such a large aircraft. Without the drag of bombs or missiles, even escorting fighters found that the clean airframe and powerful engines made the Vigilante very fast at high and low altitudes. However, its high approach speed and high angle of attack in the landing configuration made returning to the aircraft carrier a challenge for inexperienced or unwary pilots.

The Vigilante had advanced and complex electronics when it first entered service. It had one of the first "fly-by-wire" systems on an operational aircraft (with mechanical/hydraulic backup) and a computerized AN/ASB-12 nav/attack system incorporating a head-up display ("Pilot's Projected Display Indicator" (PPDI), one of the first), multi-mode radar, radar-equipped inertial navigation system(REINS, based on technologies developed for North American's Navaho missile), closed-circuit television camera under the nose, and an early digital computer known as "Versatile Digital Analyzer" (VERDAN) to run it all.

On 13 December 1960, Navy Commander Leroy Heath (Pilot) and Lieutenant Larry Monroe (Bombardier/Navigator) established a world altitude record of 91,450.8 feet in an A3J Vigilante carrying a 1,000 kilogram payload, beating the previous record by over four miles. This new record held for more than 13 years.

The attempt was accomplished by reaching a speed of Mach 2.1, then pulling up to create a ballistic trajectory beyond the altitude its wings could continue to function. The engines flamed out in the thin atmosphere, and the aircraft rolled onto its back. This had already been experienced in previous flights, and so the pilot simply released the controls and the aircraft regained control naturally as it descended back into the thicker air of the lower atmosphere.

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