|YB-60 prototype, Convair B-36F in the background|
|First flight||18 April 1952|
|Status||Canceled 14 August 1952|
|Number built||1 complete, 1 partial|
|Program cost||US$14.3 million for program|
|Developed from||Convair B-36|
On 25 August 1950, Convair issued a formal proposal for a swept-winged version of the B-36 with all-jet propulsion. The United States Air Force was sufficiently interested that on 15 March 1951, it authorized Convair to convert two B-36Fs (49-2676 and 49-2684) as B-36Gs. Since the aircraft was so radically different from the existing B-36, the designation was soon changed to YB-60.
The YB-60 had 72% parts commonality with its piston-engined predecessor. The fuselages of the two aircraft were largely identical, although the YB-60 had a longer, pointed nose with a needle-like instrument probe instead of the B-36's rounded nose; its tail surfaces were swept to match the wings and a wedge-shaped insert added at the wing root. The swept wings also used many B-36 parts.
The YB-60's unofficial competitor for an Air Force contract was Boeing's B-52 Stratofortress. Convair's proposal was substantially cheaper than Boeing's, since it involved modifying an existing design rather than starting from scratch. Like the B-52, it was powered by eight Pratt & Whitney J57-P-3 turbojets mounted in pairs in four pods suspended below the wing.
Instead of the B-36's crew of 15, the YB-60's crew numbered 10. Production B-60s were to have defensive armament similar to those of the B-36.
Convair YB-60 serial number 49-2676 made its maiden flight on 18 April 1952, piloted by Beryl Erickson. The Boeing YB-52 beat the Convair aircraft into the air by three days. The YB-60 was approximately 100 mph (160 km/h) slower than the YB-52 and also had severe handling problems. It carried a heavier bomb load — 72,000 lb (33,000 kg) against 43,000 lb (20,000 kg) for the YB-52 — but the Air Force did not see the need for the extra capacity, given the YB-60's other drawbacks. Later, "big belly" modifications increased the B-52's bomb load to 60,000 pounds (27,000 kg).
The flight test programs were canceled on 20 January 1953, with 66 flying hours accumulated. A second prototype was never completed: the airframe was built, but it was not fitted with engines or much equipment. Since Convair completed their prototype contract satisfactorily, both YB-60s were formally accepted by the Air Force in 1954. The operational aircraft never flew again, and both airframes were scrapped by July.
Aircraft of comparable role, configuration and era
B60 may refer to :
HLA-B60, an HLA-B serotype
B60 (New York City bus) in Brooklyn
Sicilian, Richter-Rauzer, Encyclopaedia of Chess Openings code
Bundesstraße 60, a German road
a United Kingdom postcode area covering the town of Bromsgrove, Worcestershire
Rolls-Royce B60 Engine, an inline-six petrol engine primarily used in the Daimler Ferret.B-60 may refer to :
Convair YB-60, an American aircraft
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