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Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:34
Le B-36 à aile en fleche et turboréacteur proposé par Convair sur Wikipedia de langue anglaise
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The [Vous devez être inscrit et connecté pour voir ce lien] YB-60 was an [Vous devez être inscrit et connecté pour voir ce lien] experimental [Vous devez être inscrit et connecté pour voir ce lien] prototype for the [Vous devez être inscrit et connecté pour voir ce lien] canceled on 14 August 1952.
Design and development
On 25 August 1950, Convair issued a formal proposal for a swept-winged version of the B-36 with all-jet propulsion.
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-----------------------------------Je cite :
The [Vous devez être inscrit et connecté pour voir ce lien] YB-60 was an [Vous devez être inscrit et connecté pour voir ce lien] experimental [Vous devez être inscrit et connecté pour voir ce lien] prototype for the [Vous devez être inscrit et connecté pour voir ce lien] canceled on 14 August 1952.
Design and development
On 25 August 1950, Convair issued a formal proposal for a swept-winged version of the B-36 with all-jet propulsion.
Alexandry2- CLUB
- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:35
The [Vous devez être inscrit et connecté pour voir ce lien] was sufficiently interested that on 15 March 1951, the USAF 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.
Since the aircraft was so radically different from the existing B-36, the designation was soon changed to YB-60.
Alexandry2- CLUB
- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:37
The YB-60 betrayed its 72% parts commonality with its piston-engined forebear.
The [Vous devez être inscrit et connecté pour voir ce lien] 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, and the tail surfaces were all new, swept to match the wings, instead of the B-36's more antiquated design.
The swept wings used a lot of B-36 parts, with a wedge-shaped insert at the wing root to sweep the wings back more than the B-36's wings.
The [Vous devez être inscrit et connecté pour voir ce lien] 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, and the tail surfaces were all new, swept to match the wings, instead of the B-36's more antiquated design.
The swept wings used a lot of B-36 parts, with a wedge-shaped insert at the wing root to sweep the wings back more than the B-36's wings.
Alexandry2- CLUB
- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:39
The YB-60's unofficial competitor for an Air Force contract was [Vous devez être inscrit et connecté pour voir ce lien]'s [Vous devez être inscrit et connecté pour voir ce lien].
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 [Vous devez être inscrit et connecté pour voir ce lien] mounted in pairs in four pods suspended below the wing.
Instead of the B-36's crew of fifteen, the YB-60's crew numbered only 10.
Production B-60s were to have similar defensive armament to the B-36.
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 [Vous devez être inscrit et connecté pour voir ce lien] mounted in pairs in four pods suspended below the wing.
Instead of the B-36's crew of fifteen, the YB-60's crew numbered only 10.
Production B-60s were to have similar defensive armament to the B-36.
Alexandry2- CLUB
- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:41
Convair YB-60 serial number 49-2676 made its maiden flight on 18 April 1952, piloted by Beryl Erickson.
The Convair aircraft beat the Boeing YB-52 into the air by three days, but it was soon obvious that it would win few other contests against Boeing's bomber.
The YB-60 was approximately 100 mph (160 km/h) slower than the YB-52 and also had severe handling problems.
The Convair aircraft beat the Boeing YB-52 into the air by three days, but it was soon obvious that it would win few other contests against Boeing's bomber.
The YB-60 was approximately 100 mph (160 km/h) slower than the YB-52 and also had severe handling problems.
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- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:43
It did carry a heavier bomb load - 72,000 pounds against 43,000 pounds (20 t) 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 lbs)
(Later "big belly" modifications increased the B-52's bomb load to 60,000 lbs)
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- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:45
Accordingly, the flight test program was canceled on 20 January 1953 with 66 flying hours accumulated, and a second prototype never completed.
The airframe was built, but it was not fitted with engines or much other equipment.
The airframe was built, but it was not fitted with engines or much other equipment.
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- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:47
Since Convair had completed its prototype contract satisfactorily, both the YB-60s were formally accepted by the Air Force in 1954.
The operational aircraft never flew again, and both airframes were scrapped by July.
The operational aircraft never flew again, and both airframes were scrapped by July.
Alexandry2- CLUB
- Messages : 516
Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:49
Specifications (YB-60)
General characteristics
General characteristics
- Crew: 5
- Length: 171 ft (52.1 m)
- [Vous devez être inscrit et connecté pour voir ce lien]: 206 ft (62.8 m)
- Height: 60 ft 6 in (18.4 m)
- Wing area: 5,239 ft² (486.7 m²)
- Empty weight: 153,016 lb (69,407 kg)
- Loaded weight: 160,000 lb (73,000 kg)
- [Vous devez être inscrit et connecté pour voir ce lien]: 300,000 lb (140,000 kg)
- Powerplant: 8× [Vous devez être inscrit et connecté pour voir ce lien]-P-3 [Vous devez être inscrit et connecté pour voir ce lien], 8,700 lbf (38 kN) each
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Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:52
Performance
- [Vous devez être inscrit et connecté pour voir ce lien]: 508 mph (411 knots, 818 km/h) at 29,250 ft (8,915 m)
- [Vous devez être inscrit et connecté pour voir ce lien]: 115 knots (132 mph, 212 km/h)
- [Vous devez être inscrit et connecté pour voir ce lien]: 2,920 mi (2,540 nm, 4,700 km)
- [Vous devez être inscrit et connecté pour voir ce lien]: 8,000 mi (7,000 nm, 13,000 km)
- [Vous devez être inscrit et connecté pour voir ce lien]: 53,300 ft (16,200 m)
- [Vous devez être inscrit et connecté pour voir ce lien]: 1,060 ft/min (5.38 m/s)
- [Vous devez être inscrit et connecté pour voir ce lien]: 31 lb/ft² (150 kg/m²)
- [Vous devez être inscrit et connecté pour voir ce lien]: 0.44
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Re: Convair YB-60
par Alexandry2 Ven 30 Juil 2010, 12:54
References
- [Vous devez être inscrit et connecté pour voir ce lien] Knaack, Marcelle Size (1988). Post-World War II bombers, 1945-1973. Office of Air Force History. [Vous devez être inscrit et connecté pour voir ce lien].
- Jacobsen, Meyers K. and Wagner, Ray. B-36 in Action (Aircraft in Action No.42). Carrollton, TX: Squadron/Signal Publications, Inc., 1980. [Vous devez être inscrit et connecté pour voir ce lien].
- Jones, L.S. U.S. Bombers, B-1 1928 to B-1 1980s. Fallbrook, CA: Aero Publishers, Inc., 1962 (second edition 1974). [Vous devez être inscrit et connecté pour voir ce lien].
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