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Peewee
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aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:19
This program is part of the [Vous devez être inscrit et connecté pour voir ce lien] Assured Fuel Initiative, an effort to develop secure domestic sources
for the military energy needs.
The Pentagon hopes to reduce its use of crude oil from foreign producers and obtain about half of its aviation fuel from alternative sources by 2016.
for the military energy needs.
The Pentagon hopes to reduce its use of crude oil from foreign producers and obtain about half of its aviation fuel from alternative sources by 2016.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:20
With the B-52 now approved to use the FT blend, the USAF will use the test protocols developed during the program to certify the [Vous devez être inscrit et connecté pour voir ce lien] and then the [Vous devez être inscrit et connecté pour voir ce lien] to use the fuel (the first B-1 test flight took place in March, 2008).
The Air Force intends to test and certify every airframe in its inventory to use the fuel by 2011.
The Air Force intends to test and certify every airframe in its inventory to use the fuel by 2011.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:30
Costs
The costs are in approximate 1955 [Vous devez être inscrit et connecté pour voir ce lien] and have not been adjusted for inflation.
------------------------------------------X/YB-52-------B-52A------B-52B------B-52C------B-52D------B-52E------B-52F------B-52G------B-52H
The costs are in approximate 1955 [Vous devez être inscrit et connecté pour voir ce lien] and have not been adjusted for inflation.
------------------------------------------X/YB-52-------B-52A------B-52B------B-52C------B-52D------B-52E------B-52F------B-52G------B-52H
| Unit [Vous devez être inscrit et connecté pour voir ce lien] cost | 100 million | ||||||||
| Airframe | 26,433,518 | 11,328,398 | 5,359,017 | 4,654,494 | 3,700,750 | 3,772,247 | 5,351,819 | 6,076,157 | |
| Engines | 2,848,120 | 2,547,472 | 1,513,220 | 1,291,415 | 1,256,516 | 1,787,191 | 1,427,611 | 1,640,373 | |
| Electronics | 50,761 | 61,198 | 71,397 | 68,613 | 54,933 | 60,111 | 66,374 | 61,020 | |
| Armament | 47,874 | 482,284 | 293,346 | 548,353 | 931,665 | 862,839 | 840,000 | 1,501,422 | |
| Ordnance | 9,193 | 11,520 | 10,983 | 17,928 | 4,626 | 3,016 | 6,809 | 6,804 | |
| Flyaway cost | 28,380,000 | 14,430,000 | 7,240,000 | 6,580,000 | 5,940,000 | 6,480,000 | 7,690,000 | 9,290,000 | |
| Maintenance cost per flying hour | 925 | 1,025 | 1,025 | 1,182 |
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:16
Operational history
Although the B-52A was the first production variant, these aircraft were used only in testing.
The first operational version was the B-52B which was developed in parallel with the prototypes since 1951.
First flying in December 1954, B-52B, AF Serial Number 52-8711, entered operational service with 93rd Heavy
Bombardment Wing at [Vous devez être inscrit et connecté pour voir ce lien], [Vous devez être inscrit et connecté pour voir ce lien], on 29 June 1955.
Although the B-52A was the first production variant, these aircraft were used only in testing.
The first operational version was the B-52B which was developed in parallel with the prototypes since 1951.
First flying in December 1954, B-52B, AF Serial Number 52-8711, entered operational service with 93rd Heavy
Bombardment Wing at [Vous devez être inscrit et connecté pour voir ce lien], [Vous devez être inscrit et connecté pour voir ce lien], on 29 June 1955.
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Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:19
The wing became operational on 12 March 1956. The training for B-52 crews consisted of five weeks of ground school and four weeks of flying, accumulating 35–50 hours in the air.
The new B-52Bs replaced operational B-36s on a one-to-one basis.
The new B-52Bs replaced operational B-36s on a one-to-one basis.
Peewee- CLUB
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Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:26
Early operations were complicated by lack of spares and ground facilities while ramps and taxiways deteriorated under the weight of the aircraft.
The fuel system was prone to leaks and icing, and bombing and fire control computers were unreliable.
The two-story cockpit presented a unique climate control problem – the pilots' cockpit was heated by sunlight while the observer and the navigator on the bottom deck sat on the ice cold floor.
The fuel system was prone to leaks and icing, and bombing and fire control computers were unreliable.
The two-story cockpit presented a unique climate control problem – the pilots' cockpit was heated by sunlight while the observer and the navigator on the bottom deck sat on the ice cold floor.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:29
Thus, comfortable temperature setting for the pilots caused the other crew members to freeze, while comfortable temperature for the bottom crew caused the pilots to overheat.
The J57 engines were still new and unreliable.
[Vous devez être inscrit et connecté pour voir ce lien] failure caused the first fatal B-52 crash in February 1956, which resulted in a brief grounding of the fleet.
In July, fuel and hydraulic system problems again grounded the B-52s.
To avoid maintenance problems, the Air Force set up Sky Speed teams of 50 maintenance contractors at each B-52 base.
In addition to maintenance, the teams performed routine checkups which took one week per aircraft.
The J57 engines were still new and unreliable.
[Vous devez être inscrit et connecté pour voir ce lien] failure caused the first fatal B-52 crash in February 1956, which resulted in a brief grounding of the fleet.
In July, fuel and hydraulic system problems again grounded the B-52s.
To avoid maintenance problems, the Air Force set up Sky Speed teams of 50 maintenance contractors at each B-52 base.
In addition to maintenance, the teams performed routine checkups which took one week per aircraft.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:31
On 21 May 1956, a B-52B (52-0013) dropped its first live [Vous devez être inscrit et connecté pour voir ce lien] (a [Vous devez être inscrit et connecté pour voir ce lien]) over the [Vous devez être inscrit et connecté pour voir ce lien].
On 24–25 November 1956, four B-52Bs of the 93rd BW and four B-52Cs of the 42nd BW flew nonstop around the perimeter of North America in Operation Quick Kick, covering 15,530 miles (13,500 nm, 25,000 km) in 31 hours 30 minutes.
SAC noted that the flight time could have been reduced by 5–6 hours if the four inflight refuellings were done by fast
jet-powered tanker aircraft rather than propeller-driven [Vous devez être inscrit et connecté pour voir ce lien].
On 24–25 November 1956, four B-52Bs of the 93rd BW and four B-52Cs of the 42nd BW flew nonstop around the perimeter of North America in Operation Quick Kick, covering 15,530 miles (13,500 nm, 25,000 km) in 31 hours 30 minutes.
SAC noted that the flight time could have been reduced by 5–6 hours if the four inflight refuellings were done by fast
jet-powered tanker aircraft rather than propeller-driven [Vous devez être inscrit et connecté pour voir ce lien].
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:34
In a demonstration of the B-52s global reach, on 16–18 January 1957, three B-52Bs made a nonstop flight around the world during [Vous devez être inscrit et connecté pour voir ce lien], covering 24,325 miles (21,145 nm, 39,165 km) in 45 hours 19 minutes (536.8 smph) with several in-flight refuelings by KC-97s.
The 93rd Bomb Wing received the [Vous devez être inscrit et connecté pour voir ce lien] for their accomplishment.
The 93rd Bomb Wing received the [Vous devez être inscrit et connecté pour voir ce lien] for their accomplishment.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:36
The B-52 set many records over the next few years. On 26 September 1958, a B-52D set a world speed record of 560.705 miles per hour (487 kn, 902 km/h) over a 10,000 kilometers (5,400 nm, 6,210 mi) closed circuit without a payload.
The same day, another B-52D established a world speed record of 597.675 miles per hour (519 kn, 962 km/h) over a
5,000 kilometer (2,700 nmi, 3,105 mi) closed circuit without a payload.
The same day, another B-52D established a world speed record of 597.675 miles per hour (519 kn, 962 km/h) over a
5,000 kilometer (2,700 nmi, 3,105 mi) closed circuit without a payload.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 12:38
On 14 December 1960, a B-52G set a world record by flying unrefueled for 10,078.84 miles (8,762 nm, 16,227 km).
The flight lasted 19 hours 44 minutes (510.75 mph).
On 10–11 January 1962, a B-52H set a world record by flying unrefuelled from [Vous devez être inscrit et connecté pour voir ce lien], [Vous devez être inscrit et connecté pour voir ce lien], Japan, to [Vous devez être inscrit et connecté pour voir ce lien], Spain, covering 12,532.28 miles (10,895 nmi, 20,177 km).
The flight lasted 19 hours 44 minutes (510.75 mph).
On 10–11 January 1962, a B-52H set a world record by flying unrefuelled from [Vous devez être inscrit et connecté pour voir ce lien], [Vous devez être inscrit et connecté pour voir ce lien], Japan, to [Vous devez être inscrit et connecté pour voir ce lien], Spain, covering 12,532.28 miles (10,895 nmi, 20,177 km).
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