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aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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Re: Boeing B-52 Stratofortress
par Peewee Jeu 15 Avr 2010, 22:47
Ongoing problems with advanced avionics were addressed in the Jolly Well program, completed in 1964, which improved components of the AN/ASQ-38 bombing navigational computer and the terrain computer.
The MADREC (Malfunction Detection and Recording) upgrade fitted to most aircraft by 1965 could detect failures in avionics and weapons computer systems, and was essential in monitoring the Hound Dog missiles.
The [Vous devez être inscrit et connecté pour voir ce lien] capability of the B-52 was expanded with Rivet Rambler (1971) and Rivet Ace (1973).
The MADREC (Malfunction Detection and Recording) upgrade fitted to most aircraft by 1965 could detect failures in avionics and weapons computer systems, and was essential in monitoring the Hound Dog missiles.
The [Vous devez être inscrit et connecté pour voir ce lien] capability of the B-52 was expanded with Rivet Rambler (1971) and Rivet Ace (1973).
Peewee- CLUB
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Re: Boeing B-52 Stratofortress
par Peewee Jeu 15 Avr 2010, 22:49
To improve safe day and night operations at low altitude, the AN/ASQ-151 Electro-Optical Viewing System (EVS), consisting of a [Vous devez être inscrit et connecté pour voir ce lien] (LLLTV) and a [Vous devez être inscrit et connecté pour voir ce lien] (FLIR) system mounted in blisters under the noses of B-52Gs and Hs between 1972 and 1976.
To further improve the B-52's offensive ability, it was fitted with Air Launched Cruise Missiles (ALCMs).
After testing of both the Air Force backed [Vous devez être inscrit et connecté pour voir ce lien] and the Navy backed [Vous devez être inscrit et connecté pour voir ce lien], the AGM-86B was selected for operation by the B-52 (and ultimately by the B-1 Lancer).
To further improve the B-52's offensive ability, it was fitted with Air Launched Cruise Missiles (ALCMs).
After testing of both the Air Force backed [Vous devez être inscrit et connecté pour voir ce lien] and the Navy backed [Vous devez être inscrit et connecté pour voir ce lien], the AGM-86B was selected for operation by the B-52 (and ultimately by the B-1 Lancer).
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Re: Boeing B-52 Stratofortress
par Peewee Jeu 15 Avr 2010, 22:52
A total of 194 B-52Gs and Hs were modified to carry AGM-86s, carrying 12 missiles on underwing pylons, with 82 B-52Hs further modified to carry another eight missiles on a rotary launcher fitted in the aircraft's bomb-bay.
To conform with the requirements of the [Vous devez être inscrit et connecté pour voir ce lien] for cruise missile capable aircraft to be readily identified by reconnaissance satellites, the cruise missile armed B-52Gs were modified with a distinctive wing root fairing.
As all B-52Hs were assumed to be modified, no visual modification of these aircraft was required.
[Vous devez être inscrit et connecté pour voir ce lien]
To conform with the requirements of the [Vous devez être inscrit et connecté pour voir ce lien] for cruise missile capable aircraft to be readily identified by reconnaissance satellites, the cruise missile armed B-52Gs were modified with a distinctive wing root fairing.
As all B-52Hs were assumed to be modified, no visual modification of these aircraft was required.
[Vous devez être inscrit et connecté pour voir ce lien]
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Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 10:54
In 1990, the stealthy [Vous devez être inscrit et connecté pour voir ce lien] cruise missile entered service.
Although originally intended to replace the AGM-86 its high cost and the end of the Cold War stopped production after only 450 were made.
Unlike the AGM-86, no conventional (that is, non-nuclear) armed version was built.
Although originally intended to replace the AGM-86 its high cost and the end of the Cold War stopped production after only 450 were made.
Unlike the AGM-86, no conventional (that is, non-nuclear) armed version was built.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 10:57
[Vous devez être inscrit et connecté pour voir ce lien], exacerbated by the change to low-altitude missions, was first dealt with in the early 1960s by the three-phase High Stress program which enrolled aircraft at 2,000 flying hours.
This was followed by a 2,000-hour service life extension to select airframes in 1966-1968, and the extensive Pacer Plank reskinning completed in 1977.
This was followed by a 2,000-hour service life extension to select airframes in 1966-1968, and the extensive Pacer Plank reskinning completed in 1977.
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Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:00
The [Vous devez être inscrit et connecté pour voir ce lien] introduced on G and H models was even more susceptible to fatigue due to experiencing 60% more stress during flight than the old wing.
The wings were modified by 1964 under ECP 1050.
This was followed by a fuselage skin and [Vous devez être inscrit et connecté pour voir ce lien] replacement (ECP 1185) in 1966, and B-52 Stability Augmentation and Flight Control program (ECP 1195) in 1967.
The wings were modified by 1964 under ECP 1050.
This was followed by a fuselage skin and [Vous devez être inscrit et connecté pour voir ce lien] replacement (ECP 1185) in 1966, and B-52 Stability Augmentation and Flight Control program (ECP 1195) in 1967.
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- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:01
Boeing has suggested re-engining the B-52H fleet with the [Vous devez être inscrit et connecté pour voir ce lien].
This would involve replacing the eight [Vous devez être inscrit et connecté pour voir ce lien] (total thrust 8 × 17,000 lb) with four RB211s (total thrust 4× 37,400 lb).
The RR engines will increase the range and payload of the fleet and reduce fuel consumption.
This would involve replacing the eight [Vous devez être inscrit et connecté pour voir ce lien] (total thrust 8 × 17,000 lb) with four RB211s (total thrust 4× 37,400 lb).
The RR engines will increase the range and payload of the fleet and reduce fuel consumption.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:04
However, the cost of the project would be significant.
Procurement would cost approximately US$2.56 billion (US$36 million × 71 aircraft).
A [Vous devez être inscrit et connecté pour voir ce lien] study of the proposal concluded that Boeing's estimated savings of US$4.7 billion would not be realized and found that it would cost US$1.3 billion over keeping the existing engines.
Procurement would cost approximately US$2.56 billion (US$36 million × 71 aircraft).
A [Vous devez être inscrit et connecté pour voir ce lien] study of the proposal concluded that Boeing's estimated savings of US$4.7 billion would not be realized and found that it would cost US$1.3 billion over keeping the existing engines.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:06
The higher cost was blamed on significant up-front procurement expenditure, necessary re-tooling, and the RB211's higher maintenance cost.
The GAO report was subsequently disputed in a Defense Sciences Board report in 2003 and revised in 2004 that identified numerous errors in the prior evaluation of the Boeing proposal, and urged the Air Force to re-engine the aircraft without delay.
The GAO report was subsequently disputed in a Defense Sciences Board report in 2003 and revised in 2004 that identified numerous errors in the prior evaluation of the Boeing proposal, and urged the Air Force to re-engine the aircraft without delay.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:07
Further, the DSB report stated the program would save substantial funds, reduce greenhouse gas emissions, and increase aircraft range and endurance, duplicating the results of a Congressionally funded US$3M program office study conducted in 2003.
However, the re-engining has not been approved as of 2009.
However, the re-engining has not been approved as of 2009.
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- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:09
In 2007 the [Vous devez être inscrit et connecté pour voir ce lien] was fitted and commissioned increasing the combat effectiveness of the aircraft during day, night and under-the-weather conditions in the attack of ground targets with a variety of standoff weapons under the guidance of [Vous devez être inscrit et connecté pour voir ce lien] and the help of high resolution forward-looking infrared sensor ([Vous devez être inscrit et connecté pour voir ce lien]) for visual display in the infrared portion of the electromagnetic spectrum and [Vous devez être inscrit et connecté pour voir ce lien] (CCD-TV) camera used to obtain target imagery in the visible portion,
this technology could also be used in real-time transmission to ground communications networks and government agencies to gather battlefield intelligence, assess battlefield damage, assess terrorist activities and counter drug activity, further advancing the B-52H's capabilities and uses.
this technology could also be used in real-time transmission to ground communications networks and government agencies to gather battlefield intelligence, assess battlefield damage, assess terrorist activities and counter drug activity, further advancing the B-52H's capabilities and uses.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:12
Fuel research platform
In September 2006, the B-52 became one of the first US military aircraft to fly using 'alternative' fuel.
[Vous devez être inscrit et connecté pour voir ce lien] Corporation, a leader in [Vous devez être inscrit et connecté pour voir ce lien] (FT) technology, announced that its Ultra-Clean jet fuel was successfully tested in a B-52.
It took off from [Vous devez être inscrit et connecté pour voir ce lien] with a 50/50 blend of FT and traditional [Vous devez être inscrit et connecté pour voir ce lien] jet fuel which was burned in two of the eight engines on the aircraft.
This marked the first time that FT jet fuel was tested in a military flight demo, and is the first of several planned test flights.
In September 2006, the B-52 became one of the first US military aircraft to fly using 'alternative' fuel.
[Vous devez être inscrit et connecté pour voir ce lien] Corporation, a leader in [Vous devez être inscrit et connecté pour voir ce lien] (FT) technology, announced that its Ultra-Clean jet fuel was successfully tested in a B-52.
It took off from [Vous devez être inscrit et connecté pour voir ce lien] with a 50/50 blend of FT and traditional [Vous devez être inscrit et connecté pour voir ce lien] jet fuel which was burned in two of the eight engines on the aircraft.
This marked the first time that FT jet fuel was tested in a military flight demo, and is the first of several planned test flights.
Peewee- CLUB
- Messages : 761
Re: Boeing B-52 Stratofortress
par Peewee Ven 16 Avr 2010, 11:15
On 15 December 2006, tail number 61-0034, Checkmate took off from Edwards with the synthetic fuel blend powering all eight engines, the first time an Air Force aircraft was completely powered by the mixture.
The test flight was captained by Major General Curtis Bedke, commander of the Edwards Flight Test Center, the first time in 36 years that the installation's commander performed a first flight in a flight test program.
The flight lasted seven hours, reached an altitude of 48,000 feet, and was considered a success.
The test flight was captained by Major General Curtis Bedke, commander of the Edwards Flight Test Center, the first time in 36 years that the installation's commander performed a first flight in a flight test program.
The flight lasted seven hours, reached an altitude of 48,000 feet, and was considered a success.
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