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aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 11:51
Le Martin P6M sur Wikipedia.en
[Vous devez être inscrit et connecté pour voir ce lien]
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The Martin P6M SeaMaster, built by the [Vous devez être inscrit et connecté pour voir ce lien], was a 1950s [Vous devez être inscrit et connecté pour voir ce lien] for the [Vous devez être inscrit et connecté pour voir ce lien] that almost entered service; production aircraft had been built and Navy crews were undergoing
operational conversion, with a service entry about six months off, when the program was cancelled on August 21, 1959.
Envisioned as a way to give the Navy a strategic nuclear force, the SeaMaster was eclipsed by the [Vous devez être inscrit et connecté pour voir ce lien] submarine
launched ballistic missile.
Due to the political situation at the Pentagon, the Navy promoted the P6M primarily as a high speed minelayer.
[Vous devez être inscrit et connecté pour voir ce lien]
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The Martin P6M SeaMaster, built by the [Vous devez être inscrit et connecté pour voir ce lien], was a 1950s [Vous devez être inscrit et connecté pour voir ce lien] for the [Vous devez être inscrit et connecté pour voir ce lien] that almost entered service; production aircraft had been built and Navy crews were undergoing
operational conversion, with a service entry about six months off, when the program was cancelled on August 21, 1959.
Envisioned as a way to give the Navy a strategic nuclear force, the SeaMaster was eclipsed by the [Vous devez être inscrit et connecté pour voir ce lien] submarine
launched ballistic missile.
Due to the political situation at the Pentagon, the Navy promoted the P6M primarily as a high speed minelayer.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 11:53
Design and development
In the immediate postwar defense climate, the [Vous devez être inscrit et connecté pour voir ce lien]'s [Vous devez être inscrit et connecté pour voir ce lien] was the linchpin of the United States' security as the sole means of delivery of the nation's nuclear arsenal.
The Navy saw its strategic role being eclipsed by the Air Force and knew both its prestige and budgets were at stake.
Its first attempt, the [Vous devez être inscrit et connecté pour voir ce lien], a large 'super carrier' to launch Navy strategic bombers from, having been a
victim of budget cuts, the Navy chose instead to create a "Seaplane Striking Force" useful for both nuclear and conventional warfare, including reconnaissance and minelaying.
In the immediate postwar defense climate, the [Vous devez être inscrit et connecté pour voir ce lien]'s [Vous devez être inscrit et connecté pour voir ce lien] was the linchpin of the United States' security as the sole means of delivery of the nation's nuclear arsenal.
The Navy saw its strategic role being eclipsed by the Air Force and knew both its prestige and budgets were at stake.
Its first attempt, the [Vous devez être inscrit et connecté pour voir ce lien], a large 'super carrier' to launch Navy strategic bombers from, having been a
victim of budget cuts, the Navy chose instead to create a "Seaplane Striking Force" useful for both nuclear and conventional warfare, including reconnaissance and minelaying.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:02
The requirement, issued in April [Vous devez être inscrit et connecté pour voir ce lien], was for a seaplane able to carry 30,000 lb (13,600 kg) of bombs to a target 1,500 miles (2,400 km) away from its aquatic base.
The aircraft had to be capable of a low altitude attack run at [Vous devez être inscrit et connecté pour voir ce lien] 0.9 (1,100 km/h), which required an extremely capable aircraft.
Both [Vous devez être inscrit et connecté pour voir ce lien] and Martin submitted proposals, and the Martin one was chosen as more promising.
The aircraft had to be capable of a low altitude attack run at [Vous devez être inscrit et connecté pour voir ce lien] 0.9 (1,100 km/h), which required an extremely capable aircraft.
Both [Vous devez être inscrit et connecté pour voir ce lien] and Martin submitted proposals, and the Martin one was chosen as more promising.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:06
An order for two prototypes was issued, which was projected to lead to six pre-production aircraft and a projected twenty-four production planes.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:13
Originally the plane was to have a Curtiss-Wright turbo-[Vous devez être inscrit et connecté pour voir ce lien] engine, but this ran into problems and a more conventional [Vous devez être inscrit et connecté pour voir ce lien] turbojet was employed, fitted in pairs in overwing pods to keep the spray out of the intakes.
Wings swept at 40° were used; they displayed a notable [Vous devez être inscrit et connecté pour voir ce lien] (downward slope to the tip) and were designed with tip tanks that doubled as floats on the water.
Many features of Martin's [Vous devez être inscrit et connecté pour voir ce lien] bomber prototype were used, including an [Vous devez être inscrit et connecté pour voir ce lien] and a rotating [Vous devez être inscrit et connecté pour voir ce lien]—pneumatically sealed against seawater in the P6M.
Wings swept at 40° were used; they displayed a notable [Vous devez être inscrit et connecté pour voir ce lien] (downward slope to the tip) and were designed with tip tanks that doubled as floats on the water.
Many features of Martin's [Vous devez être inscrit et connecté pour voir ce lien] bomber prototype were used, including an [Vous devez être inscrit et connecté pour voir ce lien] and a rotating [Vous devez être inscrit et connecté pour voir ce lien]—pneumatically sealed against seawater in the P6M.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:15
Operational history
First flight of the XP6M-1 came on 14 July [Vous devez être inscrit et connecté pour voir ce lien], but early tests showed that the engines were mounted too closely to the fuselage and scorched it when afterburners were used, leading to pointing the engines a little outward in subsequent aircraft.
Flight testing was initially successful but on 7 December 1955 a control system fault destroyed the first prototype with the loss of all aboard.
First flight of the XP6M-1 came on 14 July [Vous devez être inscrit et connecté pour voir ce lien], but early tests showed that the engines were mounted too closely to the fuselage and scorched it when afterburners were used, leading to pointing the engines a little outward in subsequent aircraft.
Flight testing was initially successful but on 7 December 1955 a control system fault destroyed the first prototype with the loss of all aboard.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:17
The first prototype, BuNo 138821, c/n XP-1, disintegrated in flight at 5,000 feet due to horizontal tail going to full up in control malfunction, subjecting airframe to 9 G stress as it began an outside loop, crashing into [Vous devez être inscrit et connecté pour voir ce lien] near junction of [Vous devez être inscrit et connecté pour voir ce lien], killing four crew: pilot Navy Lieutenant Commander Utgoff, and Martin employees, Morris
Bernhard, assistant pilot, Herbert Scudder, flight engineer, and H.B. Coulon, flight test engineer.
Bernhard, assistant pilot, Herbert Scudder, flight engineer, and H.B. Coulon, flight test engineer.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:20
Eleven months later, on 9 November 1956, the second prototype, BuNo 138822, c/n XP-2, first flown May 18, 1956, was also destroyed, due to Martin's making a change in the horizontal stabilizer control system design without adequate evaluation before test flying the "fix," crashing at 1536 hrs. near [Vous devez être inscrit et connecté pour voir ce lien] due to a faulty elevator jack.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:23
The first pre-production YP6M-1 was completed about a year later, with testing resuming in January [Vous devez être inscrit et connecté pour voir ce lien].
Five more were built in 1958 when the Navy announced that [Vous devez être inscrit et connecté pour voir ce lien] in Hertford, North Carolina, would serve as the testing grounds for the fleet of Martin P6M Seamasters.
Five more were built in 1958 when the Navy announced that [Vous devez être inscrit et connecté pour voir ce lien] in Hertford, North Carolina, would serve as the testing grounds for the fleet of Martin P6M Seamasters.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:24
These aircraft were fitted with test versions of the full combat equipment suite and were used for bombing, minelaying and reconnaissance evaluations.
The P6M-1 test program was mostly successful, however the J71 engines proved far less reliable than required.
The P6M-1 also had spray ingestion problems at gross weight which would preclude takeoffs except under ideal conditions.
The P6M-1 test program was mostly successful, however the J71 engines proved far less reliable than required.
The P6M-1 also had spray ingestion problems at gross weight which would preclude takeoffs except under ideal conditions.
Owitzer- Messages : 969
Re: Martin P6M SeaMaster
par Owitzer Mer 07 Juil 2010, 12:31
The P6M-1 also had a serious control deficiency due to porpoising under some trim settings.These deficiencies resulted in the P6M-1 program being cut as it was no longer considered possible for it to be a successful asset.
The P6M-1 had been generally successful, the airplane was designed to meet an incredibly demanding set of specifications and had mostly achieved them.
The P6M-1 had been generally successful, the airplane was designed to meet an incredibly demanding set of specifications and had mostly achieved them.
Owitzer- Messages : 969
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