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Hall XPTBH

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This page is a soft redirect.The XPTBH-2 in flight #REDIRECTmw:Help:Magic words#Other
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XPTBH
Role

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This page is a soft redirect. Seaplane torpedo-bomber #REDIRECTmw:Help:Magic words#Other
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Manufacturer

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This page is a soft redirect. Hall Aluminum Aircraft Corporation #REDIRECTmw:Help:Magic words#Other
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First flight

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This page is a soft redirect. February 1937 #REDIRECTmw:Help:Magic words#Other
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Retired

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This page is a soft redirect. September 21, 1938 #REDIRECTmw:Help:Magic words#Other
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Primary user

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This page is a soft redirect. United States Navy #REDIRECTmw:Help:Magic words#Other
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Number built

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This page is a soft redirect. 1 #REDIRECTmw:Help:Magic words#Other
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Program cost

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This page is a soft redirect. $309,000 USD[1] #REDIRECTmw:Help:Magic words#Other
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Type

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This page is a soft redirect. Prototype #REDIRECTmw:Help:Magic words#Other
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Serial

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This page is a soft redirect. 9721[2] #REDIRECTmw:Help:Magic words#Other
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This page is a soft redirect. Fate

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This page is a soft redirect. Destroyed in hurricane
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The Hall XPTBH was a prototype American twin-engined seaplane, submitted to the United States Navy by the Hall Aluminum Aircraft Corporation in response to a 1934 specification for new bomber and scout aircraft. Constructed in an innovative fashion that made extensive use of aluminum, the XPTBH proved successful in flight testing, but failed to win favor with the U.S. Navy. No production contract was awarded, and the single aircraft built served in experimental duties before its destruction in a hurricane during 1938.

Design and development

In late 1934, the U.S. Navy's Bureau of Aeronautics (BuAer) issued a specification for new scout bomber and torpedo bomber designs.[3] Eight companies submitted a total of ten designs in response, evenly split between monoplanes and biplanes.[4][N 1] The Hall Aluminum Aircraft Company submitted the only seaplane design;[4] a single prototype was ordered by the Navy for evaluation on June 30, 1934. Given the designation XPTBH-1,[6] it became the only aircraft to receive three mission-type letters under the U.S. Navy's designation system used between 1922 and 1962.[7][8][9]

Hall's choice of the twin-float seaplane configuration was dictated by the Navy's requirement that the new torpedo-bomber design should be capable of carrying a standard naval torpedo of the type carried by destroyers.[10] As ordered, the XPTBH-1 was intended to be fitted with Wright R-1820 "Cyclone" radial engines;[6] delays in design caused by Hall relocating their production facility, difficulties with the contract, and doubts about the aircraft's performance potential led to a redesign, the aircraft becoming slightly smaller and the engines being changed to a pair of Pratt & Whitney R-1830 "Twin Wasp" radials.[1] The changes to the aircraft resulted in it receiving the revised designation XPTBH-2.[10]

Utilising Hall's standard aluminum tubular spar,[10] the fuselage and wing leading edges were covered in aluminum, while the rest of the wing and the control surfaces were fabric-covered.[10] The aircraft was well-armed defensively by 1930s standards, with a powered turret, designed by Hall, mounted in the nose and carrying a single .30-caliber machine gun.[10] Hand-traversed mountings for a pair of machine guns were fitted in dorsal (top) and ventral (belly) positions aft.[10] An optically flat glass panel was fitted in the nose below the turret for use by the bombardier;[10] the aircraft's offensive weaponry, consisting of a Mark XIII aerial torpedo or, alternatively, up to Script error: No such module "convert". of bombs,[10] was carried in an internal bomb bay, the twin-float arrangement allowing for a clear release of the weaponry.[6]

Operational history

Delivered to the Navy on January 30, 1937,[6][11][N 2] the aircraft was officially presented to the public at Hall's Bristol, Pennsylvania factory in April of that year.[10] The aircraft's early flight testing, starting in February[1] and conducted by test pilot Bill McAvoy,[6][10] showed that the XPTBH had few faults, with the only significant issue being a lack of roll authority – a reduction of the ability of the ailerons to turn the aircraft – as a result of the surface area of the floats.[10] A modification to increase the area of the rudder solved the issue.[10] The aircraft's water-handling characteristics were found to be excellent;[13] the only significant complaints that surfaced during the testing period concerned the XPTBH-2's beaching gear, which was found to be extremely difficult to use in anything other than the calmest water.[13]

Although the XPTBH-2 met most of its design specifications and was rated overall very good in flight testing,[6][13] it failed to meet the contractual requirements for top speed and attack speed.[1] In addition, the U.S. Navy did not consider a seagoing torpedo-bomber to be an aircraft for which there was an operational requirement;[10] the fact that as a floatplane the aircraft was restricted to operation from water was also considered a negative,[5] while the aircraft's "three-in-one" role led it to be viewed as a jack of all trades, purpose-designed aircraft for each role being considered superior.[14] The company, however, blamed Navy politics for the lack of a production order.[13]

Following the conclusion of its test program, the XPTBH-2 was used for experimental duties at the Naval Torpedo Station in Newport, Rhode Island, participating in trials of aerial torpedoes.[1] Its service at Newport came to an end on September 21, 1938, when the XPTBH-2 was destroyed during the Great New England Hurricane.[13] The XPTBH-2 was the last aircraft designed by Hall Aluminum;[10] the company remained in business until 1940, when it was bought out by Consolidated Aircraft.[15][N 3]

Specifications (XPTBH-2)

File:Hall XPTBH-2 on water.png
The XPTBH-2 on the water

Data from Wegg 1990,[6] Trimble 2005,[1] Boyne 2001[13]

General characteristics
  • Crew: four (pilot, copilot/navigator/bombardier, flight mechanic/gunner, radio operator/gunner)
  • Length: Script error: No such module "convert".
  • Wingspan: Script error: No such module "convert".
  • Height: Script error: No such module "convert".
  • Wing area: Script error: No such module "convert".
  • Airfoil: Clark YM[17]
  • Empty weight: Script error: No such module "convert".
  • Gross weight: Script error: No such module "convert".
  • Max takeoff weight: Script error: No such module "convert".
  • Powerplant: 2 × Pratt & Whitney XR-1830-60 radial piston engines, Script error: No such module "convert". each
  • Propellers: 3-bladed Curtiss constant-speed

Performance

  • Maximum speed: Script error: No such module "convert".
  • Cruise speed: Script error: No such module "convert".
  • Range: Script error: No such module "convert".
  • Combat range: Script error: No such module "convert". with torpedo
  • Service ceiling: Script error: No such module "convert". at Script error: No such module "convert". mission weight
  • Time to altitude: 5.3 minutes to Script error: No such module "convert".
  • Wing loading: Script error: No such module "convert".</ul>Armament
  • Guns: 2 x .30-caliber machine guns in nose turret and dorsal position; 1 x .30-cal or .50-cal machine gun in ventral position
  • Bombs: One Mark XIII torpedo or up to Script error: No such module "convert". bombs
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See also

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Aircraft of comparable role, configuration and era

Related lists

References

Notes
  1. ^ The designs submitted, in total, were the Brewster SBA, Curtiss SBC, Douglas TBD, Great Lakes XB2G, Great Lakes XTBG, Grumman XSBF, Hall XPTBH, Northrop BT (which became the SBD Dauntless), Vought SB2U and Vought XSB3U;[4] the XTBD and XTBG were the XPTBH's main competitors.[5]
  2. ^ A Navy source gives December 17, 1936 as the acceptance date.[12]
  3. ^ Deliveries of the Hall PH, a biplane flying boat which first flew in 1929, continued until 1941.[16]
Citations
  1. ^ a b c d e f Trimble 2005, p.14.
  2. ^ Baugher 2011
  3. ^ Dann 1996, p.20.
  4. ^ a b c Doll 1992, p.4.
  5. ^ a b Windrow 1970, pp.28–29.
  6. ^ a b c d e f g Wegg 1990, p.115.
  7. ^ Swanborough and Bowers 1990, p.8.
  8. ^ Kelly and Riley 1997, p.35.
  9. ^ Boyne 2001, p.59.
  10. ^ a b c d e f g h i j k l m n Boyne 2001, p.60.
  11. ^ Wagner 1960, p.335.
  12. ^ Van Fleet et al. 1985, p.90.
  13. ^ a b c d e f Boyne 2001, p.61.
  14. ^ Trimble 1982, p.207.
  15. ^ Pattillo 2000, p.105.
  16. ^ Wegg 1990, p.113.
  17. ^ Lednicer 2010
Bibliography
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External links