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1
Martin XB-48 First Flight
Martin XB-48 First Flight
::2011/10/09::
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2
Martin XB-48
Martin XB-48
::2007/03/29::
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3
HAKA-B 48 - AKB48 Koi Suru Fortune Cookie Dance Cover
HAKA-B 48 - AKB48 Koi Suru Fortune Cookie Dance Cover
::2013/11/12::
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4
B 48 CUP Evacuare Dementa
B 48 CUP Evacuare Dementa
::2009/06/23::
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5
HAKA-B 48 - SKE48 Pareo wa Emerald Dance Cover
HAKA-B 48 - SKE48 Pareo wa Emerald Dance Cover
::2013/11/13::
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6
B 48 CUP - Prin zapadoi
B 48 CUP - Prin zapadoi
::2012/02/18::
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7
Martin XB-51
Martin XB-51
::2009/09/05::
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8
Martin XB 51 bombardero experimental.
Martin XB 51 bombardero experimental.
::2014/01/25::
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9
HAKA-B 48 Banjarmasin.mp4
HAKA-B 48 Banjarmasin.mp4
::2012/09/10::
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10
HAKA-B 48 - Ageta Matsuri - 30 Juni 2013 Kantor BAPPEDA Kal-Sel
HAKA-B 48 - Ageta Matsuri - 30 Juni 2013 Kantor BAPPEDA Kal-Sel
::2013/07/08::
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11
HAKA-B 48 di DutaMall Banjarmasin.mp4
HAKA-B 48 di DutaMall Banjarmasin.mp4
::2012/09/17::
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12
B 48 CUP - Din nou pe Cheia - Babarunca
B 48 CUP - Din nou pe Cheia - Babarunca
::2011/10/09::
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13
Logan B 48 CUP - Carrefour Militari
Logan B 48 CUP - Carrefour Militari
::2012/07/14::
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14
B 48 CUP la Pitesti
B 48 CUP la Pitesti
::2009/03/24::
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15
Martin Xb 51
Martin Xb 51
::2014/04/05::
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16
Martin XB 51
Martin XB 51
::2013/10/29::
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17
VÍDEO 2º CUARTO CAJASOL B 48   C B  UTRERA 23  20 10 13
VÍDEO 2º CUARTO CAJASOL B 48 C B UTRERA 23 20 10 13
::2013/10/20::
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18
Roland JV 1080 - Preset Bank B - 48   Auto 303
Roland JV 1080 - Preset Bank B - 48 Auto 303
::2014/02/22::
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19
WDA Jezza Vs. Rob B. 48
WDA Jezza Vs. Rob B. 48
::2013/11/16::
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20
Mauricio Chaila Campeon Nacional Apertura de Judo - Jujuy 2013 - Final Inf B -48 kgs
Mauricio Chaila Campeon Nacional Apertura de Judo - Jujuy 2013 - Final Inf B -48 kgs
::2013/12/13::
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21
Mr. B 48-piece puzzle on wii
Mr. B 48-piece puzzle on wii
::2010/07/31::
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22
On following strange dogs - Magnificent B - 48 Hours 2013
On following strange dogs - Magnificent B - 48 Hours 2013
::2013/06/05::
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23
B 48 CUP - Indemanare Auto 2012 - Etapa 1
B 48 CUP - Indemanare Auto 2012 - Etapa 1
::2012/05/27::
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24
B 48 C U P - Indemanare auto Baneasa - 21.10.2012
B 48 C U P - Indemanare auto Baneasa - 21.10.2012
::2012/10/21::
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25
Nouali Asseme & the B 48 champion Elliot Whale (3)
Nouali Asseme & the B 48 champion Elliot Whale (3)
::2013/05/25::
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26
mini bomberos Jauja B-48
mini bomberos Jauja B-48
::2012/03/16::
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27
B-48 , student life.
B-48 , student life.
::2011/08/10::
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28
B-48 (財)女性労働協会
B-48 (財)女性労働協会
::2011/12/19::
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29
"Tape For Coach B" (48 Hour Film Project)
"Tape For Coach B" (48 Hour Film Project)
::2012/08/12::
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30
Nouali Asseme & the B 48 champion Elliot Whale (5)
Nouali Asseme & the B 48 champion Elliot Whale (5)
::2013/05/25::
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31
VENTA -  DEPARTAMENTOS URB. SOL DE ICA B-48
VENTA - DEPARTAMENTOS URB. SOL DE ICA B-48
::2012/09/08::
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32
หมาเบลด49 vs ก่าสายB 48
หมาเบลด49 vs ก่าสายB 48
::2014/03/11::
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33
B 48 CUP in gta san andreas
B 48 CUP in gta san andreas
::2011/02/03::
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34
HM III B, 48 VDHM "Herrenabend-Polka"
HM III B, 48 VDHM "Herrenabend-Polka"
::2011/05/28::
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35
B 48 CUP Evacuare Dementa 2
B 48 CUP Evacuare Dementa 2
::2009/06/23::
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36
B 48 Nay tam than
B 48 Nay tam than
::2014/01/09::
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37
WISUDAUNDARIS B 48 2012
WISUDAUNDARIS B 48 2012
::2012/12/12::
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38
Dvorak - Nocturne in B, Op. 40, B. 48 [HD]
Dvorak - Nocturne in B, Op. 40, B. 48 [HD]
::2012/11/03::
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39
48.S.Daniel - B 48 C U P - Indemanare auto Baneasa
48.S.Daniel - B 48 C U P - Indemanare auto Baneasa
::2012/10/21::
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40
on-board B 48 CUP - Locul 1 - Recunoastere
on-board B 48 CUP - Locul 1 - Recunoastere
::2010/07/01::
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41
VIDEO 1º CUARTO CAJASOL CADETE B 48   C B  CAREBA JUNIOR 60  17 9 13
VIDEO 1º CUARTO CAJASOL CADETE B 48 C B CAREBA JUNIOR 60 17 9 13
::2013/09/17::
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42
2014 02 02 rob b 48
2014 02 02 rob b 48
::2014/02/04::
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43
B 48 C U P - Indemanare auto Baneasa
B 48 C U P - Indemanare auto Baneasa
::2012/10/21::
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44
VÍDEO 1º CUARTO  CAJASOL B 48   C B  UTRERA 23  20 10 13
VÍDEO 1º CUARTO CAJASOL B 48 C B UTRERA 23 20 10 13
::2013/10/20::
Play Video
45
Nocturne - Antonin Dvořák Nocturne In B, Op. 40, B 48
Nocturne - Antonin Dvořák Nocturne In B, Op. 40, B 48
::2013/03/21::
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46
B 48 C U P - 21Oct 2012 Baneasa
B 48 C U P - 21Oct 2012 Baneasa
::2012/10/21::
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47
VT BA CAP B 48/50 - Bahia dá Sorte
VT BA CAP B 48/50 - Bahia dá Sorte
::2013/08/18::
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48
Nouali Asseme & the B 48 champion Elliot Whale (2)
Nouali Asseme & the B 48 champion Elliot Whale (2)
::2013/05/25::
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49
AGUSTINOS ERAS 64 CB TORMES B 48-24.3.12
AGUSTINOS ERAS 64 CB TORMES B 48-24.3.12
::2012/03/26::
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50
B 48 CUP - Antrenamente Mai 2012
B 48 CUP - Antrenamente Mai 2012
::2012/05/27::
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RESULTS [51 .. 101]
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XB-48
MartinXB48.jpg
Role Bomber
Manufacturer Glenn L. Martin Company
First flight 22 June 1947
Status Cancelled in 1948
Number built 2
Unit cost
US$11.5 million for the program[1]
Martin XB-48 prototype taxiing, showing spaces between engines for cooling, tandem main gear, & nacelle outriggers.

The Martin XB-48 was a medium jet bomber developed in the mid-1940s. It competed with the Boeing B-47 Stratojet, a clearly superior design, and was seen largely as a backup plan in case the B-47 ran into development problems. It never saw production or active duty, and only two prototypes, serial numbers 45-59585 and 45-59586,[2] were built.

Design and development[edit]

In 1944, the U.S. War Department was aware of aviation advances in Germany and issued a requirement for a range of designs for medium bombers weighing from 80,000 lb (36,287 kg) to more than 200,000 lb (90,718 kg). Other designs resulting from this competition, sometimes named the class of '45, included the North American XB-45 and the Convair XB-46. Production orders finally went to the North American B-45 Tornado, and even this airplane only served for a couple of years before again being replaced by the much more modern Boeing B-47 Stratojet although the B-45 had enough "utility" built in to maintain a niche as reconnaissance aircraft.

In retrospect, the class of '45 were transitional aircraft combining the power of turbojets with the aeronautical knowledge of World War II. The XB-48 was no exception, as its round fuselage and unswept wings show a distinct influence of Martin's B-26 Marauder medium bomber. Still, where the B-26 had enough thrust with two massive 18-cylinder radial engines, the XB-48 needed no less than six of the new jet engines.

Although the pictures make it look like the aircraft has three engine gondolas under each wing, the jet engines were actually clustered in a pair of flat three-engined gondolas with an intricate system of air canals between the engines providing cooling. At the time of the XB-48's design, jet propulsion was clearly still in its infancy.

The XB-48 was the first aircraft designed with bicycle type landing gear, which had previously been tested on a modified B-26. The wing airfoil was too thin to house conventional landing gear mechanisms.[3] The main landing gear was in the fuselage and small outriggers located on each wing were used to balance the aircraft.

Operational history[edit]

The XB-48 made its first flight on 22 June 1947, a 37-minute, 73 mi (117 km) hop from Martin's Baltimore, Maryland plant to NAS Patuxent River, Maryland, but blew all four tires on its fore-and-aft mounted undercarriage on landing when pilot Pat Tibbs applied heavy pressure to the specially-designed, but very slow to respond, insensitive air-braking lever. Tibbs and co-pilot Dutch Gelvin were uninjured.[4]

Video[edit]

Specifications (XB-48)[edit]

Data from "Encyclopedia of US Air Force Aircraft and Missile Systems, Volume II"[5]

General characteristics

  • Crew: 3 (pilot, co-pilot, and bomber-navigator)
  • Length: 85 ft 9 in (26 m)
  • Wingspan: 108 ft 4 in (33 m)
  • Height: 26 ft 6 in (8 m)
  • Wing area: 1,330 ft² (123.5 m²)
  • Empty weight: 58,500 lb (26,535 kg)
  • Loaded weight: 92,600 lb (42,000 kg)
  • Max. takeoff weight: 102,600 lb (46,540 kg)
  • Powerplant: 6 × General Electric J35 axial flow gas-turbine, 3,820 lbf (17 kN) each

Performance

Armament

  • Guns: 2 × .50 in (12.7 mm) M7 machine guns in tail turret (proposed)[3]
  • Bombs: 1 × 20,000 lb (9,980 kg) or 36 × 250 lb (113 kg)

See also[edit]

Aircraft of comparable role, configuration and era
Related lists

References[edit]

Notes
  1. ^ Knaack 1988
  2. ^ "Fact Sheet: Martin XB-48." National Museum of the United States Air Force. Retrieved: 5 July 2010.
  3. ^ a b Jones 1969
  4. ^ Mizrahi 1999, pp. 50–52.
  5. ^ Knaack, Marcelle Size. Encyclopedia of U.S. Air Force Aircraft and Missile Systems: Volume II: Post-World War II Bombers, 1945–1973. Washington, DC: Office of Air Force History, 1988. ISBN 0-16-002260-6.
Bibliography
  • Jones, Lloyd S. U.S. Bombers, B-1 1928 to B-1 1980s. Fallbrook, CA: Aero Publishers, 1962, second edition 1974. ISBN 0-8168-9126-5.
  • Mizrahi, Joe. "The Last Great Bomber Fly Off". Wings, Volume 29, Number 3, June 1999.

External links[edit]

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