SPONSORED VIDEO
Play Video
1
Martin XB-48 First Flight
Martin XB-48 First Flight
::2011/10/08::
Play Video
2
Martin XB-48
Martin XB-48
::2007/03/29::
Play Video
3
Martin XB 51 bombardero experimental.
Martin XB 51 bombardero experimental.
::2014/01/25::
Play Video
4
Martin XB-51
Martin XB-51
::2009/09/05::
Play Video
5
Martin Xb 51
Martin Xb 51
::2014/04/05::
Play Video
6
Martin XB-51
Martin XB-51
::2014/04/30::
Play Video
7
Jet Bomber Takes The Air (1949)
Jet Bomber Takes The Air (1949)
::2014/04/13::
Play Video
8
Us Bomber On Test Bed (1947)
Us Bomber On Test Bed (1947)
::2014/04/13::
Play Video
9
vcd2006_OW_May.mpg
vcd2006_OW_May.mpg
::2011/10/21::
Play Video
10
Forgotten Aircraft - The Douglas XB-19
Forgotten Aircraft - The Douglas XB-19
::2007/06/09::
Play Video
11
XB 51 Martin
XB 51 Martin
::2014/02/02::
Play Video
12
Convair XB-36H "Crusader" Progress Report - 1956
Convair XB-36H "Crusader" Progress Report - 1956
::2014/06/08::
Play Video
13
Douglas XB-19 First Flight (1941)
Douglas XB-19 First Flight (1941)
::2012/04/16::
Play Video
14
Douglas XB-42 Mixmaster Experimental Aircraft
Douglas XB-42 Mixmaster Experimental Aircraft
::2012/04/28::
Play Video
15
HermitCraft ~ ModSauce ~ Ep 48 ~ Rocket Man!
HermitCraft ~ ModSauce ~ Ep 48 ~ Rocket Man!
::2014/10/14::
Play Video
16
XB-46 takeoff
XB-46 takeoff
::2007/03/29::
Play Video
17
Fabio XB featuring Adina Butar - Stay (Anske Remix) (GDJB Rip) HD
Fabio XB featuring Adina Butar - Stay (Anske Remix) (GDJB Rip) HD
::2014/09/27::
Play Video
18
Convair XB-46 First Flight, April 2, 1947
Convair XB-46 First Flight, April 2, 1947
::2011/08/15::
Play Video
19
Douglas XB-42 Mixmaster
Douglas XB-42 Mixmaster
::2009/05/03::
Play Video
20
Boeing XB-52 Stratofortress (1952)
Boeing XB-52 Stratofortress (1952)
::2011/09/22::
Play Video
21
XB-24 Liberator First Flight
XB-24 Liberator First Flight
::2010/06/30::
Play Video
22
Douglas XB 43
Douglas XB 43
::2013/01/15::
Play Video
23
Fabio XB - Atom (From:
Fabio XB - Atom (From: 'W&W - Mainstage vol. 1')
::2012/09/08::
Play Video
24
RARE PLANES IN FLIGHT. XB 19 (facsimile) FOOTAGE. (with stupid music)
RARE PLANES IN FLIGHT. XB 19 (facsimile) FOOTAGE. (with stupid music)
::2013/05/18::
Play Video
25
North American XB-45 Tornado First Flight, March 17, 1947
North American XB-45 Tornado First Flight, March 17, 1947
::2011/08/10::
Play Video
26
North American XB-70 Valkyrie SST
North American XB-70 Valkyrie SST
::2010/01/20::
Play Video
27
Martin 404 despegando
Martin 404 despegando
::2007/08/12::
Play Video
28
Douglas XB 42 Mixmaster
Douglas XB 42 Mixmaster
::2013/01/13::
Play Video
29
BIG-O Multimedia Show in Yeosu International Expo, South Korea, 2012
BIG-O Multimedia Show in Yeosu International Expo, South Korea, 2012
::2013/06/10::
Play Video
30
Global hawk XB-47 X-48 UCAV Edwards airshow
Global hawk XB-47 X-48 UCAV Edwards airshow
::2009/11/07::
Play Video
31
FSX Acceleration NASA XB-70 Valkyrie Package addon (with download link) by united4games
FSX Acceleration NASA XB-70 Valkyrie Package addon (with download link) by united4games
::2014/10/11::
Play Video
32
XB and Le Saux - Overture of Angels (Angels Mix)
XB and Le Saux - Overture of Angels (Angels Mix)
::2013/09/19::
Play Video
33
Martin P6M SeaMaster | Top Secret Weapons Revealed
Martin P6M SeaMaster | Top Secret Weapons Revealed
::2012/09/06::
Play Video
34
Cold Warrior (XB-47 #2--46-066)
Cold Warrior (XB-47 #2--46-066)
::2013/08/07::
Play Video
35
A US Air Force Boeing XB 52 Stratofortress Bomber takes off and lands in the Unit...HD Stock Footage
A US Air Force Boeing XB 52 Stratofortress Bomber takes off and lands in the Unit...HD Stock Footage
::2014/06/04::
Play Video
36
YB-60 Taxies Out
YB-60 Taxies Out
::2007/05/09::
Play Video
37
Martin YP6M SeaMaster
Martin YP6M SeaMaster
::2008/12/15::
Play Video
38
Martin Garrix - Animals (Broning Bootleg) ASOT 635 ★★★【MUSIC VIDEO ToJ edit】★★★
Martin Garrix - Animals (Broning Bootleg) ASOT 635 ★★★【MUSIC VIDEO ToJ edit】★★★
::2013/10/17::
Play Video
39
Grand Theft Auto V végigjátszás 33. - X+B baromkodás
Grand Theft Auto V végigjátszás 33. - X+B baromkodás
::2013/10/15::
Play Video
40
Boeing XB-47 Stratojet Bomber 221029-15.mp4
Boeing XB-47 Stratojet Bomber 221029-15.mp4
::2011/09/17::
Play Video
41
B-45 Tornado takeoff
B-45 Tornado takeoff
::2007/03/29::
Play Video
42
Martin 187 Baltimore
Martin 187 Baltimore
::2013/09/25::
Play Video
43
Martin 4-0-4
Martin 4-0-4
::2008/08/23::
Play Video
44
Martin B-57 Canberra Documentary (Part 2)
Martin B-57 Canberra Documentary (Part 2)
::2009/06/18::
Play Video
45
XB-502 E-Bike Mods and Accessories
XB-502 E-Bike Mods and Accessories
::2011/07/07::
Play Video
46
Oliver Heldens X Becky Hill - Gecko (Overdrive) [Official Video]
Oliver Heldens X Becky Hill - Gecko (Overdrive) [Official Video]
::2014/05/20::
Play Video
47
XB Strange- Quarter Juice & Funyuns[Prod. By Keith
XB Strange- Quarter Juice & Funyuns[Prod. By Keith
::2011/10/09::
Play Video
48
Martin P6M SeaMaster Flying Boat Pictures
Martin P6M SeaMaster Flying Boat Pictures
::2012/04/22::
Play Video
49
Convair B-58A Model in Supersonic Pressure Tunnel circa 1954 NACA - NASA Langley Research Center
Convair B-58A Model in Supersonic Pressure Tunnel circa 1954 NACA - NASA Langley Research Center
::2013/01/27::
Play Video
50
Martin B-57 Canberra (1956)
Martin B-57 Canberra (1956)
::2010/09/13::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
Jump to: navigation, search
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]

Wikipedia content is licensed under the GFDL License
Powered by YouTube
MASHPEDIA
LEGAL
  • Mashpedia © 2015