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Martin XB-48


Jet-Powered Medium Bomber Prototype


United States | 1947



"The Martin XB-48 jet bomber prototype competed unsuccessfully against what would become the Boeing B-47 Stratojet series."



Authored By: Staff Writer | Last Edited: 01/29/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site; No A.I. was used in the generation of this content.
World War 2 (1939-1945) saw the rise of turbojet technology for future military aircraft applications. It became known to the Allies that the Germans were hard at work on potential war-winning jet-powered designs so, to stay in step with the enemy, both the British and the Americans enacted considerable jet aircraft programs of their own. In 1944, American authorities put forth a requirement calling for a jet-powered, medium-class bomber and this led to the emergence of several notable designs of the wartime period.

During this time, the Glen L. Martin Company, a long-time "big aircraft" developer for the United States air service, decided to try its hand at fulfilling the new request. This endeavor became its "XB-48" entry and two prototypes were eventually realized for all of the investment. The design largely followed the wartime forms that Martin was closely associated with, the primary difference being powerplants formed of turbojet technology.

Martin engineers elected for a tubular, streamlined fuselage with a glazed nose section and elevated flight deck slightly aft. The straight wing mainplanes were mid-mounted along the fuselage sides and placed near midships. The tail unit incorporated a single vertical fin with slightly upward-canted horizontal planes. A bicycle undercarriage featuring an inline twin leg arrangement was used with underwing assistance coming from smaller outboard support legs (the XB-48 was the first aircraft to ever feature a "bicycle" undercarriage arrangement). The aircraft would be crewed by at least three, made up of two pilots and a bomber/navigator, and power was to come from 6 x General Electric J35 (Allison J35) turbojet engines developing 3,820 pounds of thrust each. The jets would be fitted into the wing mainplanes as three per wing and a specially-developed, three-engined gondola was devised to help channel airflow around the engines in flight. This assembly gave the external impression of three individual engine nacelles being fitted but this was not the case. The J35 engine became the first axial-flow compressor engine for the United States Army Air Force / Air Force service and eventually powered the later Republic F-84 Thunderjet and Northrop F-89 Scorpion lines.

Dimensions included a length of 26 meters, a wingspan of 33 meters and a height of 8 meters. Armament was headed by an internal load of up to 20,000 pounds of conventional drop stores. Local defense would be provided by 2 x 12.7mm M7 heavy machine guns fitted to a tail turret (this was never fitted).

A first flight was recorded on June 22nd, 1947 and lasted less than an hour. The venture proved a short-lived success as the landing saw all of the undercarriage wheels blow out. However the crew (of two test pilots) were unhurt and the aircraft suffered no catastrophic damage. The test phase became a short one when the USAF cancelled development work on the XB-48. By this time, the grand world war had been over for some years and a massive military drawdown ensued, leaving many designs like the XB-48 out in the lurch. Things for the Martin design were made worse when the USAF focused on the jet-powered, swept-wing Boeing B-47 "Stratojet" bomber instead, the XB-48 essentially acting as insurance should the Boeing program suffer any developmental setbacks. The B-47 also flew for the first time in 1947 and was eventually adopted for service in 1951 - some 2,032 production examples following. When the B-47 proved a surer deal, there left little room for the XB-48 going forward.

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Power & Performance
Those special qualities that separate one aircraft design from another. Performance specifications presented assume optimal operating conditions for the Martin XB-48 Jet-Powered Medium Bomber Prototype.
6 x General Electric J35 turbine engines developing 3,820 lb of thrust each.
Propulsion
522 mph
840 kph | 454 kts
Max Speed
39,403 ft
12,010 m | 7 miles
Service Ceiling
1,802 miles
2,900 km | 1,566 nm
Operational Range
4,200 ft/min
1,280 m/min
Rate-of-Climb
City-to-City Ranges
Operational range when compared to distances between major cities (in KM).
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Structure
The nose-to-tail, wingtip-to-wingtip physical qualities of the Martin XB-48 Jet-Powered Medium Bomber Prototype.
3
(MANNED)
Crew
85.3 ft
26.00 m
O/A Length
108.3 ft
(33.00 m)
O/A Width
26.2 ft
(8.00 m)
O/A Height
58,500 lb
(26,535 kg)
Empty Weight
102,603 lb
(46,540 kg)
MTOW
Design Balance
The three qualities reflected below are altitude, speed, and range. The more full the box, the more balanced the design.
RANGE
ALT
SPEED
Armament
Available supported armament and special-mission equipment featured in the design of the Martin XB-48 Jet-Powered Medium Bomber Prototype .
STANDARD (Proposed):
2 x 12.7mm M7 heavy machine guns in tail turret.

OPTIONAL (Estimated):
Up to 20,000 lb of internally-held conventional drop stores.
Variants
Notable series variants as part of the Martin XB-48 family line.
XB-48 - Base Project Designation; two prototypes completed.
Operators
Global customers who have evaluated and/or operated the Martin XB-48. Nations are displayed by flag, each linked to their respective national aircraft listing.

Total Production: 2 Units

Contractor(s): Glenn L. Martin Company - USA
National flag of the United States

[ United States (cancelled) ]
Relative Max Speed
Hi: 750mph
Lo: 375mph
Aircraft Max Listed Speed (522mph).

Graph Average of 563 MPH.
Era Crossover
Pie graph section
Showcasing Aircraft Era Crossover (if any)
Max Alt Visualization
Small airplane graphic
Production Comparison
2
36183
44000
Entry compared against Ilyushin IL-2 (military) and Cessna 172 (civilian) total production.
MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030
Aviation Timeline
EarlyYrs
WWI
Interwar
WWII
ColdWar
Postwar
Modern
Future
1 / 2
Image of the Martin XB-48
Image from the Public Domain.
2 / 2
Image of the Martin XB-48
Image from the Public Domain.

Mission Roles
Some designs are single-minded in their approach while others offer a more versatile solution to airborne requirements.
GROUND ATTACK
X-PLANE
Recognition
Some designs stand the test of time while others are doomed to never advance beyond the drawing board; let history be their judge.
Going Further...
The Martin XB-48 Jet-Powered Medium Bomber Prototype appears in the following collections:
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