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United States' Martin 187 Baltimore A-30 bomber

Photos

  • Martin 187 Baltimore bomber
  • Martin 187 Baltimore bomber
  • Martin Baltimore Mk I bomber
  • Martin Baltimore Mk I bomber
  • Martin Baltimore Mk II bomber
  • Martin Baltimore Mk III bomber
  • Martin Baltimore Mk IV bomber
  • Martin Baltimore Mk IV bomber

Design

In 1937 the United States Army Air Corps (USAAC) put out a specification for a light bomber.4 The Martin 187 Baltimore was designated the A-30 but was never used by the American military.4

The design for the Martin 187 Baltimore was based on the Martin 167 Maryland.1,3,5,6 The wings on both planes were nearly identical.1

The British wanted to have a plane that the crew members could communicated between each other, which the Martin 167 Maryland lacked.2 The British ordered the Baltimores in May 1940.3

Crew Cabin

The cabin in the Baltimore was very cramped and if the pilot became injured it was near impossible for another crew member to take over the controls.1

Engines

The Baltimore originally had the Wright R-2600-19 engines before using the Wright R-2600-29 radials.1

Tail

The rear fuselage was nearly like a boom holding the tail unit.1 The front fuselage for the Baltimore was deeper than the Maryland's.1

Prototypes

The Baltimore was first flown on June 14, 1941.2,3

Production

Deliveries of the Baltimore Mk I began in October 1941 and ended in May 1944.3

The cost of the Baltimore was $120,000.1

  • Martin Baltimore Mk I: 502,3,6
  • Martin Baltimore Mk II: 1002,3
  • Martin Baltimore Mk III: 2502,3
  • Martin Baltimore Mk IIIA: 2812,3
  • Martin Baltimore Mk IV: 2942,3
  • Martin Baltimore Mk V: 6002,3
  • Total: 1,5751,3,4,6
    • Manufacturer: Glenn L. Martin Company4
    • Production: ? - May 19444,6

Variants

  • Martin 187: Martin's designation.5
  • Martin Baltimore Mk I: Had Wright R-2600-A5B engines (1,600 HP).2 There was a single machine gun in the dorsal position.2,4,6
  • Martin Baltimore Mk II: Had twin guns in dorsal position.2,4
  • Martin Baltimore Mk III: To improve protection from attacks from above a Boulton-Paul turret was installed.1,2,3,4 It contained four Browning 7.7 mm MGs.1 Had Wright R-2600-19 engines.2
  • Martin Baltimore Mk IIIA: Had Martin turret.3
  • Martin Baltimore Mk IV: Had a Martin dorsal turret.2,3
  • Martin Baltimore Mk V: Had Wright R-2600-29 engines (1,700 HP).2 Had a Martin turret.4

Usage

The Baltimores were used by Australia, Britain, France, Greece, Italy, South Africa, and Turkey.3

United Kingdom

400 Baltimores were ordered by the United Kingdom.1

The first 50 were shipped to Great Britain in October 1941.6

The first 150 Baltimores were shipped with a single machine gun in the dorsal position.6

20 were lost at sea while on the way by ship to England.1

A total of 1,575 Baltimores were delivered to the Royal Air Force (RAF) and all of them fought in the Mediterranean theater.2,3 There were seven RAF squadrons and two South African Air Force squadrons equipped with Baltimores.2

North Africa

The No 223 Squadron, at Shandur, Egypt, was the first to receive the Baltimores for operational use in January 1942.6

All of the initial order of 400 Baltimores were shipped to Egypt to help fight against Rommel and his 1942 offensive.1 They were used quite effectively while being escorted by Curtis Kittyhawks at El Alamein.1

Italian Co-Belligerents

Some (40 Baltimore Mk IVs and Baltimore Mk Vs4) Baltimores were given to the Italian Co-Belligerent Forces and equipped the Stormo Baltimore that were used in the Balkans in 1945.2,3

Turkey

Turkey received some Baltimores towards the end of World War II as a part of a Lend-Lease agreement.1

After World War II

After the war the United States Navy used the Baltimores to test experimental airfoils.1

The Royal Air Force used Baltimores in Kenya for aerial mapping and locust control until 1948.1

Specifications

  Baltimore
Type Light bomber3
Crew 43
Engine (Type) 2: Wright5
Cylinders Radial5
HP 1,600 each5
Dimensions  
Span 61' 4"3,5
18.69 m3
Length 48' 6"3,5
14.78 m3
Height 17' 9"3,5
5.41 m3
Performance  
Speed 320 mph5
  Baltimore Mk I
Type Bomber4
Crew 44
Engine (Type) 2: Wright GR-2600-A5B Cyclone3,4
Cylinders Radial 143,4
Cooling Air4
HP 1,600 each3, 1,660 each4
Propeller blades 3 each3
Dimensions  
Span 61' 4"4
Length 48' 6"4
Height 17' 9"4
Weight  
Loaded 23,000 lb4
Performance  
Speed @ 11,000' /
3,353 m
302 mph4
Service ceiling 24,000'4
Range 950 miles4
Armament 8: MG4
Wings 4: 0.303" MG3
Dorsal turret 2 or 4: 0.303" MG3
Ventral position 2: 0.303" MG3
Rear fixed 4: 0.303" MG3
Bombs 2,000 lb4
Bomb-bay 2,000 lb3
907 kg3
  Baltimore Mk II
Engine (Type) 2: Wright GR-2600-A5B3
Cylinders Radial 143
HP 1,600 each3
Propeller blades 3 each3
Armament  
Wings 4: 0.303" MG3
Dorsal turret 2 or 4: 0.303" MG3
Ventral position 2: 0.303" MG3
Rear fixed 4: 0.303" MG3
Bomb-bay 2,000 lb3
907 kg3
  Baltimore Mk III, Baltimore Mk III
Type Light Bomber2, Light / Medium Bomber6
Crew 42,6
Engine (Type) 2: Wright GR-2600-A582
2: Wright GR-2600-193,6
Cylinders Radial2, Radial 196
HP 1,660 each2,3,6
Propeller blades 3 each3
Dimensions  
Span 61' 4"2,6
18.69 m2,6
Length 48' 5.75"2,6
14.77 m2,6
Height 17' 9"2,6
5.41 m2,6
Wing area 538.5 ft2 2,6
50.93 m2 2,6
Weight  
Empty 15,200 lb2,3,6
6,895 kg2,3,6
Loaded 23,000 lb2,3,6
10,433 kg2,3,6
Performance  
Speed at 11,000' / 3,353 m 302 mph3
486 kph3
Speed at 11,000' / 3,355 m 302 mph2,6
486 kph2,6
Climb to 15,000' / 4,570 m 12 minutes2,3,6
Service ceiling 24,000'2,3,6
7,315 m2,3,6
Range 950 miles2,3
1,529 km3, 1,530 km2
Armament  
Wings 4: 0.303" MG3, 0.303" / 7.7 mm Browning MG6
4: 7.7 mm MG2
Dorsal turret 2 or 4: 0.303" MG3, 0.303" / 7.7 mm Browning MG6
2 or 4: 7.7 mm MGs2
Ventral position 2: 0.303" MG3, 0.303" / 7.7 mm Browning MG6
2: 7.7 mm MG2
Rear fixed 4: 0.303" MG3
Bomb-bay 2,000 lb2,3,6
907 kg2,3,6
  Baltimore Mk IIIA
Engine (Type) 2: Wright GR-2600-193
HP 1,660 each3
Propeller blades 3 each3
Armament  
Wings 4: 0.303" MG3
Dorsal turret 2: 0.303" MG3
Ventral position 2: 0.303" MG3
Rear fixed 4: 0.303" MG3
Bomb-bay 2,000 lb3
907 kg3
  Baltimore Mk IV, Baltimore Mk IV, Baltimore Mk IVA
Type Bomber4, Light bomber1
Crew 34, 41
Engine (Type) 2: Wright R-2600-19 Cyclone 14 piston1
2: Wright R-2600-193
2: Wright R-2600-29 Cyclone4
Cylinders Radial1, Radial 144
Cooling Air4
HP 1,660 each1,3, 1,700 each4
Propeller blades 3 each1,3
Dimensions  
Span 61' 4"1,4
18.69 m1
Length 48' 6"1,4
14.78 m1
Height 17' 9"1,4
5.41 m1
Wing area 538 ft2 1
50.03 m2 1
Weight  
Empty 15,429 lb1
7,013 kg1
Loaded 22,550 lb1, 22,600 lb4
10,251 kg1
Performance  
Speed @ 11,500' /
3,505 m
304 mph1
491 kph1
Speed @ 14,760' 320 mph4
Service ceiling 23,300'1, 24,600'4
7,100 m1
Range 950 miles4, 1,080 miles1
1,741 km1
Armament 7: MG4
Wings 4: 0.303" MG3
4: 12.7 mm MG1
Dorsal turret 2: 0.303" MG3
Ventral position 2: 0.303" MG3
2 or 4: 12.7 mm MG1
Rear fixed 4: 0.303" MG3
Rear turret 4: 7.62 mm MG1
Bombs 2,000 lb4
Bomb-bay 2,000 lb1,3
907 kg1,3
  Baltimore Mk V
Engine (Type) 2: Wright GR-26006
2: Wright GR-2600-293
HP 1,700 each3
Propeller blades 3 each3
Armament  
Wings 4: 0.303" MG3
Dorsal turret 2: 0.303" MG3
Ventral position 2: 0.303" MG3
Rear fixed 4: 0.303" MG3
Bomb-bay 2,000 lb3
907 kg3

Sources:

  1. Aircraft of WWII, General Editor: Jim Winchester, 2004
  2. Fighting Aircraft of World War II, Editor: Karen Leverington, 1995
  3. Aircraft of WWII, Stewart Wilson, 1998
  4. World War II Airplanes Volume 2, Enzo Angelucci, Paolo Matricardi, 1976
  5. Aeronautics Aircraft Spotters' Handbook, Ensign L. C. Guthman, 1943
  6. The Encyclopedia of Weapons of World War II, Chris Bishop, 1998
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