Martin Baltimore

Last updated
Baltimore
Martin A-30A.jpg
Royal Air Force Martin Baltimore GR.IV/V
Role Light bomber
Reconnaissance
National originUnited States
Manufacturer Glenn L. Martin Company
First flight14 June 1941
Introduction1941
Retired1949
Primary users Royal Air Force
Royal Canadian Air Force
Royal Australian Air Force
South African Air Force
Number built1,575
Developed from Martin Maryland

The Martin 187 Baltimore was a twin-engined light attack bomber built by the Glenn L. Martin Company in the United States as the A-30. The model was originally ordered by the French in May 1940 as a follow-up to the earlier Martin Maryland, then in service in France. With the fall of France, the production series was diverted to Great Britain and after mid-1941, supplied by the U.S. as Lend Lease equipment.

Contents

Development of the Baltimore was hindered by a series of problems, although the type eventually became a versatile combat aircraft. Produced in large numbers, the Baltimore was not used operationally by United States armed forces but eventually served with the British, Canadian, Australian, South African, Hellenic and the Italian air forces. [1] It was subsequently used almost exclusively in the Mediterranean and Middle East theatre of World War II.

Design and development

Initially designated the A-23 (derived from the A-22 Martin 167 Maryland design), the Model 187 (company designation) had a deeper fuselage and more powerful engines. The Model 187 met the needs for a light-to-medium bomber, originally ordered by the Anglo-French Purchasing Commission as a joint project in May 1940. The French Air Force sought to replace the earlier Maryland; 400 aircraft being ordered. With the Fall of France, the Royal Air Force (RAF) took over the order and gave it the service name Baltimore. To enable the aircraft to be supplied to the British under the Lend-Lease Act the United States Army Air Forces designation A-30 was allocated. [lower-alpha 1] With the passing of the Lend Lease Act two further batches of 575 and then 600 were provided to the RAF.

Operational history

Martin A-30 in USAAF colors prior to delivery Martin A-30.jpg
Martin A-30 in USAAF colors prior to delivery

The first British aircraft were delivered in late 1941 to equip Operational Training Units. The RAF only used the Baltimores operationally in the Mediterranean theater and North Africa. [2] Many users were impressed by the step up that the Baltimore represented from older aircraft like the Bristol Blenheim. Users of the Baltimore and Martin pilot Benjamin R. Wallace, praised the aircraft for its heavy armament, structural strength, manoeuvrability, bombing accuracy and relatively high performance but crews complained of cramped conditions similar to those in the earlier Maryland bomber. The narrow fuselage made it nearly impossible for crew members to change positions during flight if wounded (the aircraft's interior structure separated the pilot and observer from the wireless operator and rear gunner, a characteristic shared with several light and medium bomber designs of that era e.g. Handley Page Hampden, Douglas Boston and Blenheim). Crews also complained about the difficulties in handling the aircraft on the ground. On takeoff, the pilot had to co-ordinate the throttles perfectly to avoid a nose-over or worse. [3]

Thrown into action to stop Rommel's advance, the Baltimore suffered massive losses when it was used as a low-level attack aircraft, especially in the chaos of the desert war where most missions went unescorted. [1] Operating at medium altitude with fighter escorts, the Baltimore had a very low loss rate, with the majority of losses coming from operational accidents. Undertaking a variety of missions in the Middle East, Mediterranean and European theaters, the Baltimore's roles included reconnaissance, target-towing, maritime patrol, night intruder and even served as highly uncomfortable fast transports. The Baltimore saw limited Fleet Air Arm service with aircraft transferred from the RAF in the Mediterranean to equip a squadron in 1944. Used in the anti-submarine role during the war, the Baltimore achieved moderate success, sinking up to eight U-boats.

The RAF also transferred aircraft to other Allies in the Mediterranean area. The Baltimore was used intensively in the Italian campaign to clear the road to Rome for advancing Allied forces after the capitulation of Italy in 1943. [3] After the Armistice between Italy and Allied armed forces an Italian-manned squadron, the 28th Bomber Wing, was equipped with ex-RAF Baltimores, becoming the co-belligerent Stormo Baltimore. [4] The Italians suffered considerable attrition during their training phase on the Baltimore. The majority of accidents were during takeoffs and landings due to the aircraft's fairly high wing loading, high approach speed and a directional stability problems during takeoffs. The Italians operated the Baltimore for about six months. Many of those operations were in Yugoslavia and Greece, providing air support for partisan forces or dropping supplies.

Most Baltimores were scrapped soon after the war, although one RAF squadron continued to use the type in Kenya where the aircraft were used in aerial mapping and locust control until 1948. In post-war service, the Baltimore took part in United States Navy instrument and control surface tests in the effort to break the sound barrier. With its powerful engines and light, yet robust construction, the aircraft was able to be dived at high speed, reaching Mach .74 in tests. [1] All Baltimores were withdrawn from service by the end of 1949, the last one being retired on 23 December 1949.

Variants

Martin Baltimore GR.I A30-9.jpg
Martin Baltimore GR.I
Baltimore B. I
Fitted with 1,600 hp (1,193 kW) Wright GR-2600-A5B radial piston engines, armed with 10 0.303 in (7.7 mm) machine guns, eight fixed Brownings and two flexible Vickers K machine guns; all marks had two fixed 0.303 in (7.7 mm) Brownings in the leading-edge of each wing and four similar fixed guns, two on each side of the lower fuselage aft firing backwards, plus two flexible Vickers K guns in dorsal and ventral. 50 aircraft built.
Baltimore B. II
Defensive armament increased to 12 0.303 in (7.7 mm) machine guns including twin 0.303 in (7.7 mm) Vickers K machine guns in both the dorsal and ventral positions. Otherwise the same as the Mk I. 100 aircraft built.
Baltimore B. III
The Baltimore GR.IIIA variant supplied to the British under the Lend-Lease program. This variant was equipped with a Martin dorsal turret housing twin .50-caliber M2 machine guns. Martin A-30 USAAF BaltimoreIIIA.jpg
The Baltimore GR.IIIA variant supplied to the British under the Lend-Lease program. This variant was equipped with a Martin dorsal turret housing twin .50-caliber M2 machine guns.
Modified Mk II design with defensive armament increased to 14 0.303 in (7.7 mm) guns by the replacement in the UK of the original dorsal turret with a hydraulically powered turret supplied by Boulton Paul fitted with four Browning machine guns. 250 aircraft built.
Baltimore B. IIIa (A-30-MA)
Ordered by USAAF and supplied under Lend-lease to the RAF, two 0.50 in (12.7 mm) machine guns in a Martin-built electrically powered dorsal turret. 281 aircraft built.
Baltimore B. IV (A-30A-MA)
USAAF order, lend-lease to RAF. Four 0.303 in (7.7 mm) Brownings machine guns in the wings. 294 aircraft built.
Baltimore B. V (A-30A-MA)
USAAF order, upgraded with two 1,700 hp (1,268 kW) Wright R-2600-29 radial piston engines, and with 0.50 in (12.7 mm) machine guns in the wings. 600 aircraft built.
Baltimore GR. VI (A-30C-MA)
Two prototypes built for maritime reconnaissance. They included a lengthened fuselage, accommodations for extra fuel tanks and a torpedo, and a Radome in nose. The whole program was cancelled in April 1944. [1]


All of the series were built for the RAF. A number were lost on delivery across the Atlantic Ocean when two ships carrying Baltimores were sunk.

Operators

Flag of Australia (converted).svg  Australia
Canadian Red Ensign (1921-1957).svg  Canada
Flag of Free France (1940-1944).svg  Free France
Flag of Greece (1822-1978).svg  Greece
Flag of Italy (1861-1946) crowned.svg  Kingdom of Italy
Flag of Italy.svg  Italy
Flag of South Africa (1928-1982).svg  South Africa
Flag of Turkey.svg  Turkey
Flag of the United Kingdom.svg  United Kingdom

Surviving aircraft

Although the Baltimore was produced in greater numbers than any other Martin design except the B-26 Marauder, with 1575 produced, no aircraft have survived intact, although the wreckage of several are known to exist.[ citation needed ]

Specifications (Baltimore GR.V)

Martin 187 Baltimore 3-view drawing Martin 187 Baltimore 3-view.svg
Martin 187 Baltimore 3-view drawing

Data fromJane's Fighting Aircraft of World War II. [9]

General characteristics

Performance

Armament

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

Related Research Articles

<span class="mw-page-title-main">North American B-25 Mitchell</span> American WWII medium bomber

The North American B-25 Mitchell is an American medium bomber that was introduced in 1941 and named in honor of Brigadier General William "Billy" Mitchell, a pioneer of U.S. military aviation. Used by many Allied air forces, the B-25 served in every theater of World War II, and after the war ended, many remained in service, operating across four decades. Produced in numerous variants, nearly 10,000 B-25s were built, It was the most-produced American medium bomber and the third most-produced American bomber overall. These included several limited models such as the F-10 reconnaissance aircraft, the AT-24 crew trainers, and the United States Marine Corps' PBJ-1 patrol bomber.

<span class="mw-page-title-main">Curtiss P-40 Warhawk</span> American WWII fighter

The Curtiss P-40 Warhawk is an American single-engined, single-seat, all-metal fighter-bomber that first flew in 1938. The P-40 design was a modification of the previous Curtiss P-36 Hawk which reduced development time and enabled a rapid entry into production and operational service. The Warhawk was used by most Allied powers during World War II, and remained in frontline service until the end of the war. It was the third most-produced American fighter of World War II, after the North American P-51 Mustang and Republic P-47 Thunderbolt; by November 1944, when production of the P-40 ceased, 13,738 had been built, all at Curtiss-Wright Corporation's main production facilities in Buffalo, New York.

<span class="mw-page-title-main">Bristol Blenheim</span> British light bomber in World War II

The Bristol Blenheim is a British light bomber designed and built by the Bristol Aeroplane Company, which was used extensively in the first two years of the Second World War, with examples still being used as trainers until the end of the war. Development began with the Type 142, a civil airliner, after a challenge from the newspaper proprietor Lord Rothermere to produce the fastest commercial aircraft in Europe. The Type 142 first flew in April 1935, and the Air Ministry, ordered a modified design as the Type 142M for the Royal Air Force (RAF) as a bomber.

<span class="mw-page-title-main">Consolidated B-24 Liberator</span> 1939 bomber aircraft family by Consolidated Aircraft

The Consolidated B-24 Liberator is an American heavy bomber, designed by Consolidated Aircraft of San Diego, California. It was known within the company as the Model 32, and some initial production aircraft were laid down as export models designated as various LB-30s, in the Land Bomber design category.

<span class="mw-page-title-main">Desert Air Force</span> Allied tactical air unit during World War II

The Desert Air Force (DAF), also known chronologically as Air Headquarters Western Desert, Air Headquarters Libya, the Western Desert Air Force, and the First Tactical Air Force (1TAF), was an Allied tactical air force created from No. 204 Group RAF under RAF Middle East Command in North Africa in 1941 to provide close air support to the British Eighth Army against Axis forces. Throughout the Second World War, the DAF was made up of squadrons from the Royal Air Force (RAF), the South African Air Force (SAAF), the Royal Australian Air Force (RAAF), the United States Army Air Forces (USAAF) and other Allied air forces.

<span class="mw-page-title-main">Martin B-26 Marauder</span> US medium bomber with 2 piston engines, 1940

The Martin B-26 Marauder is an American twin-engined medium bomber that saw extensive service during World War II. The B-26 was built at two locations: Baltimore, Maryland, and Omaha, Nebraska, by the Glenn L. Martin Company.

<span class="mw-page-title-main">Fairey Albacore</span> 1938 torpedo bomber by Fairey Aviation

The Fairey Albacore is a single-engine biplane torpedo bomber designed and produced by the British aircraft manufacturer Fairey Aviation. It was primarily operated by the Royal Navy Fleet Air Arm (FAA) during the Second World War.

<span class="mw-page-title-main">Armstrong Whitworth Whitley</span> 1936 bomber aircraft by Armstrong Whitworth

The Armstrong Whitworth A.W.38 Whitley was a British medium bomber aircraft of the 1930s. It was one of three twin-engined, front line medium bomber types that were in service with the Royal Air Force (RAF) at the outbreak of the Second World War. Alongside the Vickers Wellington and the Handley Page Hampden, the Whitley was developed during the mid-1930s according to Air Ministry Specification B.3/34, which it was subsequently selected to meet. In 1937, the Whitley formally entered into RAF squadron service; it was the first of the three medium bombers to be introduced.

<span class="mw-page-title-main">Handley Page Halifax</span> Royal Air Force four-engine heavy bomber of WWII

The Handley Page Halifax is a British Royal Air Force (RAF) four-engined heavy bomber of the Second World War. It was developed by Handley Page to the same specification as the contemporary twin-engine Avro Manchester.

<span class="mw-page-title-main">Douglas A-20 Havoc</span> American medium bomber and attack aircraft of World War II

The Douglas A-20 Havoc is an American medium bomber, attack aircraft, night intruder, night fighter, and reconnaissance aircraft of World War II.

<span class="mw-page-title-main">Lockheed Hudson</span> Family of transport and patrol bomber aircraft

The Lockheed Hudson is a light bomber and coastal reconnaissance aircraft built by the American Lockheed Aircraft Corporation. It was initially put into service by the Royal Air Force shortly before the outbreak of the Second World War and primarily operated by it thereafter. The Hudson was a military conversion of the Model 14 Super Electra airliner, and was the first significant aircraft construction contract for Lockheed — the initial RAF order for 200 Hudsons far surpassed any previous order the company had received.

<span class="mw-page-title-main">Lockheed Ventura</span> Family of bomber aircraft

The Lockheed Ventura is a twin-engine medium bomber and patrol bomber of World War II.

<span class="mw-page-title-main">Hawker Hart</span> 1928 bomber airplane family by Hawker

The Hawker Hart is a British two-seater biplane light bomber aircraft that saw service with the Royal Air Force (RAF). It was designed during the 1920s by Sydney Camm and manufactured by Hawker Aircraft. The Hart was a prominent British aircraft in the inter-war period, but was obsolete and already side-lined for newer monoplane aircraft designs by the start of the Second World War, playing only minor roles in the conflict before being retired.

<span class="mw-page-title-main">North American A-36</span> 1942 attack aircraft model by North American Aviation

The North American A-36 was the ground-attack/dive bomber version of the North American P-51 Mustang, from which it could be distinguished by the presence of rectangular, slatted dive brakes above and below the wings. A total of 500 A-36 dive bombers served in the Mediterranean and Southeast Asia theaters during World War II before being withdrawn from operational use in 1944.

<span class="mw-page-title-main">Martin Maryland</span> 1939 bomber aircraft family by the Glenn L. Martin Company

The Martin Model 167 Maryland was an American light bomber that first flew in 1939. It saw action in World War II with France and the United Kingdom.

<span class="mw-page-title-main">Vultee A-31 Vengeance</span> 1941 attack aircraft family by Vultee

The Vultee A-31 Vengeance is an American dive bomber of World War II, built by Vultee Aircraft. A modified version was designated A-35. The Vengeance was not used operationally by the United States, but was operated as a front-line aircraft by the British Royal Air Force, the Royal Australian Air Force, and the Indian Air Force in Southeast Asia and the Southwest Pacific. The A-31 remained in service with U.S. units until 1945, primarily in a target-tug role.

<span class="mw-page-title-main">No. 500 Squadron RAF</span> Royal Air Force flying squadron

No. 500 Squadron AAF was a Royal Air Force flying squadron. It was initially formed in 1931 as a Special Reserve squadron and in 1936 became part of the Auxiliary Air Force, at this time based at Manston and Detling.

<span class="mw-page-title-main">No. 223 Squadron RAF</span> Military unit

No. 223 Squadron RAF was a squadron of the Royal Air Force. Originally formed as part of the Royal Naval Air Service (RNAS), the Squadron flew in both World Wars.

No. 329 Squadron RAF was a Royal Air Force fighter squadron founded upon the personnel and traditions of the French 1/2 fighter squadron Storks, having markings "5A" 1944-1945.

No. 185 Squadron RAF was a Royal Air Force Squadron formed in World War I and reformed as a bomber and fighter unit in World War II. It then reformed in Malta in the post war period as a jet fighter squadron.

References

Notes
  1. under the provisions of Lend-Lease, aircraft supplied to Allied nations had first to be purchased by the USAAC and be taken onto that service's inventory. Thus, aircraft not requested by the USAAC had still to be allocated a USAAC designation, in this case 'A-30'.
  1. 1 2 3 4 Martin Model 187, marylandaviationmuseum.org, archived from the original on 2007-09-20, retrieved 17 June 2010
  2. Rickard, J. "Martin Baltimore – Development and Combat Record." historyofwar.org, 2 September 2008. Retrieved: 17 June 2010.
  3. 1 2 Angelucci and Matricardi 1978, p. 63.
  4. Caliaro 2000, p. 25.
  5. RCAF Baltimore, rcaf.com, retrieved 2 July 2012
  6. Martin A.30 Baltimore, archived from the original on 2014-12-08, retrieved 2014-12-07
  7. "Italian Air Force". aeroflight. Retrieved 30 May 2019.
  8. Sturtivant and Ballance 1994, pp. 50–51, 361
  9. Bridgeman 1946, p. 246.
Bibliography