Martin Baltimore

The Martin 187 Baltimore was a two-engined light attack bomber built by the Glenn L. Martin Company in the United States, 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. Baltimore development was hindered by a series of problems, although the type eventually became a highly versatile combat aircraft. Produced in large numbers, the Baltimore was not used in combat by the United States forces, but eventually served with the British, Canadian, Australian, South African, Hellenic and the Italian air forces.


Martin Baltimore
Class Aircraft
Type Bomber
Manufacturer Glenn L. Martin Company
Origin United Kingdom - UK (Great Britain)
Country Name Origin Year
United Kingdom - UK (Great Britain) 1941
Country Name Operational Year Retirement Year
Australia View
Canada View
France View
Greece View
Italy View
South Africa View
Turkey (Ottoman Empire) View
United Kingdom - UK (Great Britain) View
ManufacturerName Production From Production To Quantity
Glenn L. Martin Company 1575 View

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.

With the passing of the Lend Lease Act two further batches of 575 and then 600 were provided to the RAF.

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.

Many users were impressed by the step up that the Baltimore represented from older aircraft like the Bristol Blenheim. The users of the Baltimore, and Martin pilot Benjamin R. Wallace, praised the aircraft for its heavy armament, structural strength, maneuverability, bombing accuracy, and relatively high performance, but crews complained of cramped conditions similar to those in the earlier Maryland bomber. Due to the narrow fuselage it was nearly impossible for crew members to change positions during flight if wounded (the structure of the interior meant that the pilot and observer were separated from the wireless operator and rear gunner). This was common for most light bombers of the era like the 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.

Thrown into action to stop Rommel's advance, the Baltimore suffered massive losses when it was utilized as a low-level attack aircraft, especially in the chaos of the desert war where most missions went unescorted. However, 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. After the capitulation of Italy in 1943, the type was used intensively in the Italian campaign to clear the road to Rome for advancing Allied forces. After the armistice, an Italian-manned squadron, the 28th Bomber Wing, was equipped with ex-RAF Baltimores, becoming the co-belligerent Stormo Baltimore. 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 only operated the Baltimore for roughly 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. All Baltimores were withdrawn from service by the end of 1949, the last one being retired on 23 December 1949.

Role Light bomber
Reconnaissance
Manufacturer Glenn L. Martin Company
First flight 14 June 1941
Introduction 1941
Retired 1949
Status retired
Primary users Royal Air Force
Royal Canadian Air Force
Royal Australian Air Force
South African Air Force
Number built 1575
Unit cost $120,000
Developed from Martin Maryland


General characteristics

  • Crew: four: pilot, navigator/bombardier, radio operator, gunner
  • Length: 48 ft 6 in (14.8 m)
  • Wingspan: 61 ft 4 in (18.7 m)
  • Height: 14 ft 2 in (4.32 m)
  • Wing area: 538.5 ft² (50 m²)
  • Empty weight: 15,991 lb (7,253 kg)
  • Loaded weight: 23,185 lb (10,900 kg)
  • Powerplant: 2 × Wright GR-2600-A5B geared radial engines, 1,700 hp (1,268 kW) each

Performance

  • Maximum speed: 305 mph (295 kn, 488 km/h) at 11,600 ft (3,540 m)
  • Cruise speed: 224 mph (360 km/h)
  • Range: 980 miles (1,577 km)
  • Wing loading: 46.2 lb/ft² (226 kg/m²)
  • Power/mass: 0.14 hp/lb (220 W/kg)

Armament

  • Guns: 4 × wing mounted 0.303 in (7.7 mm) M1919 Browning machine guns. 2–4 × 0.303 in (7.7 mm) machine guns in dorsal turret, 2 × 0.303 in (7.7 mm) machine guns in ventral position and provisions for up to 4 × fixed rear firing 0.303 in (7.7 mm) machine guns.
  • Bombs: 2,000 lb (910 kg) carried internally

End notes