Martin Baltimore

Initially called the A-23 (derived from the A-22 Martin 167 Maryland design), the Model 187 (company name) 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 name 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. ==Operational history==

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. 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 including 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. First used in action to stop Rommel's advance, the Baltimore suffered massive losses when it was used as a low-level attack aircraft, in large part due to being unescorted. 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 dive 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. In 2025, the wreck of a Baltimore of 454 Squadron (Royal Australian Air Force) was discovered off the coast of the Mediterranean island Antikythera. On 3 December 1943, the aircraft had been on a reconnaissance mission from its base in Bengazi, Libya, when it was shot down by two Messerschmitt fighters. ==Variants==

;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 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. 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==

; • Royal Australian Air Force • No. 454 Squadron RAAF (Baltimore III, IV, V) (North Africa, Pescara Italy: February 1943 – 14 August 1945) • No. 459 Squadron RAAF (Baltimore IV – V) (Mediterranean: July 1944 – March 1945) ; • Royal Canadian Air Force • Baltimore B. III FA187 • A single Baltimore was loaned to the RCAF by RAF Ferry Command for "special" project duties (1942) ; • Free French Air Force • GB 1/17 ; • Royal Hellenic Air Force • RHAF 13 Light Bomber Squadron (Baltimore II, IV) (Gambut North Africa, Biferno Pescara Italy, Balkans: 1943–1945) ; • Italian Co-Belligerent Air Force – 49 aircraft • 28° Gruppo (Stormo Baltimore) (1945 – February 1948) • 132° Gruppo – 254 Wing RAF ; • Italian Air Force operated 49 aircraft until 1947 ; • South African Air Force • No. 15 Squadron SAAF (Baltimore IIIa – V) (Mediterranean: 1943–1945) • No. 21 Squadron SAAF. (Baltimore III – IV) (North Africa, Italy: 1942–1944) • No. 60 Squadron SAAF (Baltimore II – III) (North Africa: 1942–1943) ; • Turkish Air Force • 1st Bomber Regiment ; • Royal Air Force • 1st Middle East Training Squadron • No. 13 Squadron RAF (Baltimore IV – V) (Italy: 1944) • No. 52 Squadron RAF (Baltimore IIIa – V) (Tunisia, Italy: February 1942 – February 1943) • No. 55 Squadron RAF (Baltimore I – V) (Libya, Tunisia, Italy: 1942–1944) • No. 69 Squadron RAF (Baltimore I – IV) (Mediterranean: 1942–1944) • No. 162 Squadron RAF (Baltimore III) (Libya: 1943–1944) • No. 203 Squadron RAF (Baltimore I, II, IIIa, V) (North Africa: 1942–1943) • No. 223 Squadron RAF (Baltimore I – V) (North Africa, Italy: April 1941 – 12 August 1944) • No. 249 Squadron RAF (Baltimore IV – V) (South-East Europe: October 1945 – April 1946) • No. 500 Squadron RAF (Baltimore IV – V) (Italy: 1944–1945) • No. 680 Squadron RAF (Baltimore III, V) (Italy: 1944) • Fleet Air Arm • 728 Naval Air Squadron (Baltimore GR IV – V) (Malta: September 1944 – October 1946) ==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. ==Specifications (Baltimore GR.V)==