The Martin 187 Baltimore was a twin-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.
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. (With the passing of the Lend Lease Act two further batches of 575 and then 600 were provided to the RAF.)
Operational History
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.
Variants
Baltimore B. I
Fitted with 1,600 hp (1,193 kW) Wright GR-2600-A5B radial piston engines, armed with ten 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 guns in dorsal and ventral. 50 aircraft built.
Baltimore B. II
As with the Mk I; defensive armament was 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. 100 aircraft built.
Baltimore B. III
Modified Mk II design defensive armament was increased to 14 0.303 in (7.7 mm) guns and improved with a hydraulically powered dorsal turret supplied by Boulton Paul in the UK with 4 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, Wings fitted with 0.50 in (12.7 mm) machine guns. 600 aircraft built.
Baltimore GR. VI (A-30C-MA)
Two prototypes were 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. (900 cancelled)
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
Australia
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)
Canada
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 France
Free French Air Force
GB 1/17
Greece
Royal Hellenic Air Force
RHAF 13 Light Bomber Squadron (Baltimore II, IV) (Gambut North Africa, Biferno Pescara Italy, Balkans: 1943–1945)
Kingdom of Italy
Italian Co-Belligerent Air Force - 49 aircraft
28° Gruppo (Stormo Baltimore) (1945 - February 1948)
132° Gruppo - 254 Wing RAF
Italy
Italian Air Force operated the aircraft until 1947
South Africa
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)
Turkey
Turkish Air Force
1st Bomber Regiment
United Kingdom
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 - November 1946)
Survivors
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.
Data (Baltimore GR.V)
Role:
Light bomber
Reconnaissance
Manufacturer: Glenn L. Martin Company
First flight: 14 June 1941
Introduction: 1941
Retired: 1949
Primary users:
Royal Air Force
Royal Canadian Air Force
Royal Australian Air Force
South African Air Force
Number built: 1,575
Martin Baltimore Mk I: 50
Martin Baltimore Mk II: 100
Martin Baltimore Mk III: 250
Martin Baltimore Mk IIIA: 281
Martin Baltimore Mk IV: 294
Martin Baltimore Mk V: 600
Unit cost: $120,000
Developed from: Martin Maryland
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
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)
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
| “Baltimore crew talking after raid.” Depicts three unidentified Baltimore crew members talking after a raid, Italy. Painting by Alan Moore, 1944. |
| Martin (A-30) Baltimore I. |
| A Royal Air Force Martin Baltimore GR.IV/V bomber. Most aircraft were delivered to Commonwealth countries, a few were kept in the U.S. under the USAAF designation A-30. |
| Martin Baltimore. |
| Baltimore Mark I, AG688, at the Burtonwood Repair Depot, Lancashire, before despatch to the Aeroplane and Armament Experimental Establishment at Boscombe Down, Wiltshire, for flight tests. |
| Martin Baltimore. |
| A line of Martin Baltimore Mark IVs of No. 223 Squadron RAF Detachment at Luqa, Malta, being refueled and loaded with bombs for a raid on enemy positions around Catania, Sicily. |
| Martin Baltimore Mark IVs of No. 223 Squadron RAF based at Celone, Italy, flying in loose box formation over Italian farmland while on their way to bomb the railway station and junction at Sulmona. |
| A Martin Baltimore Mark IV of No. 223 Squadron RAF, flying from Celone, Italy, releasing 500-lb MC bombs over the target during a raid on the railway station and junction at Sulmona. |
| A Martin Baltimore Mark IV of No. 223 Squadron RAF based at Celone, Italy, flying over San Severo while heading north-west to bomb the railway junction at Sulmona. |
| Two Martin Baltimore Mark IVs of No. 223 Squadron RAF based at Celone, Italy, in flight while en route to bomb a chemical factory in the Popoli area. |
| A Martin Baltimore Mark IV of No. 223 Squadron RAF sends up sprays of water while landing at rain-soaked Celone, Italy, along a runway laid with pierced steel planking (PSP). |
| A formation of Martin Baltimores of No. 232 Wing RAF flying to attack enemy positions during the Battle of El Alamein, seen through the lower gun hatch of another aircraft. |
| Wrecked bomber of type Martin Baltimore type IIIA of the British Royal Air Force on 12th December 1942 near Accra, Gold Coast. |
| Crash of a Martin Baltimore type IIIA bomber near Accra, Gold Coast. |
| Ground crews servicing, or stripping, a Martin Baltimore Mark IIIA, FA353 ‘X,’ of No. 69 Squadron RAF in a revetment built of limestone blocks at Luqa, Malta. |
| A Martin Baltimore of No. 69 Squadron RAF is serviced in a revetment built with limestone blocks at Luqa, Malta. In the background can be seen St Andrew’s parish church in Luqa village. |
| A Martin Baltimore of the Tactical Bomber Force of the North West African Air Forces, flies over its target by a road in Sicily, while bombing retreating German forces heading for Messina. |
| Operation PUGILIST. Martin Baltimore Mark IIIAs of No. 232 Wing RAF taxi to the take-off point at Ben Gardane North, Tunisia, to bomb the Mareth Line. |
| Operation PUGILIST. Martin Baltimore Mark IIIAs of No. 232 Wing RAF flying in loose formation off the coast of Tunisia, en route to bomb the Mareth Line. |
| A Martin Baltimore Mark IIIA of No. 55 Squadron RAF (right), takes off from Ben Gardane North, Tunisia, for an attack on Mareth village, as other aircraft of the Squadron taxi to the take off point |
| Martin Baltimores of No. 232 Wing RAF of the Tactical Bomber Force, head northwards along the Adriatic coast of Italy to bomb enemy gun positions near Lanciano in the Sangro River battle area. |
| Martin Baltimores of the Desert Air Force fly over the Adriatic coast after bombing bridges at Giulianova, Abruzzo, Italy. |
| Six Martin Baltimores of the Desert Air Force, flying in formation on their way to attack German gun positions in the Liri Valley. The River Liri can be seen at left. |
| Engine mechanics at work on a Martin Baltimore Mark II, AG747, at a desert airfield. |
| Wrecked Martin Baltimore of the Royal Air Force on the Takoradi airport on 21st December 1942. |
| The crew of a Martin Baltimore of No. 69 Squadron RAF, disembark from their aircraft at Luqa, Malta, following a reconnaissance sortie. |
| While a formation flies overhead, other Martin Baltimores of No 223 Squadron stir up the dust on a Tunisian airfield (probably Ben Gardane). |
| Martin Baltimore. |
| Martin Baltimore serving with 13 Light Bomber Squadron, RHAF (Royal Hellenic Air Force). |
| Martin A-30 in USAAF colors prior to delivery. |
| A Royal Air Force Martin Baltimore GR.I. Photograph taken 14 June 1941. Most aircraft were delivered to Commonwealth countries, a few being kept in the U.S. under the USAAF designation A-30. |
| The Baltimore GR.IIIA variant supplied to the British under the Lend-Lease program. This variant was equipped with a dorsally mounted turret housing twin .50-caliber M2 machine guns. |
| Falconara, Italy. 1944. Aircrews who have returned from operational flights being debriefed by the Intelligence Officer on No. 454 (Baltimore) Squadron RAAF. |
| Falconara, Italy. 1944. RAAF personnel in the officer’s mess of No. 454 (Baltimore) Squadron RAAF, waiting for the dinner gong to summon them to a meal. |
| Western Desert, c. 1944. Members of 459 Squadron RAAF with one of the Squadron’s Martin Baltimore aircraft. |
| An example of nose art on the side of a Baltimore bomber, “Gentleman George,” of No. 459 Squadron RAAF. |
| A Martin Baltimore aircraft of No. 454 Squadron RAAF, flying over the Italian countryside on its way to a target area, in 1944. |
| Baltimore Mk. II, No. 55 Squadron RAF, Western Desert. |
| Baltimore Mk. III, Boscombe Down. |
| Baltimore Mk. IV, FA599, Eastleigh, Hampshire. |
| Baltimore, No. 454 Squadron RAAF. |
| Same Baltimore as in previous photo, No. 454 Squadron RAAF. |
| Baltimore, No. 454 Squadron RAAF. |
| Baltimore, No. 454 Squadron RAAF. |
| Baltimore, No. 454 Squadron RAAF. |
| Baltimores, No. 454 Squadron, RAAF. |
| Baltimores, January 16, 1943. |
| Baltimore FW793, “Glamorous Greta,” No. 454 Squadron RAAF. Last flight was on April 13, 1945. |
| Baltimore “Glamorous Greta.” |
| Cesenatico, Italy. c. November 1944. Martin Baltimore aircraft of No. 454 Squadron RAAF lined up for takeoff prior to a raid. |
| Cesenatico, Italy. c. November 1944. Martin Baltimore aircraft of No. 454 (Baltimore) Squadron RAAF lined up for take off prior to a raid. |
| Western Desert. c. 1942. The nose of a Glenn Martin Baltimore aircraft that belongs to No. 454 (Baltimore) Squadron RAAF operating from the Western Desert. |
| Italy. 1944-05-27. RAF Baltimore aircraft flying in formation on the way to attack heavy gun positions north west of Cassino. |
| Western Desert. c. 1942. Flight mechanics of No. 454 (Baltimore) Squadron RAAF in the Western Desert working on a squadron aircraft. |
| Western Desert. c. 1942. Flight mechanics of No. 454 (Baltimore) Squadron RAAF, in the Western Desert working on one of the squadron’s aircraft. |
| Western Desert. c. 1942. A group portrait of the Maintenance Section of No. 454 (Baltimore) Squadron RAAF in the Western Desert. |
| Western Desert. c. 1942. A maintenance fitter of No. 454 (Baltimore) Squadron RAAF works on an aircraft. |
| A Martin Baltimore attacks the retreating German columns after the second battle of El Alamein. |
| Baltimore Mk. I with Boulton Paul turret. |
| Baltimore of No. 69 Squadron destroyed while on the ground at Luqa, Malta, in 1942. |
| Baltimore, North Africa. |
| Baltimore I AG697 with single hand-operated gun in the mid-upper position. Note the all-plastic nose molding. |
| Baltimore I AG697 with single hand-operated gun in the mid-upper position. Note the all-plastic nose molding. |
| A formation of Baltimores over typical operational terrain the desert, where they played a prominent role with the Desert Air Force. |
| Baltimore II, probably AG743, at Fayid, Egypt on April 15, 1943. Note the twin Vickers guns in the mid-upper position. Power-operated turrets were introduced with the Baltimore III. |
| Baltimore II, probably AG743, at Fayid, Egypt on April 15, 1943. |
| Baltimore IIIA FA195, showing the Boulton Paul dorsal turret housing two 0 303 guns. The maximum speed of the Baltimore III was 300 m.p.h. at 11,000 ft, and it had a range of 950 miles. |
| Baltimore IIIA FA195 taking off from Gerbini 3, Sicily, on September 5, 1943. |
| Baltimore IV FA475 “D” of 232 Wing, RAF, at Gerbini 3, on September 5, 1943. |
| Baltimore IV FA475 “D” of 232 Wing, RAF, at Gerbini 3, on September 5, 1943. |
| Plan view of a Baltimore emphasizes the two main features which distinguished it from the Maryland, namely its pointed nose and the engine nacelles extending aft of the wing trailing edge. |
| Baltimore FA630. |
| A Martin Baltimore II taking off from a desert airfield, leaving a wake of sand behind it. |
| A Martin Baltimore II, identifiable by the twin machine guns in a manual mounting at the rear of the aircraft. |
| A flight of Martin Baltimores operating over the North African desert during the German retreat after the second battle of El Alamein. |
| Ex-RAF Baltimore IV bombers flying over the Balkans with the Stormo Baltimore of the Italian Co-Belligerent Air Force. |
| Falconara, Italy. c. November 1944. A Martin Baltimore aircraft and crew of No. 454 (Baltimore) Squadron RAAF, just prior to take off. |
| Bomb bay of Baltimore Mk. I, II and II. |
| Bomb rack diagram for Baltimore Mk. I and II. |
| Bomb bay door mechanism for Baltimore. |
| Martin Baltimore, from a wartime identification manual. |
| Martin Baltimore, from a wartime identification manual. |
| Martin Baltimore Mark V. |
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