B-10 | |
---|---|
General information | |
Type | Bomber aircraft |
Manufacturer | Glenn L. Martin Company |
Designer | |
Primary users | United States Army Air Corps |
Number built | 121 B-10 82 model 166 32 B-12 348 of all variants including 182 export versions |
History | |
Manufactured | 1933–1940 |
Introduction date | November 1934 |
First flight | 16 February 1932 |
Retired | 1949 (Royal Thai Air Force) |
Variants | Martin Model 146 |
The Martin B-10 was the first all-metal monoplane bomber to be regularly used by the United States Army Air Corps, having entered service in June 1934. [1] It was also the first mass-produced bomber whose performance was superior to that of the Army's pursuit aircraft of the time. [2]
The B-10 served as the airframe for the B-12, B-13, B-14, A-15 and O-45 designations using Pratt & Whitney engines instead of Wright Cyclones. A total of 348 of all versions were built. The largest users were the US, with 166, and the Netherlands, with 121.
The B-10 began a revolution in bomber design. Its all-metal monoplane airframe, along with its features of closed cockpits, rotating gun turrets (almost simultaneously with the 1933 British Boulton & Paul Overstrand biplane bomber's own enclosed nose-turret), retractable landing gear, internal bomb bay, and full engine cowlings, became the standard for bomber designs worldwide for decades. [2] It made all existing bombers completely obsolete. Martin received the 1932 Collier Trophy for designing the XB-10. [3]
The B-10 began as the Martin Model 123, a private venture by the Glenn L. Martin Company of Baltimore, Maryland. It had a crew of four: pilot, copilot, nose gunner and fuselage gunner. As in previous bombers, the four crew compartments were open, but it had a number of design innovations as well. [4] [5]
These innovations included a deep belly for an internal bomb bay and retractable main landing gear. Its 600 hp (450 kW) Wright SR-1820-E Cyclone engines provided sufficient power. The Model 123 first flew on 16 February 1932 and was delivered for testing to the U.S. Army on 20 March as the XB-907. After testing it was sent back to Martin for redesigning and was rebuilt as the XB-10. [4] [5]
The XB-10 delivered to the Army had major differences from the original aircraft. Where the Model 123 had Townend rings, the XB-10 had full NACA cowlings to decrease drag. [6] It also sported a pair of 675 hp (503 kW) Wright R-1820-19 engines, and an 8 feet (2.4 m) increase in the wingspan, along with an enclosed nose turret. When the XB-10 flew during trials in June, it recorded a speed of 197 mph (317 km/h) at 6,000 ft (1,800 m). This was an impressive performance for 1932. [2]
Following the success of the XB-10, a number of changes were made, including reduction to a three-man crew and addition of canopies for all crew positions. The Army ordered 48 of these on 17 January 1933. The first 14 aircraft were designated YB-10 and delivered to Wright Field, starting in November 1933, and used in the Army Air Corps Mail Operation. The production model of the XB-10, the YB-10, was very similar to its prototype.[ citation needed ]
This section needs expansion. You can help by adding to it. (July 2016) |
In 1935, the Army ordered an additional 103 aircraft designated B-10B. These had only minor changes from the YB-10. Shipments began in July 1935. B-10Bs served with the 2d Bomb Group at Langley Field, the 9th Bomb Group at Mitchel Field, the 19th Bomb Group at March Field, the 6th Composite Group in the Panama Canal Zone, and the 4th Composite Group in the Philippines. In addition to conventional duties in the bomber role, some modified YB-10s and B-12As were operated for a time on large twin floats for coastal patrol. [7] [8]
In February 1936, the US Army Air Corps used 13 B-10Bs of the 49th Bomb Squadron to drop supplies to the residents of Virginia's Tangier Island and Maryland's Smith Island; with ships unable to reach the islands due to heavy ice in the Chesapeake Bay, the islanders faced starvation after a severe winter storm. The B-10B supply flights followed earlier supply flights to the islands by the Goodyear Blimp Enterprise on 2 February 1936 and by the squadron's Keystone B-6A bombers on 9 and 10 February 1936. [9] [10]
With its advanced performance, the Martin company fully expected that export orders for the B-10 would flood in. The U.S. Army owned the rights to the Model 139 design. Once the Army's orders had been filled in 1936, Martin received permission to export Model 139s, and delivered versions to several air forces. These included six Model 139Ws sold to Siam in April 1937, powered by Wright R-1820-G3 Cyclone engines, and 20 Model 139Ws sold to Turkey in September 1937, powered by R-1820-G2 engines.[ citation needed ]
ROCAF purchased the 139WC in 1936, When introduced, it was the fastest aircraft in China.
The 139WC was primarily used for night bombing and maritime reconnaissance. [11]
On 25 August 1937, as the air battles intensified in the early part of the Second Sino-Japanese War, [12] five Chinese Nationalist Air Force bombers of the 8th BG, 19th and 30th Squadrons consisting of three Heinkel He 111As and two Martin B-10s, flying from their base in Nanjing to Shanghai, successfully dropped their bombs on Japanese landing forces at Liuhe, Taicang, northwest of Shanghai. However, Japanese aircraft pursued the bombers and shot up two of the Heinkels, forcing them to crash land; two crew members were killed on the ground by Japanese aircraft strafing them. [13] [14]
As the National Revolutionary Army of China fought desperately to hold onto their remaining positions in the Battle of Shanghai, the Chinese Air Force launched a major strike with a motley mix of aircraft against Japanese positions in Shanghai on 14 October 1937, consisting of three B-10s, two Heinkel He 111As, five Douglas O-2MCs, five Northrop Gammas, and three Curtiss Hawk IIIs from Nanjing in the late afternoon; in the evening, one bomber was launched every hour from Nanjing to attack Japanese positions in Shanghai until 03:00 on 15 October.
On 19 May 1938, two B-10s of the 2nd BG, 14th Squadron, led by Capt. Hsu Huan-sheng and Lt. Teng Yen-bo, successfully flew the first air raid on mainland Japan.
During an unescorted nighttime raid over Japan, the B-10s dropped 2 million leaflets, "alerting the conscience of the Japanese people against atrocities committed by the Japanese invasion and occupation of China", over the cities of Nagasaki, Fukuoka, Kurume, Saga, and others, while reconnoitering airbases, ports, warships and factories. [15] [16] [17] [18] [19]
In the mid-1930s, the Netherlands government adopted a doctrine for defense of the Netherlands East Indies, which relied on the use of land-based bombers against any attacking force, with orders for defensive fighters cancelled to pay for the bomber force. The Martin 139 was chosen in preference to the Dutch Fokker T.V, as its all metal construction was considered more robust than the steel tube and fabric Fokker, while the Martin bomber was also already in production and therefore would be available sooner. [20] Twelve Martin 139 WH-1s were ordered for the Royal Netherlands East Indies Army Air Force (ML-KNIL) in 1936, followed by 26 improved WH-2s in March 1937, sufficient bombers to equip a Group of three squadrons. [21] In December 1937, an order was placed for 39 Martin 139 WH-3s, followed by an order for 40 Martin 139 WH-3As in November 1938. Two more Martin 139 WH-3As were ordered in July 1939 to replace aircraft lost during delivery. The last of these attrition replacement aircraft was delivered in March 1940, including the last Martin B-10/139 built. [22] On the outbreak of war with Japan in December 1941, about 58 Martins (WH-3 and WH-3As) were operational with six squadrons, with about 20 more of the older variants in reserve. [23] B-10s of the ML-KNIL served in the defense of the Dutch East Indies.
During the start of Pacific War, Dutch Martin units were as follows: [24]
In efforts to reinforce the British defense of the Malay Peninsula, the Dutch East Indies sent some ML-KNIL squadrons. Included were 22 Martin 139s from VLG-III that were organized into three squadrons, which arrived at Singapore on 9 December 1941. Due to a lack of coordination, British AA mistook the Dutch Martins for enemy aircraft and engaged them as they neared Singapore. The Martins were then stationed at Sembawang. [25] In early January 1942, Dutch Martins along with British Blenheim bombers sortied over the west coast of Malaya to halt the Japanese advance. [26] On 8 January, nine Martin and four Australian Hudson attacked a suspected Japanese seaplane tender anchored offshore in South China Sea, but the results were inconclusive. In the next day, nine Martin "quite successfully" bombed several Japanese ships unloading cargo at Kuantan. [27] Two Martins were shot down by the Japanese near Penang on 1 January, while a further four Martins were lost while attacking Japanese forces on the Muar River on 19 January. On the same day, Dutch fighter squadrons were withdrawn to Sumatra, while the Martins were also withdrawn to Java three days later. [28]
Six B-10s formed the medium bomber force of the Royal Thai Air Force at the start of the 1940–1941 Franco-Thai War. [29] They flew several bombing missions during the war, with their first mission against Xieng Khuang, Laos and a nearby airfield on 15 December 1940, [30] with the last mission, against Sisophon in what is now Cambodia on 28 January at the very end of the Franco-Thai War. [31] Later on, B-10s had been assigned to the airfield in Phrae as a part of Phayap Army to invade Shan state. [32]
After being delivered in September 1937, the Martin 139WTs were assigned to the 55th and 56th Tayyare Bölüğü (Aviation Squadrons) of the 9th Tayyare Taburu (Aviation Battalion). [33] During the Second World War, the aircraft were extensively deployed for surveillance over the Black Sea. [34] After being replaced by British Blenheims and Beauforts in 1944, the Martin 139WTs served as backup aircraft until 1946, when twelve of the sixteen remaining aircraft were still operational. [33]
At the time of its creation, the B-10B was so advanced that General Henry H. Arnold described it as the airpower wonder of its day. It was half again as fast as any biplane bomber, and faster than any contemporary fighter. The B-10 began a revolution in bomber design, making existing bombers completely obsolete. [6]
Rapid advances in bomber design in the late 1930s meant that the B-10 was eclipsed by the time the United States entered World War II. The Model 139s in combat in China and South East Asia suffered the same disadvantages as the other early war medium bombers, i.e. not enough armor and guns, while it could not outrun the latest fighters.
An abortive effort to modernize the design, the Martin Model 146, was entered into a USAAC long-distance bomber design competition in 1934–5. The bomber came in a strong second place and was bested by only the Boeing B-17 in range and endurance. However, it had a higher ceiling of 28,500 ft (8,700 m), was only 2 mph (3 km/h) slower, and carried 313 lb (142 kg) less in bombs than the Boeing, at over half the cost. Nonetheless, the design was seen as a dead end, and the third-place contender, the Douglas B-18, was selected instead. [35]
Private venture of Martin company, predecessor of the XB-10, served as prototype for the series, one built. [36]
Army Air Corps versions, 165 built.
The export versions, 100 built (182 including the Model 166, see below).
Final version, a.k.a. 139WH-3 and 139WH-3A, 82 built.
Data fromUnited States Military Aircraft Since 1909. [54]
General characteristics
Performance
Armament
Aircraft of comparable role, configuration, and era
Related lists
The Boeing B-17 Flying Fortress is an American four-engined heavy bomber aircraft developed in the 1930s for the United States Army Air Corps (USAAC). A fast and high-flying bomber of its era, the B-17 was used primarily in the European Theater of Operations and dropped more bombs than any other aircraft during World War II. It is the third-most produced bomber of all time, behind the American four-engined Consolidated B-24 Liberator and the German multirole, twin-engined Junkers Ju 88. It was also employed as a transport, antisubmarine aircraft, drone controller, and search-and-rescue 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.
The Brewster F2A Buffalo is an American fighter aircraft which saw service early in World War II. Designed and built by the Brewster Aeronautical Corporation, it was one of the first U.S. monoplanes with an arrestor hook and other modifications for aircraft carriers. The Buffalo won a competition against the Grumman F4F Wildcat in 1939 to become the U.S. Navy's first monoplane fighter aircraft. Although superior to the Grumman F3F biplane it replaced, and the early F4Fs, the Buffalo was largely obsolete when the United States entered the war, being unstable and overweight, especially when compared to the Japanese Mitsubishi A6M Zero.
The Douglas B-18 Bolo is an American twin-engined heavy bomber which served with the United States Army Air Corps and the Royal Canadian Air Force during the late 1930s and early 1940s. The Bolo was developed by the Douglas Aircraft Company from their DC-2 as a replacement for the Martin B-10.
The Convair B-36 "Peacemaker" is a strategic bomber built by Convair and operated by the United States Air Force (USAF) from 1949 to 1959. The B-36 is the largest mass-produced piston-engined aircraft ever built, although it was exceeded in span and weight by the one-off Hughes Hercules. It also has the longest wingspan of any combat aircraft. The B-36 is capable of intercontinental flight without refueling.
The Consolidated B-32 Dominator was an American heavy strategic bomber built for United States Army Air Forces during World War II, which had the distinction of being the last Allied aircraft to be engaged in combat during World War II; that engagement also resulted in the last American to die in air combat in World War II. It was developed by Consolidated Aircraft in parallel with the Boeing B-29 Superfortress as a fallback design should the B-29 prove unsuccessful. The B-32 reached units in the Pacific only in mid-May 1945, and subsequently saw only limited combat operations against Japanese targets before the formal end of the war on 2 September 1945. Most of the extant orders of the B-32 were canceled shortly thereafter and only 118 B-32 airframes of all types were built.
The Northrop YB-35/XB-35, Northrop designation N-9 or NS-9, were experimental heavy bomber aircraft developed by the Northrop Corporation for the United States Army Air Forces during and shortly after World War II. The airplane used the radical and potentially very efficient flying wing design, in which the tail section and fuselage are eliminated and all payload is carried in a thick wing. Only prototypes and pre-production aircraft were built, although interest remained strong enough to warrant further development of the design as a jet bomber, under the designation YB-49.
The Boeing XB-15 was a United States bomber aircraft designed in 1934 as a test for the United States Army Air Corps (USAAC) to see if it would be possible to build a heavy bomber with a 5,000 mi (8,000 km) range. For a year beginning in mid-1935 it was designated the XBLR-1. When it first flew in 1937, it was the most massive and voluminous airplane ever built in the US. It set a number of load-to-altitude records for land-based aircraft, including carrying a 31,205 lb (14,154 kg) payload to 8,200 ft (2,500 m) on 30 July 1939.
The Keystone B-6 was a biplane bomber developed by the Keystone Aircraft company for the United States Army Air Corps.
The Douglas XB-19 was a four-engined, piston-driven heavy bomber produced by the Douglas Aircraft Company for the United States Army Air Forces (USAAF) during the early 1940s. The design was originally given the designation XBLR-2. It was the largest bomber built for the USAAF until 1946, with the Convair B-36 surpassing it in size.
The North American XB-21 and sometimes referred to by the name "Dragon", was a prototype bomber aircraft developed by North American Aviation in the late 1930s, for evaluation by the United States Army Air Corps. Evaluated against the Douglas B-18 Bolo, it was found to be considerably more expensive than the rival aircraft, and despite the ordering of a small number of evaluation aircraft, only the prototype was ever built.
The North American XB-28 (NA-63) was an aircraft proposed by North American Aviation to fill a strong need in the United States Army Air Corps for a high-altitude medium bomber. It never entered production, with only two prototypes being built.
The Martin XB-33 Super Marauder was a proposed World War II American bomber aircraft. It was designed by the Glenn L. Martin Company as the Martin Model 190 and was a high-altitude derivative of the company's B-26 Marauder. Two different designs were developed, first as a twin-engined aircraft and then as a four-engined aircraft. The four-engined version was ordered by the United States Army Air Forces, but the program was cancelled before any aircraft were built.
The Boeing B-29 Superfortress is a WWII era long range, strategic heavy bomber that was produced in many experimental and production models.
The development of the Convair B-36 strategic bomber began in 1941 with the XB-36, which was intended to meet the strategic needs of the US Army Air Forces, and later of the United States Air Force with its Strategic Air Command. In 1948, the B-36 become a mainstay of the American nuclear deterrent. It underwent a number of design changes before being withdrawn from service in 1959. It was also well suited to high altitude very long range reconnaissance missions, and several alterations were made with this mission profile in mind.
The Consolidated XB-41 Liberator was a single Consolidated B-24D Liberator bomber, serial 41-11822, which was modified for the long-range escort role for U.S. Eighth Air Force bombing missions over Europe during World War II.
The Curtiss-Wright Model 21 was an American fighter-interceptor developed by the St. Louis Airplane Division of Curtiss-Wright Corporation during the 1930s.
The Boeing YB-9 was the first all-metal monoplane bomber aircraft designed for the United States Army Air Corps. The YB-9 was a much enlarged twin-engine development of Boeing's single-engine Model 200 Monomail commercial transport.
The Curtiss BF2C Goshawk was a United States 1930s naval biplane aircraft that saw limited success and was part of a long line of Hawk Series airplanes made by the Curtiss Aeroplane and Motor Company for the American military, and for export as the Model 68 Hawk III.