North American A-36
Encyclopedia
The North American A-36 Apache (listed in some sources as "Invader", but also called Mustang) was the ground-attack/dive bomber
Dive bomber
A dive bomber is a bomber aircraft that dives directly at its targets in order to provide greater accuracy for the bomb it drops. Diving towards the target reduces the distance the bomb has to fall, which is the primary factor in determining the accuracy of the drop...

 version of the North American Aviation
North American Aviation
North American Aviation was a major US aerospace manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F-86 Sabre jet fighter, the X-15 rocket plane, and the XB-70, as well as Apollo Command and Service...

 P-51 Mustang
P-51 Mustang
The North American Aviation P-51 Mustang was an American long-range, single-seat fighter and fighter-bomber used during World War II, the Korean War and in several other conflicts...

, from which it could be distinguished by the presence of rectangular, slatted dive brake
Dive brake
Dive brakes or dive flaps are deployed to slow down an aircraft when in a dive. They usually consist of a metal flap that is raised against the air flow, thus creating drag and reducing dive speed....

s above and below the wings. A total of 500 A-36 dive bombers served in North Africa, the Mediterranean, Italy and the China-Burma-India theater
China Burma India Theater of World War II
China Burma India Theater was the name used by the United States Army for its forces operating in conjunction with British and Chinese Allied air and land forces in China, Burma, and India during World War II...

 during World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 before being withdrawn from operational use in 1944.

Design and development

With the introduction of the North American Mustang I with the RAF
Royal Air Force
The Royal Air Force is the aerial warfare service branch of the British Armed Forces. Formed on 1 April 1918, it is the oldest independent air force in the world...

 Army Co-operation Squadrons
RAF Army Cooperation Command
RAF Army Cooperation Command was a short-lived major command of the Royal Air Force during World War II, comprising the army cooperation units of the RAF.The command was formed on 1 December 1940 when No...

 in February 1942, the new fighter began combat missions as a low-altitude reconnaissance and ground-support aircraft. Supplementing the Curtiss P-40 Tomahawks already in service, Mustang Is were first supplied to No. 26 Squadron RAF
No. 26 Squadron RAF
No. 26 Squadron of the Royal Air Force was formed in 1915 and was disbanded for the last time in 1976.The squadron motto is N Wagter in die Lug , and the squadrons badge is a springbok's head couped.-1915 to 1918:...

, then rapidly deployed to ten additional squadrons by June 1942. First used in combat over the Dieppe Raid
Dieppe Raid
The Dieppe Raid, also known as the Battle of Dieppe, Operation Rutter or later on Operation Jubilee, during the Second World War, was an Allied attack on the German-occupied port of Dieppe on the northern coast of France on 19 August 1942. The assault began at 5:00 AM and by 10:50 AM the Allied...

 on 19 August 1942, a Mustang of No. 414 (RCAF) Squadron downed one of the formidable Focke-Wulf Fw 190
Focke-Wulf Fw 190
The Focke-Wulf Fw 190 Würger was a German Second World War single-seat, single-engine fighter aircraft designed by Kurt Tank in the late 1930s. Powered by a radial engine, the 190 had ample power and was able to lift larger loads than its well-known counterpart, the Messerschmitt Bf 109...

, the first victory for a Mustang. Despite the limited high-altitude performance of the Allison V-1710 engine, the RAF was enthusiastic about its new mount which "performed magnificently."

During the Mustang I's successful combat initiation, North American
North American Aviation
North American Aviation was a major US aerospace manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F-86 Sabre jet fighter, the X-15 rocket plane, and the XB-70, as well as Apollo Command and Service...

's president Howard "Dutch" Kindelberger
James H. Kindelberger
James H. "Dutch" Kindelberger was an American pioneer of aviation. He was also a leader of North American Aviation for a number of years. The International Aerospace Hall of Fame inducted Kindelberger in 1977....

 pressed the newly redesignated U.S. Army Air Forces (USAAF) for a fighter contract for the essentially similar P-51, 47 of which had passed into the USAAF when the Lend-Lease
Lend-Lease
Lend-Lease was the program under which the United States of America supplied the United Kingdom, the Soviet Union, China, Free France, and other Allied nations with materiel between 1941 and 1945. It was signed into law on March 11, 1941, a year and a half after the outbreak of war in Europe in...

 contract with Britain
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 ran out of funds. The P-51 used four 20 mm Hispano
Hispano-Suiza HS.404
The Hispano-Suiza HS.404 was an autocannon widely used as both an aircraft and land weapon in the 20th century by British, American, French, and numerous other military services. The cannon is also referred to as Birkigt type 404, after its designer. Firing a 20 mm caliber projectile, it delivered...

 wing cannon in place of the original four .30 in (7.62 mm) M1919 Browning machine gun
M1919 Browning machine gun
The M1919 Browning is a .30 caliber medium machine gun that was widely used during the 20th century. It was used as a light infantry, coaxial, mounted, aircraft, and anti-aircraft machine gun by the U.S. and many other countries, especially during World War II, the Korean War, and the Vietnam War...

s and two .50 in (12.7 mm) M2 Browning machine guns mounted in the wings and two .50 in (12.7 mm) "chin" machine guns. No funds were available for new fighter contracts in fiscal year 1942, but General Oliver P. Echols
Oliver P. Echols
Oliver Patton Echols was an American military officer who brought success in World War II to the United States Army Air Forces by expanding the inventory of America's air arm to meet the needs of the coming war. More than any other man under Chief of the Army Air Forces, General Henry H...

 and Fighter Project Officer Benjamin S. Kelsey
Benjamin S. Kelsey
Benjamin Scovill "Ben" Kelsey was an American aeronautical engineer and test pilot who brought success in World War II to the United States Army Air Forces by initiating the manufacture of innovative fighter aircraft designs, and by working to quickly increase American fighter production to meet...

 wanted to ensure the P-51 remained in production.

Since appropriations were available for an attack aircraft, Echols specified modifications to the P-51 to turn it into a dive bomber. The contract for 500 A-36A aircraft fitted with bomb racks and dive brakes was signed by Kelsey on 16 April 1942 even before the first flight of the first production P-51 in May 1942. With orders on the books, North American Aviation (NAA) began modifying the P-51 to accept the bomb shackles which had already been tested in a "long-range ferry" program RAF had stipulated. Engineering studies totaling 40,000 hours and wind tunnel testing with a ⅛-scale model was completed in June 1942. Utilizing the basic P-51 airframe and Allison engine, structural reinforcing "beefed up" several high stress areas and "a set of hydraulically operated dive brakes were installed in each main wing plane." Due to the slightly inboard placement of the bomb racks and unique installation of four cast aluminum dive brakes, a complete redesign of the P-51 wing was required.
The first A-36A (42-83663) was rolled out of the NAA Inglewood plant in September 1942, rapidly going through flight testing with the first flight in October, with deliveries commencing soon after of the first production machines emerged. The A-36A continued the use of nose-mounted .50 in (12.7 mm) machine guns along with wing armament of four .50 in (12.7 mm) caliber machine guns. The USAAF envisaged that the dive bomber would operate mainly at altitudes below 12,000 ft (3,658 m) and specified the use of a sea level-rated Allison V-1710-87, driving a 10 ft 9 in (3.28 m)-diameter three bladed Curtiss-Electric propeller and delivering 1,325 hp (988 kW) at 3,000 ft (914 m). The main air scoop inlet was redesigned to become a fixed unit with a larger opening, replacing the earlier scoop which could be lowered into the airstream. In addition the A-36 carburetor air intake was later fitted with a tropical air filter to stop sand and grit being ingested into the engine.

The USAAF later ordered 310 P-51As which were essentially A-36s without the dive-brakes and nose mounted weapons, leaving an armament of four wing-mounted 0.50 in (12.7 mm) Browning machine guns. An Allison V-1710-81 1,200 hp
Horsepower
Horsepower is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.Horsepower was originally defined to compare the output of steam engines with the power of draft horses in continuous operation. The unit was widely adopted to measure the...

 (895 kW) was fitted and used the same radiator and air intake as the A-36A. The P-51A was still fitted with bomb racks although it was not intended to be used primarily as a fighter-bomber and the racks were mainly used to carry drop-tanks.

Operational history

The A-36A-1-NA "Apache" (although Apache was the A-36A's official name, it was rarely used) joined the 27th Fighter Bomber Group composed of four squadrons based at Rasel Ma in French Morocco in April 1943 during the campaign in North Africa
Operation Torch
Operation Torch was the British-American invasion of French North Africa in World War II during the North African Campaign, started on 8 November 1942....

. The 27th had a mixed component of Douglas A-20 Havocs and A-36As while the second operational unit, the 86th Fighter Bomber Group (Dive) arrived in March 1943 with the first pilots trained and qualified on the A-36A. On 6 June 1943, both of these A-36A units flew combat missions directed against the island of Pantelleria. The island fell to Allied attack and became the home base for the two A-36A groups during the invasion of Sicily. The A-36A proved to be a potent weapon; it could be put into a vertical dive at 12,000 ft (3,658 m), deploying its dive brakes, limiting the dive speed to 390 mph (628 km/h). Pilots soon recognized that extending the dive brakes after "peel-off" led to some unequal extension of the brakes due to varying hydraulic pressure, setting up an invariable slight roll which impeded aiming. Proper technique soon cured this anomaly and, subsequently, pilots achieved extremely consistent results. Depending on the target and defences, the bomb release took place between 2,000 ft and 4,000 ft (610 and 1,219 m), followed by an immediate sharp "pull up."

Dive brakes in the wings gave the A-36A greater stability in a dive; however, a myth has arisen that they were useless due to malfunctions or because of the danger of deploying them and that they should be wired closed. Capt. Charles E. Dills, 27th Fighter-Bomber Group, 522d Fighter Squadron, XIIth Air Force emphatically stated in a postwar interview: "I flew the A-36 for 39 of my 94 missions, from 11/43 to 3/44. They were never wired shut in Italy in combat. This 'wired shut' story apparently came from the training group at Harding Field, Baton Rouge, LA."
However, tactical reconnaissance training with P-51 and A-36 aircraft had delivered some disquieting accident rates. At one time, A-36 training had resulted in the type having "the highest accident rate per hour's flying time" of any USAAF aircraft. The most serious incident involved an A-36A shedding both wings when its pilot tried to pull out from a 450 mph (724 km/h) dive. Combat units flying the A-36A were ordered to restrict their approach to a 70° "glide" attack and refrain from using dive brakes. This order was generally ignored by experienced pilots but some units did wire dive brakes shut until modifications were made to the hydraulic actuators. Nevertheless, the A-36 was used with great success as a dive-bomber, acquiring a reputation for precision, sturdiness and silence.

By late May 1943, 300 A-36As had been deployed to the Mediterranean Theater, with many of the first batch sent to the 27th to re-build the group following losses as well as completing the final transition to an all-A-36A unit.Both groups were actively involved in air support during the Sicilian campaign, becoming especially adept at "mopping" up enemy gun positions and other strong points as the Allies advanced. During this operation, the 27th Group circulated a petition to adopt the name "Invader" for their rugged little bomber, receiving unofficial recognition of the more fitting name. Despite the name change, most combat reports preferred the name "Mustang" for all of the variants. The Germans gave it a flattering if fearsome accolade, calling the A-36As, "screaming helldivers."

Besides dive bombing, the A-36A racked up aerial victories, totalling 84 enemy aircraft downed and creating an "ace", Lieutenant Michael T. Russo from the 27th Fighter Bomber Group (ultimately, the only ace using the Allison-engined Mustang). As fighting intensified in all theaters where the A-36A operated, the dive bomber began to suffer an alarming loss rate with 177 falling to enemy action. The main reason for the attrition was the hazardous missions that placed the A-36A "on the deck" facing murderous ground fire. German defences in southern Italy included placing cables across hill tops to snare the attacking A-36As. Despite establishing a "reputation for reliability and performance, "the one "Achilles' heel" of the A-36A (and the entire Mustang series) remained its vulnerable cooling system leading to many of the losses. By June 1944, A-36As in Europe were replaced by Curtiss P-40
Curtiss P-40
The Curtiss P-40 Warhawk was an American single-engine, single-seat, all-metal fighter and ground attack aircraft 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...

s and Republic P-47 Thunderbolt
P-47 Thunderbolt
Republic Aviation's P-47 Thunderbolt, also known as the "Jug", was the largest, heaviest, and most expensive fighter aircraft in history to be powered by a single reciprocating engine. It was heavily armed with eight .50-caliber machine guns, four per wing. When fully loaded, the P-47 weighed up to...

s.
A-36As had also served with the 311th Fighter Bomber Group in the China-Burma-India theater
China Burma India Theater of World War II
China Burma India Theater was the name used by the United States Army for its forces operating in conjunction with British and Chinese Allied air and land forces in China, Burma, and India during World War II...

. The 311th had arrived in Dinjan, India by late summer 1943 after being shipped across the Pacific via Australia. Two squadrons were equipped with the A-36A while the third flew P-51As. Tasked with reconnaissance, dive bombing, attack and fighter missions, the A-36A was outclassed by its main opposition, the Nakajima Ki-43
Nakajima Ki-43
The Nakajima Ki-43 Hayabusa was a single-engine land-based tactical fighter used by the Imperial Japanese Army Air Force in World War II...

 "Oscar." The light and highly agile Japanese fighter could outmaneuver the A-36A at all altitudes but did have some weak points: it was lightly armed and offered little protection for pilot or fuel tanks. However, the A-36A fought at a significant disadvantage, having to carry out long-range missions often at altitudes above the "Hump" that meant its Allison engine was below peak performance. In a fighter escort mission over Burma, three A-36As were lost without scoring a single victory. The A-36A CBI missions continued throughout 1943–1944 with indifferent results. The A-36A remained in service in small numbers throughout the remaining year of the war, some being retained in the US as training aircraft.

"The type's relatively brief service life should not camouflage the fact that it made a major contribution to the Allied war effort" especially in the Mediterranean and it amounted to the first USAAF combat use of a Mustang variant. The effectiveness of the A-36 as a ground attack aircraft was demonstrated on 5 June 1944. In a well planned attack on the large, well defended rail depot and ammo dump at Orte, Italy, Lieutenant Ross C. Watson lead a flight of four A-36s through a heavy overcast on the approach to the target. Watson's A-36s scored several hits under intense anti aircraft fire while Lt. Watson's aircraft was hit and damaged by ground fire. Under continuing heavy ground fire. Lt. Watson pressed home his attack and destroyed the ammo dump before making an emergency landing at an advanced Allied airfield.

Operators

    • US Army Air Force
27th Fighter-Bomber Group
86th Fighter-Bomber Group
311th Fighter Bomber Group

    • RAF
One A-36A was supplied to the RAF in March 1943 for experimental purposes. Its RAF serial number
United Kingdom military aircraft serials
In the United Kingdom to identify individual aircraft, all military aircraft are allocated and display a unique serial number. A unified serial number system, maintained by the Air Ministry , and its successor the Ministry of Defence , is used for aircraft operated by the Royal Air Force , Fleet...

 was EW998.

Survivors

Relatively few A-36As survived the war and the subsequent postwar retirement and scrapping of obsolete types. One A-36A, bearing race number #44, owned and flown by Kendall Everson, was entered in the 1947 Kendall Trophy Race. The old warhorse was able to reach 377.926 mph, finishing second to the winning P-51D flown by Steve Beville.
  • A-36A Apache, s/n 42-83665, is on display at the National Museum of the United States Air Force
    National Museum of the United States Air Force
    The National Museum of the United States Air Force is the official museum of the United States Air Force located at Wright-Patterson Air Force Base northeast of Dayton, Ohio. The NMUSAF is the world's largest and oldest military aviation museum with more than 360 aircraft and missiles on display...

     in Dayton, Ohio
    Dayton, Ohio
    Dayton is the 6th largest city in the U.S. state of Ohio and the county seat of Montgomery County, the fifth most populous county in the state. The population was 141,527 at the 2010 census. The Dayton Metropolitan Statistical Area had a population of 841,502 in the 2010 census...

    . It was obtained from Charles P. Doyle of Rosemount, Minnesota
    Rosemount, Minnesota
    As of the census of 2000, there were 14,619 people, 4,742 households, and 3,931 families residing in the city. The population density was 434.2 people per square mile . There were 4,845 housing units at an average density of 143.9 per square mile...

     in 1971. This aircraft was restored by the 148th Fighter-Interceptor Group of the Minnesota Air National Guard
    Minnesota Air National Guard
    The Minnesota Air National Guard is the air force militia of the U.S. state of Minnesota. It is, along with the Minnesota Army National Guard, an element of the Minnesota National Guard.-Mission:...

     under the command of Colonel
    Colonel
    Colonel , abbreviated Col or COL, is a military rank of a senior commissioned officer. It or a corresponding rank exists in most armies and in many air forces; the naval equivalent rank is generally "Captain". It is also used in some police forces and other paramilitary rank structures...

     Wayne C. Gatlin. It is displayed as "Margie H", the A-36A flown by Captain Lawrence Dye of the 16th Fighter-Bomber Squadron in Tunisia, Sicily and Italy.

  • A-36A Apache, s/n 42-83731, is airworthy and owned by Chino Warbirds Inc. in Houston, Texas
    Houston, Texas
    Houston is the fourth-largest city in the United States, and the largest city in the state of Texas. According to the 2010 U.S. Census, the city had a population of 2.1 million people within an area of . Houston is the seat of Harris County and the economic center of , which is the ...


  • A-36A Apache, s/n 42-83738, is under restoration to airworthiness by the Collings Foundation in Stow, Massachusetts
    Stow, Massachusetts
    Stow is a town in Middlesex County, Massachusetts, United States. The population was 6,590 at the 2010 census.- History :Stow was first settled c. 1660 by Matthew Boon and John Kettell...


Specifications (A-36A)

See also

External links

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