Curtiss P-36 Hawk

P-36 Hawk/Hawk 75/Mohawk
Role Fighter
Manufacturer Curtiss-Wright Corporation
Designed by Donovan Berlin
First flight 6 May 1935
Introduced 1938
Retired 1954, Argentina
Primary users United States Army Air Corps
Finnish Air Force
French Air Force
Royal Air Force
Number built 215 (P-36) plus 900 export Hawk 75 variants
Unit cost $23,000[1]

The Curtiss P-36 Hawk, also known as the Curtiss Hawk Model 75, was an American designed and built fighter aircraft of the 1930s and 40s. A contemporary of the much superior Hawker Hurricane and Messerschmitt Bf 109, it was one of the first of a new generation of combat aircraft—a sleek monoplane design making extensive use of metal in its construction and powered by a powerful radial engine. Obsolete at the onset of World War II and best known as the predecessor of the Curtiss P-40, the P-36 saw only limited combat with the United States Army Air Forces, but it was used more extensively by the French Air Force, both during the Battle of France and by the Vichy France armed forces, and also by the British Commonwealth (where it was known as the Mohawk), and Chinese air units. Several dozen also fought in the Finnish Air Force against the Soviet Air Forces. With around 1,000 aircraft built, the P-36 was a major commercial success for Curtiss. This article also covers the YP-37 and the XP-42 prototypes based on the P-36.

Contents

Design and development

The Curtiss Model 75 was a private venture by the company, designed by former Northrop Aircraft Company engineer Donovan Berlin. The first prototype constructed in 1934 featured all-metal construction with fabric-covered control surfaces, a Wright XR-1670-5 radial engine developing 900 hp (671 kW), and typical U.S. Army Air Corps armament of one 0.3 in (7.62 mm) and one 0.5 in (12.7 mm) machine guns firing through the propeller arc. Also typical of the time was the total absence of cockpit armor or self-sealing fuel tanks. The distinctive landing gear which rotated 90° to fold the main wheels flat into the thin trailing portion of the wing was actually a Boeing-patented design for which Curtiss had to pay royalties.

P-36 Hawk

The prototype first flew on 6 May 1935, reaching 281 mph (452 km/h) at 10,000 ft (3,050 m) during early test flights. On 27 May 1935, the prototype was flown to Wright Field, Ohio, to compete in the USAAC fly-off for a new single-seat fighter but the contest was delayed because the Seversky entry crashed on the way to the contest. Curtiss took advantage of the delay to replace the unreliable engine with a Wright XR-1820-39 Cyclone producing 950 hp (709 kW) and to rework the fuselage, adding the distinctive scalloped rear windows to improve rear visibility. The new prototype was designated Model 75B with the R-1670 version retroactively designated Model 75D. The fly-off finally took place in April 1936. Unfortunately, the new engine failed to deliver its rated power and the aircraft attained only 285 mph (460 km/h).

Although its competitor, the Seversky P-35, also underperformed and was more expensive, it was still declared the winner and awarded a contract for 77 aircraft. Then, on 16 June 1936, Curtiss received an order from USAAC for three prototypes designated Y1P-36. The USAAC was concerned about political turmoil in Europe and about Seversky's ability to deliver P-35s in a timely matter, and therefore wanted a backup fighter. The Y1P-36 (Model 75E) was powered by a Pratt & Whitney R-1830-13 Twin Wasp engine producing 900 hp (671 kW) and further enlarged scalloped rear canopy. The new aircraft performed so well that it won the 1937 USAAC competition with an order for 210 P-36A fighters.

Curtiss YP-37

Curtiss YP-37
Curtiss XP-42 (USAF Photo)

In early 1937, the USAAC ordered Curtiss to adapt one P-36 to the new liquid-cooled turbo-supercharged Allison V-1710 engine with 1,150 hp (858 kW). Designated XP-37, the aircraft used the original Model 75 airframe with radiators mounted on the sides of the fuselage around the engine. The cockpit was moved far to the rear to make room for the radiators and the bulky turbocharger system, and to balance the aircraft. The aircraft flew in April 1937, reaching 340 mph (547 km/h) at 20,000 ft (6,100 m). Although the turbo-supercharger was extremely unreliable and visibility from the cockpit on takeoff and landing was virtually nonexistent, the USAAC was sufficiently intrigued by the promised performance to order 13 service test YP-37s. Featuring improved aerodynamics and a more reliable turbo-supercharger, the aircraft first flew in June 1939. However, the powerplant remained unreliable and the project was cancelled in favor of another Curtiss design, the P-40.

Curtiss XP-42

In an attempt to improve the aerodynamics of the air-cooled piston engines, the fourth production P-36A (serial 38-004), designated the XP-42, was equipped with a long streamlined cowling resembling that of a liquid-cooled engine. Twelve different designs were tried with little success - although the aircraft was faster than a standard P-36A, engine cooling problems were never resolved. Since the new P-40 was faster, the project was cancelled. Late in its service life, the sole XP-42 was fitted with an all-moving tailplane and used to study that control configuration.

Operational history

Argentina

Argentina bought a number of the simplified, fixed landing gear Hawk 75Os, (intended for rough-field operations and ease of maintenance) and purchased a manufacturing license for the type. These aircraft used the same engine, Wright Cyclone R-1820-G5 as the Martin 139WAA's (B-10) and Northrop 8A-2s used by the Argentine Army Aviation at the time. Usually armed with 1 x 11.35 mm Madsen machine gun and 3 x 7.65 mm Madsen light machine guns, there was provision for up to 10 bombs of 30 pounds each on underwing pylons. The last Argentinian Hawks remained in service until November 1954.[2]

Brazil

In March 1942, 10 USAAC P-36As were transferred to Brazil.

British Commonwealth

RAF Mohawk IVs in India in January 1943

The Royal Air Force (RAF) also displayed interest in the aircraft. Comparison of a borrowed French Hawk 75A-2 with a Supermarine Spitfire Mk I revealed that the Hawk had several advantages over the early variant of the iconic British fighter. The Hawk was found to have lighter controls than the Spitfire at speeds over 300 mph (480 km/h), especially in diving attacks, and was easier to maneuver in a dogfight (thanks to the less sensitive elevator) and better all-around visibility. The Hawk was also easier to control on takeoff and landing. Not surprisingly, the Spitfire's superior acceleration and top speed ultimately gave it the advantage of being able to engage and leave combat at will.

Although Britain decided not to purchase the aircraft, they soon came in possession of 229 Hawks by way of diverted shipments to occupied France and aircraft flown by escaping French pilots. The aircraft received the designations Mohawk I through IV, mirroring French Hawk 75A-1 through A-4, and were fitted with 0.303-cal. Vickers K machine guns and conventional throttles (forward to increase power).[3]

Although they were considered obsolete, a number saw service with the RAF and Royal Indian Air Force (RIAF) in India and Burma. In April 1941, the British government of India ordered 48 Cyclone-powered Mohawk IVz (Hawk 75A) for the RIAF, to be built by Hindustan Aircraft. The first such machine completed was test flown on 31 July 1942. However, only four additional aircraft were completed before the project was abandoned. The Indian-built machines were used by RAF/RIAF units. Similarly, Chinese license production of the Hawk 75A-5 was moved to India, and these machines were also absorbed into RAF as Mohawk IVs. These aircraft were supplemented by 10 Hawk 75A-9s captured during the Anglo-Soviet invasion of Iran in August 1941,[4] while 74 ex-French Mohawk IVs were shipped to India from the United Kingdom.[3] The only RAF units to see combat in Mohawks were No. 5 Squadron RAF and No. 155 Squadron RAF, using the type mainly for Bomber escort and ground attack. The type was retired by the RAF/RIAF in 1944.[5]

The South African Air Force received 72 Mohawks. Its first Mohawks were delivered to East Africa in mid-1941, where they were used by 3 Squadron SAAF to support operations in the East African Campaign, taking part in the Battle of Gondar which ended the campaign, and helping to patrol the border with Vichy French held Djibouti.[6] These Mohawks were then sent to South Africa, where, supplemented by fresh deliveries, they were used for training and for home defence.[7]

China

The prototype of the Hawk 75H - a simplified version with fixed landing gear, like the 75O – was eventually sold to the Chinese Nationalist government who presented it to Claire L. Chennault for personal use. China also received two similar demonstrators, the Hawk 75Q. They also used a number of simplified Hawk 75Ms against the Japanese. The Hawk 75A-5 was built under license in China, but production was later moved to India, and these machines were absorbed into the RAF as the Mohawk IV.

Finland

Curtiss Hawk 75A-3 in Finnish service

After the fall of France, Germany agreed to sell captured Curtiss Hawk fighters to Finland in October 1940. In total, 44 captured aircraft of five subtypes were sold to Finland with three deliveries from 23 June 1941 to 5 January 1944.[8] Not all were from the French stocks, but some were initially sold to Norway and captured in their wooden crates when the Germans conquered the country. The aircraft were given serial codes CU-551 to CU-585.

In Finnish service, the Hawk was well-liked, affectionately called Sussu ("Sweetheart").[9] The Finnish Air Force enjoyed success with the type, credited with 190⅓ kills by 58 pilots, between 16 July 1941 and 27 July 1944, for the loss of 15 of their own.[8] Finnish ace Kyösti Karhila scored 13¼ of his 32 victories in the Hawk, while the top Hawk ace K. Tervo scored 15¾ victories. The Hawks were flown by Lentolaivue 32 throughout their wartime operational service.

The Finnish Hawks were initially armed with either four or six 0.295 in (7.5 mm) machine guns. While sufficient during the early phase of the Continuation War, the increasing speeds and armor of Soviet aircraft soon showed this armament was not powerful enough. From 1942, the State Aircraft Factory replaced the fuselage machine guns with either one or two 0.5 in (12.7 mm) Colt machine guns and installed two or four 0.303 in (7.7 mm) Browning machine guns in each wing. The 0.5 in (12.7 mm) Berezin UB or LKk/42 heavy machine guns were also used.[8] The installation of heavier armament did not change the very good flying characteristics of the fighter, but the armament was much more effective against Soviet planes. The Finnish Hawks were also equipped with Revi 3D or C/12D gunsight.

Surviving Finnish aircraft remained in service with the FAF aviation units HLeLv 13, HLeLv 11 and LeSK until 1948.[8]

France

Curtiss H75C-1

Even before the P-36A entered production, the French Air Force entered negotiations with Curtiss for delivery of 300 aircraft. The negotiating process ended up being very drawn-out because the cost of the Curtiss fighters was double that of the French Morane-Saulnier M.S.406 and Bloch MB.150, and the delivery schedule was deemed too slow. Since the USAAC was unhappy with the rate of domestic deliveries and believed that export aircraft would slow things down even more, it actively opposed the sale. Eventually, it took direct intervention from U.S. President Franklin Roosevelt to give the French test pilot Michel Detroyat a chance to fly the Y1P-36.

Detroyat's enthusiasm, problems with the MB.150, and the pressure of continuing German rearmament finally forced France to purchase 100 aircraft and 173 engines. The first Hawk 75A-1 arrived in France in December 1938 and began entering service in March 1939. After the first few examples, aircraft were delivered in pieces and assembled in France by the Société Nationale de Constructions Aéronautiques du Centre. Officially designated Curtiss H75-C1 (the "Hawk" name was not used in France), the aircraft were powered by Pratt & Whitney R-1830-SC-G engines with 900 hp (671 kW) and had instruments calibrated for the metric system, a seat for French dorsal parachutes, a French-style throttle which operated in reverse from U.S. and British aircraft (full throttle was to the rear rather than to the front) and armament of four 7.5 mm FN-Browning machine guns. The aircraft evolved through several modifications, the most significant being the installation of the Wright R-1820 Cyclone engine. This variant, designated as Curtiss H751-C1, saw little operational use due to its late delivery and reliability problems with the new engine. A total of 416 H75s were delivered to France before the German occupation.[10]

On 8 September 1939, aircraft from Groupe de Chasse II/4 were credited with shooting down two Luftwaffe Messerschmitt Bf 109Es, the first Allied air victory of World War II on the Western front. During 1939–1940, French pilots claimed 230 confirmed and 80 probable victories in H75s against only 29 aircraft lost in aerial combat. Of the 11 French aces of the early part of the war, seven flew H75s. The leading ace of the time was Lieutenant Edmond Marin la Meslée with 15 confirmed and five probable victories in the type. H75-equipped squadrons were evacuated to French North Africa before the Armistice to avoid capture by the Germans. While under the Vichy government, these units clashed with British aircraft over Mers el-Kébir and Dakar. During Operation Torch in North Africa, French H75s fought against U.S. Navy F4F Wildcats, losing 15 aircraft while shooting down seven American planes. From late 1942 on, the Allies started re-equipping the formerly-Vichy-controlled French units and the H75s were replaced by P-40s and P-39s.

Iran

Ten Hawk 75A-9s were delivered to Persia, but were captured by the British while still in crates. These were then used by the RAF in India as Mohawk IVs.

Dutch East Indies

In October 1939, the Dutch East Indies government ordered 24 Hawk 75A-7s, powered by 1,200 hp (895 kW) Cyclones. They had four 0.303 in (7.7 mm) machine guns (two in the nose and one in each wing) and could carry two 100 lb (45 kg) bombs. The fighters were shipped in 1940 (and were almost rerouted to the Netherlands, when Germany invaded) and were used extensively leading up to the Japanese attack. However, by that time the aircraft had flown so many hours, the engines were worn out.

These Dutch Hawks formed 1-VlG IV, or Vliegtuiggroep IV, 1e afdeling (1st Squadron, Airgroup IV) of the ML-KNIL and some with 1-VlG V. They saw action over Malacca, Sumatra, and Java, successfully bombing a railroad and intercepting bombers. They also participated in the extensive dogfights over Surabaya, where US, RAF and ML-KNIL aircraft together fought Japanese bombers and fighters.

Norway

Norway ordered 24 Twin Wasp-powered Hawk 75A-6s, of which 19 were delivered and seven assembled at the time of the German invasion. None of the aircraft were combat-ready. The disassembled aircraft were disabled by a single customs employee who smashed the instruments and cut all the wires he could reach. Norwegian Hawks captured by the Germans were part of the batch sent to Finland. Norway also ordered 36 Cyclone-powered Hawk 75A-8s. Most of this batch (a total of 30) were delivered as advanced trainers to "Little Norway" near Toronto, Ontario, Canada, a Norwegian training base established by the London-based government-in-exile. Still later, they were resold to the U.S. and redesignated the P-36G model.

Peru

In 1943, the U.S. sent 28 Hawks to Peru under the Lend-Lease agreement. These were ex-Norwegian P-36Gs that had served in Canada.

Portugal

Twelve British Cyclone-engine Mohawks ended up in Portugal, after they became obsolete in the RAF. They were assigned to the defence of the Açores. Incidentally, the word açor means "goshawk" in Portuguese language.

Thailand

A few Hawk 75Ns were used by Thailand during the French-Thai War. They also fought at the Battle of Prachuab Khirikhan against Japanese forces during the Japanese Invasion of Thailand.

United States

The first production P-36As were delivered to the 20th Pursuit Group at Barksdale Field in Louisiana in April 1938. The aircraft's service history was marred by numerous teething problems with engine exhaust, skin buckling over landing gear, and weak points in the airframe, severely restricting the performance envelope. By the time these issues were resolved, the P-36 was considered obsolete and was relegated to training units and overseas detachments at Albrook Field in the Canal Zone, Elmendorf Field in Alaska, and Wheeler Field in Hawaii. The only combat by U.S.-operated P-36s took place during the Pearl Harbor attack on 7 December 1941. Five of the 39 P-36A Mohawks at Pearl Harbor were able to take off during the attack and were credited with shooting down two Japanese Mitsubishi A6M2 fighters for the loss of one P-36, the first U.S. aerial victories of World War II.[11]

Variants

Survivors

P-36A (s/n 38-001) is on display at the National Museum of the United States Air Force in Dayton, Ohio. This aircraft was the first P-36 to be delivered to the Air Corps. It was donated by Edward S. Perkins of Anniston, Alabama in April 1959. For many years the aircraft was displayed in the markings of the "desert sand and spinach" camouflage markings of the 27th Pursuit Squadron.[12] The aircraft is now displayed in the markings of the P-36A flown by Lt. Philip Rasmussen during the Japanese attack on Pearl Harbor, 7 December 1941. It is displayed in the Museum's Air Power gallery.[1]

A complete and restored Hawk 75N survives in the Royal Air Force Museum of Thailand. This was the simplified Hawk 75 with non-retractable landing gear and wheel pants. The serial number is unknown, apparently even to the Thais.

A French H75C-1, photograph shown in the France section above, has been restored to flying condition and is owned by The Fighter Collection at Duxford, England. It has been flown and is shown in French camouflage with markings for the same example (n°82) at two different periods in its career on either side.

A Hawk 75A-6, a Finnish aircraft, was being restored in New Zealand but that effort purportedly went bust so new news on the aircraft is needed. One photograph at the Preserved Axis Aircraft website shows a swastika on the tail.

Specifications (P-36A)

Data from Curtiss Fighter Aircraft: A Photographic History 1917-1948[13]

General characteristics

Performance

Armament

See also

Related development

Comparable aircraft

References

Notes
  1. ↑ 1.0 1.1 "Curtiss P-36 Hawk fact sheet." National Museum of the United States Air Force. Retrieved: 7 March 2009.
  2. ↑ 2.0 2.1 Padin 1999, pp. 9, 15.
  3. ↑ 3.0 3.1 March 1995, p.68.
  4. ↑ Shores Air Enthusiast 1983, p.2.
  5. ↑ Shores Air Enthusiast 1983, pp. 2–9.
  6. ↑ Thomas 2003, pp.67-69.
  7. ↑ Thomas 2003, p.69.
  8. ↑ 8.0 8.1 8.2 8.3 Curtiss Hawk 75A Backwoods landing strip - Finnish Air Force aircraft
  9. ↑ Crawford, Bruce. "Hawk 75: Prmise unfulfilled?" curtisshawk75.bravepages.com, 2002. Retrieved: 9 August 2010.
  10. ↑ 10.0 10.1 Persyn 2007
  11. ↑ "Aircraft at Pearl Harbor." www.ww2pacific.com, World War II in the Pacific. Retrieved: 7 March 2009.
  12. ↑ United States Air Force Museum 1975, p. 23.
  13. ↑ Dean and Hagedorn 2007, p. 201.
Bibliography
  • Bowers, Peter M. Curtiss Aircraft, 1907-1947. Annapolis, Maryland: Naval Institute Press, 1979. ISBN 0-87021-152-8.
  • Bowers, Peter M. The Curtiss Hawk 75: Aircraft in Profile No. 80. London: Profile Publications, 1966.
  • Bridgwater, H.C. Combat Colours Number 3: The Curtiss P-36 and P-40 in USAAC/ USAAF Service 1939-1945. Bletchley, Buckinghamshire, UK: Guideline Publications Ltd., 2001. ISBN 0-9539040-5-9.
  • Dean, Francis H. and Dan Hagedorn. Curtiss Fighter Aircraft: A Photographic History 1917-1948. Atglen, PA: Schiffer Publishing, 2007. ISBN 0-7643-2580-9.
  • Fleischer, Seweryn and Jiri Chodil. Curtiss P-36 Hawk, Cz.3 (Monograpfie Lotnicze 63) (in Polish). Gdańsk, Poland: AJ-Press, 2000. ISBN 83-7237-038-9.
  • Green, William. War Planes of the Second World War, Volume Four: Fighters. London: MacDonald & Co. (Publishers) Ltd., 1961 (Sixth impression 1969). ISBN 0-356-01448-7.
  • Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: US Army Air Force Fighters, Part 1. London: Macdonald and Jane's Publishers Ltd., 1977. ISBN 0-356-08218-0.
  • March, Daniel J., ed. British Warplanes of World War II. London: Aerospace Publishing, 1998. ISBN 1-874023-92-1.
  • Padin, Jorge Nuñez, ed. Curtiss Hawk (Serie Fuerza Aérea Argentina: No. 5) (in Spanish). Bahia Blanca, Argentina: Fuerzas Aeronavales, 1999.
  • Persyn, Lionel. Les Curtiss H-75 de l'armée de l'Air (in French). Outreau, France: Éditions Lela Presse, 2007. ISBN 2-914017-46-4.
  • Rys, Marek. Curtiss P-36 Hawk, Cz.1 (Monograpfie Lotnicze 61) (in Polish). Gdańsk, Poland: AJ-Press, 2000. ISBN 83-7237-036-2.
  • Rys, Marek and Seweryn Fleischer. Curtiss P-36 Hawk, Cz.2 (Monograpfie Lotnicze 62) (in Polish). Gdańsk, Poland: AJ-Press, 2000. ISBN 83-7237-037-0.
  • Shores, Chris. "The RAF's Little Indians". Air Enthusiast, Twenty-three, December 1983-March 1984. Bromley, UK:Fine Scroll. ISSN 0143-5450. pp. 1–9.
  • Swanborough, Gordon and Peter M. Bowers. United States Military Aircraft Since 1909. Washington, DC: Smithsonian, 1989. ISBN 0-87474-880-1.
  • Thomas, Andrew. "Indians Over Africa:Curtiss Mohawks in SAAF Service". Air Enthusiast, No. 107, September/October 2003. pp. 66–69.
  • United States Air Force Museum Guidebook. Wright-Patterson AFB, Ohio: Air Force Museum Foundation, 1975.

External links

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