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Loire-Nieuport LN.401

December 17, 2023

The Loire-Nieuport LN.40 aircraft were a family of French naval dive-bombers for the Aeronavale in the late 1930s, which saw service during World War II.

LN.401
A Loire-Nieuport LN.40
Role dive bomber
Manufacturer SNCAO
First flight 6 July 1938
Introduction 1939
Retired 1940
Primary user French Navy
Produced 1938–1942
Number built 68

Design and development edit

Between 1932 and 1936, Nieuport-Delage had been developing a two-seat dive bomber, the Nieuport Ni.140, for the Aéronautique Navale, the aviation arm of the French Navy. It was renamed Loire-Nieuport LN.140 after the Nieuport company was absorbed into Loire-Nieuport, in 1933. The first of two prototypes, the LN.140-01, was flown on 12 March 1935, but had crashed in July during a forced landing, not being repaired. Flight testing continued with the second prototype, the LN.140-02, until development was abandoned after, that too, crashed in July 1936.

Development efforts were then concentrated on the LN.40 project which benefited from experience with the LN.140, but was a new, and aerodynamically more refined design, replacing the fixed and spatted undercarriage of the LN.140 with rearward retracting main gear legs, and dispensing with the second crewman. In the second half of 1937 an order was received for a prototype, followed by orders for seven production aircraft for the aircraft carrier Béarn and three more for operational evaluation by the air force. The French Air Force had expressed interest in a land-based derivative of the LN.40, designated the LN.41. Initial plans were for 184 to equip six dive bomber squadrons with 18 aircraft each, plus reserves.

The prototype made its first flight on 6 July 1938, the second followed in January 1939, and the third in May. Four of the pre-series LN.40 dive bombers were delivered in July, and it passed its carrier trials aboard the aircraft carrier Béarn. Nevertheless, the flight tests found that the dive brakes were ineffective, which led to their being removed in favour of using the extended landing gear doors as air brakes. The LN.40 also could not carry out diving attacks with full fuel tanks. The aircraft was too slow for the air force which requested the development of a faster dive bomber, which would become the Loire-Nieuport LN.42.[1][2]

In July 1939, Loire-Nieuport had received orders for 36 LN.401 production dive bombers for the Navy, and 36 LN.411 aircraft for the Army. The LN.411 was almost identical to the LN.401, except for the deletion of the arrestor hook, the wing folding mechanism and the emergency floatation devices. The first LN.411s were delivered in September which coincided with an order from the air force for 270 more but in October they were refused, and the LN.411s were sent to the Navy.

Loire-Nieuport also attempted to develop a faster version, by substituting an 860 hp (640 kW) Hispano-Suiza 12Y-31 for the 690 hp (510 kW) Hispano-Suiza 12Xcrs engine of the LN.401. This LN.402 made its first flight on 18 November 1939. Further development of the LN.402 was prevented by the French defeat in May 1940 and the following armistice.

The final development was the LN.42 dispensed with the inverted gull wing and elevator endplates and used the much more powerful 1,100 hp (820 kW) Hispano-Suiza 12Y-51 engine but was too late for the Second World War, making only a few short hops before France fell during the 1940 invasion of France when it was hidden from the Germans for the duration of the war. Flight trials resumed on 24 August 1945 and ran until 1947, however no interest was forthcoming of the now obsolete type and only one example was built.[2]

Operational history edit

Two escadrilles of the Aéronautique Navale, designated as AB2 and AB4, converted to the LN.401/411 between late 1939 and early 1940. AB2 received its first LN.401 dive bombers in November 1939, while AB4 received the LN.411 dive bombers rejected by the Air Force from February 1940 onwards. The dive bombers rejected by the Air Force were a welcome reinforcement to the Navy, as the production of the LN.401 was very slow.[3]

Both used the type in combat during the Battle of France in ground attacks against German motorized columns and troop concentrations. Losses were heavy. One attack on 19 May resulted in the loss of 10 out of 20 dive bombers committed, while seven of the survivors were sufficiently damaged to be no longer airworthy. The production rate of the LN.401 and LN.411 was insufficient to replace losses, and in about a month of fighting the two squadrons lost two-thirds of their strength.[4]

After the armistice with Germany, Loire-Nieuport dive bombers were retired from service and the two escadrilles were re-equipped with the Glenn-Martin 167-F level bomber.

Variants edit

Nieuport Ni.140
Original Nieuport design first flown on 12 March 1935. Renamed Loire-Nieuport LN.140 after the merger of Loire and Nieuport. Both prototypes lost by July 1936, when efforts were transferred to the improved LN.40.
LN.40
Pre-production aircraft. Seven built.
LN.41
Proposed land based LN.40
LN.401
Production single-seat carrier-based dive bomber. 15 built.
LN.411
Land-based 401, with naval equipment removed; 45 built.
LN.402
One example fitted with a 860 hp (640 kW) Hispano-Suiza 12Y-31 engine.
LN.42
1940 development which dispensed with the inverted gull wing. Sole example used a 1,100 hp (820 kW) Hispano-Suiza 12Y-51 engine.[2]

Operators edit

  France

Specifications (LN.401) edit

 
Loire Nieuport LN-40 3-view drawing from L'Aerophile August 1943

Data from War Planes of the Second World War: Volume Eight Bombers and Reconnaissance Aircraft[5]

General characteristics

  • Crew: 1
  • Length: 9.75 m (32 ft 0 in)
  • Wingspan: 14 m (45 ft 11 in)
  • Height: 3.5 m (11 ft 6 in)
  • Wing area: 24.75 m2 (266.4 sq ft)
  • Empty weight: 2,243 kg (4,945 lb)
  • Gross weight: 2,835 kg (6,250 lb)
  • Powerplant: 1 × Hispano-Suiza 12Xcrs V-12 liquid-cooled piston engine, 510 kW (690 hp) at 4,000 m (13,000 ft)

Performance

  • Maximum speed: 380 km/h (240 mph, 210 kn) at 4,000 m (13,000 ft)
  • Cruise speed: 299 km/h (186 mph, 161 kn) (economical cruise)
  • Range: 1,200 km (750 mi, 650 nmi)
  • Service ceiling: 9,500 m (31,200 ft)

Armament

  • Guns: 1 × Hispano-Suiza HS.404 20 mm (0.787 in) cannon and 2 × 7.5 mm (0.295 in) Darne machine guns
  • Bombs: 1 × 225 kg (496 lb) or 165 kg (364 lb) bomb, or 10 × 10 kg (22 lb) or 15 kg (33 lb) bombs

See also edit

Related development

Aircraft of comparable role, configuration, and era

Related lists

References edit

Notes edit

  1. ^ ROSENTHAL, Léonard; MARCHAND, Alain; BORGET. Michel; BENICHOU, Michel (1997). Nieuport : 1909-1950 (in French). [Clichy]: Larivière. ISBN 9782907051118.
  2. ^ a b c "Loire-Nieuport LN 40 LN 401 LN 411 LN 42". www.histaviation.com. Retrieved 27 February 2015.
  3. ^ Taylor, John W. R.; Alexander, Jean (1969). Combat aircraft of the world. London: Ebury P.; Michael Joseph. pp. 105–106. ISBN 0-71810-564-8.
  4. ^ Smith, Peter C. (1962). Dive bomber : an illustrated history. Annapolis, MD: Naval Institute Press. ISBN 978-0-87021-930-6.
  5. ^ Green, William (1967). War Planes of the Second World War; Volume Eight; Bombers and Reconnaissance Aircraft. London: Macdonald. p. 47.

Bibliography edit

  • Borget, Michel (August 1985). "Le Nieuport 140 ou la saga d'un bombardier piquer" [The Nieuport 140 or the Saga of a Dive Bomber]. Le Fana de l'Aviation (in French) (189): 38–45. ISSN 0757-4169.
  • Cortet, Pierre (November 1997). "Courrier Lecteurs" [Readers Mail]. Avions: Toute l'aéronautique et son histoire (in French) (56): 2. ISSN 1243-8650.
  • Mombeek, Eric (May 2001). "Les trésors de Cazaux" [The Treasures of Cazaux]. Avions: Toute l'Aéronautique et son histoire (in French) (98): 44–47. ISSN 1243-8650.
  • Morareau, Lucien (2002). Les aéronefs de l'aviation maritime : 1910-1942 (2. éd. ed.). Paris: ARDHAN. ISBN 2-913344-04-6.

External links edit

 
Wikimedia Commons has media related to Loire-Nieuport LN.40.
  • histaviation.com

December 17, 2023
loire, nieuport, loire, nieuport, aircraft, were, family, french, naval, dive, bombers, aeronavale, late, 1930s, which, service, during, world, 401a, loire, nieuport, 40role, dive, bombermanufacturer, sncaofirst, flight, july, 1938introduction, 1939retired, 19. The Loire Nieuport LN 40 aircraft were a family of French naval dive bombers for the Aeronavale in the late 1930s which saw service during World War II LN 401A Loire Nieuport LN 40Role dive bomberManufacturer SNCAOFirst flight 6 July 1938Introduction 1939Retired 1940Primary user French NavyProduced 1938 1942Number built 68 Contents 1 Design and development 2 Operational history 3 Variants 4 Operators 5 Specifications LN 401 6 See also 7 References 7 1 Notes 7 2 Bibliography 8 External linksDesign and development editBetween 1932 and 1936 Nieuport Delage had been developing a two seat dive bomber the Nieuport Ni 140 for the Aeronautique Navale the aviation arm of the French Navy It was renamed Loire Nieuport LN 140 after the Nieuport company was absorbed into Loire Nieuport in 1933 The first of two prototypes the LN 140 01 was flown on 12 March 1935 but had crashed in July during a forced landing not being repaired Flight testing continued with the second prototype the LN 140 02 until development was abandoned after that too crashed in July 1936 Development efforts were then concentrated on the LN 40 project which benefited from experience with the LN 140 but was a new and aerodynamically more refined design replacing the fixed and spatted undercarriage of the LN 140 with rearward retracting main gear legs and dispensing with the second crewman In the second half of 1937 an order was received for a prototype followed by orders for seven production aircraft for the aircraft carrier Bearn and three more for operational evaluation by the air force The French Air Force had expressed interest in a land based derivative of the LN 40 designated the LN 41 Initial plans were for 184 to equip six dive bomber squadrons with 18 aircraft each plus reserves The prototype made its first flight on 6 July 1938 the second followed in January 1939 and the third in May Four of the pre series LN 40 dive bombers were delivered in July and it passed its carrier trials aboard the aircraft carrier Bearn Nevertheless the flight tests found that the dive brakes were ineffective which led to their being removed in favour of using the extended landing gear doors as air brakes The LN 40 also could not carry out diving attacks with full fuel tanks The aircraft was too slow for the air force which requested the development of a faster dive bomber which would become the Loire Nieuport LN 42 1 2 In July 1939 Loire Nieuport had received orders for 36 LN 401 production dive bombers for the Navy and 36 LN 411 aircraft for the Army The LN 411 was almost identical to the LN 401 except for the deletion of the arrestor hook the wing folding mechanism and the emergency floatation devices The first LN 411s were delivered in September which coincided with an order from the air force for 270 more but in October they were refused and the LN 411s were sent to the Navy Loire Nieuport also attempted to develop a faster version by substituting an 860 hp 640 kW Hispano Suiza 12Y 31 for the 690 hp 510 kW Hispano Suiza 12Xcrs engine of the LN 401 This LN 402 made its first flight on 18 November 1939 Further development of the LN 402 was prevented by the French defeat in May 1940 and the following armistice The final development was the LN 42 dispensed with the inverted gull wing and elevator endplates and used the much more powerful 1 100 hp 820 kW Hispano Suiza 12Y 51 engine but was too late for the Second World War making only a few short hops before France fell during the 1940 invasion of France when it was hidden from the Germans for the duration of the war Flight trials resumed on 24 August 1945 and ran until 1947 however no interest was forthcoming of the now obsolete type and only one example was built 2 Operational history editTwo escadrilles of the Aeronautique Navale designated as AB2 and AB4 converted to the LN 401 411 between late 1939 and early 1940 AB2 received its first LN 401 dive bombers in November 1939 while AB4 received the LN 411 dive bombers rejected by the Air Force from February 1940 onwards The dive bombers rejected by the Air Force were a welcome reinforcement to the Navy as the production of the LN 401 was very slow 3 Both used the type in combat during the Battle of France in ground attacks against German motorized columns and troop concentrations Losses were heavy One attack on 19 May resulted in the loss of 10 out of 20 dive bombers committed while seven of the survivors were sufficiently damaged to be no longer airworthy The production rate of the LN 401 and LN 411 was insufficient to replace losses and in about a month of fighting the two squadrons lost two thirds of their strength 4 After the armistice with Germany Loire Nieuport dive bombers were retired from service and the two escadrilles were re equipped with the Glenn Martin 167 F level bomber Variants editNieuport Ni 140 Original Nieuport design first flown on 12 March 1935 Renamed Loire Nieuport LN 140 after the merger of Loire and Nieuport Both prototypes lost by July 1936 when efforts were transferred to the improved LN 40 LN 40 Pre production aircraft Seven built LN 41 Proposed land based LN 40 LN 401 Production single seat carrier based dive bomber 15 built LN 411 Land based 401 with naval equipment removed 45 built LN 402 One example fitted with a 860 hp 640 kW Hispano Suiza 12Y 31 engine LN 42 1940 development which dispensed with the inverted gull wing Sole example used a 1 100 hp 820 kW Hispano Suiza 12Y 51 engine 2 Operators edit nbsp FranceFrench Navy French Air Force Vichy French Air ForceSpecifications LN 401 edit nbsp Loire Nieuport LN 40 3 view drawing from L Aerophile August 1943Data from War Planes of the Second World War Volume Eight Bombers and Reconnaissance Aircraft 5 General characteristicsCrew 1 Length 9 75 m 32 ft 0 in Wingspan 14 m 45 ft 11 in Height 3 5 m 11 ft 6 in Wing area 24 75 m2 266 4 sq ft Empty weight 2 243 kg 4 945 lb Gross weight 2 835 kg 6 250 lb Powerplant 1 Hispano Suiza 12Xcrs V 12 liquid cooled piston engine 510 kW 690 hp at 4 000 m 13 000 ft Performance Maximum speed 380 km h 240 mph 210 kn at 4 000 m 13 000 ft Cruise speed 299 km h 186 mph 161 kn economical cruise Range 1 200 km 750 mi 650 nmi Service ceiling 9 500 m 31 200 ft Armament Guns 1 Hispano Suiza HS 404 20 mm 0 787 in cannon and 2 7 5 mm 0 295 in Darne machine guns Bombs 1 225 kg 496 lb or 165 kg 364 lb bomb or 10 10 kg 22 lb or 15 kg 33 lb bombsSee also editRelated development Loire Nieuport LN 161Aircraft of comparable role configuration and era Aichi D3A Blackburn Skua Breda Ba 201 Junkers Ju 87 Northrop BT Naval Aircraft Factory SBN Vought SB2U VindicatorRelated lists List of bomber aircraft List of aircraft of World War II List of aircraft of the French Air Force during World War IIReferences editNotes edit ROSENTHAL Leonard MARCHAND Alain BORGET Michel BENICHOU Michel 1997 Nieuport 1909 1950 in French Clichy Lariviere ISBN 9782907051118 a b c Loire Nieuport LN 40 LN 401 LN 411 LN 42 www histaviation com Retrieved 27 February 2015 Taylor John W R Alexander Jean 1969 Combat aircraft of the world London Ebury P Michael Joseph pp 105 106 ISBN 0 71810 564 8 Smith Peter C 1962 Dive bomber an illustrated history Annapolis MD Naval Institute Press ISBN 978 0 87021 930 6 Green William 1967 War Planes of the Second World War Volume Eight Bombers and Reconnaissance Aircraft London Macdonald p 47 Bibliography edit Borget Michel August 1985 Le Nieuport 140 ou la saga d un bombardier piquer The Nieuport 140 or the Saga of a Dive Bomber Le Fana de l Aviation in French 189 38 45 ISSN 0757 4169 Cortet Pierre November 1997 Courrier Lecteurs Readers Mail Avions Toute l aeronautique et son histoire in French 56 2 ISSN 1243 8650 Mombeek Eric May 2001 Les tresors de Cazaux The Treasures of Cazaux Avions Toute l Aeronautique et son histoire in French 98 44 47 ISSN 1243 8650 Morareau Lucien 2002 Les aeronefs de l aviation maritime 1910 1942 2 ed ed Paris ARDHAN ISBN 2 913344 04 6 External links edit nbsp Wikimedia Commons has media related to Loire Nieuport LN 40 histaviation com Retrieved from https en wikipedia org w index php title Loire Nieuport LN 401 amp oldid 1169126052, wikipedia, wiki, book, books, library,

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