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Encyclopedia > Airco DH.4
Airco DH.4
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Airco DH.4

The Airco DH.4 was a British two-seat biplane day-bomber of the First World War. It was a design by Geoffrey de Havilland (hence "DH") for Airco, and was the first British aircraft to be designed for a specific combat role of day-bomber. It first flew in August 1916 and entered service in early 1917. Image File history File links DeHavilland_DH-4_040130-f-9999b-007. ... Image File history File links DeHavilland_DH-4_040130-f-9999b-007. ... Hs123 biplane. ... Ypres, 1917, in the vicinity of the Battle of Passchendaele. ... Sir Geoffrey de Havilland (July 27, 1882 - May 21, 1965) was one of Englands aviation pioneers. ... George Holt Thomas established the Aircraft Manufacturing Company (Airco) at The Hyde in Hendon, north London, England during 1912. ... This is a list of aviation-related events from 1916: Events January January 12 - German aces Max Immelmann and Oswald Boelcke, with 8 kills, are the first pilots awarded with Pour le Mérite (the Blue Max) January 29 - the second and last Zeppelin raid on Paris inflicts 54 casualties. ...


The DH 4 was tried out with a wide variety of engines before the 375 hp Rolls-Royce Eagle engine was selected as the power plant. Armament and ordinance for the aircraft consisted of one 0.303 Vickers machine gun for the pilot and one 0.303 in. Lewis machine gun on a Scarff ring mounting for the Observer. Two 230 lb. bombs or four 112 lb. bombs could be carried. The design entered service on 6 March 1917 with No. 55 Squadron in France. The Rolls-Royce Eagle V12 was a 12 cylinder 60 degree V12 aero engine of 20 Liters capacity. ...

Contents

Service

The DH-4 proved a huge success and was considered the best single-engined bomber of the First World War. With its reliability and impressive performance -even when fully loaded with bombs- the variant proved highly popular with its crews. The Airco DH-4 was easy to fly, could fly at over 100 mph and had a ceiling of 17-23,000 feet. German fighters were ineffective in reaching these heights and thus the DH-4 often did not require a fighter escort on missions. One design drawback was the distance between pilot and observer, caused by the fuel tank placed between the pilot and observer, making communication difficult. This mid-placed fuel tank meant that if hit by enemy fire both crew were in danger of being burnt to death. This was rectified in the otherwise inferior De Havilland DH.9. Three DH.9A in formation. ...


Production

Production was by Airco, F.W. Berwick and Co, Glendower Aircraft Company, Palladium Autocars, Vulcan Motor and Engineering, and the Westland Aircraft Works in the UK. SABCA of Belgium made fifteen. In the United States, the Boeing Airplane Corporation, Dayton-Wright Aeroplane Company, The Fisher Body Corporation, and the Standard Aircraft Corporation. George Holt Thomas established the Aircraft Manufacturing Company (Airco) at The Hyde in Hendon, north London, England during 1912. ... The Boeing Company (NYSE: BA, TYO: 7661 ) is an aerospace and defense corporation headquartered in Chicago, Illinois. ...


At the time of entry into the war the American Air Service lacked any aircraft suitable for service. They therefore procured various aircraft from the British and French, one being the DH 4. As the DH.4a it was manufactured mostly by Dayton-Wright and Fisher Body for service with the United States from 1918. The powerplant was a Liberty L-12 of 400 hp and it was fitted with two .30 inch Marlin machine guns in the nose and two .30 inch Lewis machine guns in the rear and could carry 322 pounds of bombs. The larger engine gave a better ceiling (19,600 feet) and top speed (128 mph). General characteristics Layout V-12 Cooling water Cylinders 12 Valve type Displacement 27 litres Rotation rate 1700 rpm Power 400 hp Power (300 kW Weight 383kg The Liberty L-12 was a 27 litre water-cooled 45 degree V-12 aircraft engine of 400 horsepower (300 kW). ... A Marlin Firearms Company manufactures Marlin Rifles. ... The Lewis Gun was a pre-WWI era British machine gun that continued to see service all the way through WWII. It is visually distinctive because of the wide tubular cooling shroud around the barrel, and the top mounted drum magazines. ...


Specifications (DH.4)

General characteristics

  • Crew: 2
  • Length: 30 feet 6 inches (9.30 metres)
  • Wingspan: 43 feet 6 inches (13.26 m)
  • Height: 10 feet 4 inches (6.20 m)
  • Loaded weight: 3,557 lb (1,613 kg)
  • Powerplant:Armstrong Siddeley Puma or Rolls-Royce Eagle VII , ()

Performance

Armament

Forward firing Vickers machine gun
Rear Lewis gun on scarff ring.
460 lb (209 kg) bombs. The distance AB is the wing span of this Aer Lingus Airbus A320. ... The Armstrong Siddeley Puma was an aero engine developed towards the end of the first world war. ... for the 1940s engine, see Rolls-Royce Eagle 22 The Rolls-Royce Eagle V12 was an aero engine developed during the First World War by Rolls-Royce that was used to power a number of military aircraft. ... VNO of an aircraft is the V speed which refers to the velocity of normal operation. ... The maximal total range is the distance an aircraft can fly between takeoff and landing as limited by its fuel capacity. ... In aeronautics, the service ceiling is the maximum density altitude where the best rate of climb airspeed will produce a 100 feet per minute climb(twin engine) and 50 feet(single engine) at maximum weight while in a clean configuration with maximum continuous power. ... This page is a candidate to be moved to Wiktionary. ... The Vickers machine gun or Vickers gun is a name primarily used to refer to the water-cooled . ... The Lewis Gun was a pre-WWI era American design of machine gun most widely used by the British Empire and Imperial armies that continued to see service all the way through to WWII, it first saw combat with the Belgian Army in WWI. It is visually distinctive because of... A Scarff ring was a machine gun mount used on aircraft in the First World War. ...

Civil operators

  • Aircraft Transport and Travel Company
  • Handley Page Transport
  • Imperial Airways
  • Instone Air Line Ltd
  • SNETA

The Imperial Airways Empire Terminal, Victoria, London. ...

Military operators


 
 

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