Airco DH.9

Airco DH.9
Pays	Royaume-uni
Rôle	Bombardier
Premier vol	Juillet 1917
Construit	4091

Lla Airco DH.9 (from de Havilland 9) – also known after 1920 as the de Havilland DH.9 – was a British single-engined biplane bomber developed and deployed during the First World War. The DH.9 was a development of Airco’S a déjà réussi DH.4, avec lequel il partageait de nombreux composants. Ceux-ci ont été accouplés à un tout nouveau fuselage et au moteur BHP / Galloway Adriatic, qui promettait des performances accrues. Anticipant son utilité, le type a été commandé en très grand nombre pour la Grande-Bretagne’s Royal Flying Corps (RFC).

Source: Airco DH.9 sur Wikipedia

de Havilland DH.9 Walk Around
Photographe	Michael Benolkin
Localisation	Inconnu
Photos	20

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General Characteristics and Role

The Airco de Havilland DH.9 was a British two-seat biplane bomber developed from the highly successful DH.4 during World War I. Designed by Geoffrey de Havilland, it was intended to replace the DH.4 by featuring an all-new fuselage and a promised powerful new engine. However, the chosen Siddeley Puma engine proved unreliable and underpowered, severely limiting the DH.9’s performance, particularly at high altitudes. Despite its poor combat performance on the Western Front, thousands were built, and it saw extensive post-war service, including early commercial air transport roles (DH.9C variant) and as a colonial policing aircraft, which was later rectified by its successor, the greatly improved DH.9A (or « Nine-Ack ») fitted with the American Liberty L-12 engine. [Image of the Royal Aircraft Factory R.E.8 biplane in flight]

Property	Typical Value (DH.9 with Puma Engine)
Rôle	Day Bomber / Reconnaissance Biplane
National Origin	Royaume-Uni
Fabricant	Aircraft Manufacturing Company (Airco)
First Flight	Juillet 1917
Crew	2 (Pilot and Observer/Gunner)
Length	9.27 m (30 ft 5 in)
Envergure	12.92 m (42 ft 5 in)
Empty Weight	Approx. 1,012 kg (2,231 lb)
Maximum Takeoff Weight	Approx. 1,723 kg (3,800 lb)

Powerplant and Performance

Engine: One Armstrong Siddeley Puma (BHP-derived) six-cylinder, liquid-cooled inline engine.
Power Output: 230 hp (170 kW). (The engine failed to reach its intended 300 hp output).
Maximum Speed: Approx. 180 km/h (112 mph) at 3,000 m (10,000 ft).
Service Ceiling: Approx. 4,724 m (15,500 ft).
Endurance: Approx. 4.5 hours.
Performance Issue: The engine’s lack of power and unreliability meant the DH.9 often had inferior performance to the aircraft it was intended to replace, the DH.4.

Armement

Pilot Armament: 1 x fixed, forward-firing .303 in (7.7 mm) Vickers machine gun (synchronized).
Observer Armament: 1 or 2 x flexible-mounted .303 in (7.7 mm) Lewis machine gun(s) on a Scarff ring in the rear cockpit.
Bomb Load: Up to 209 kg (460 lb) of bombs.
- Note: The fuselage redesign moved the pilot aft, creating a more suitable internal bomb bay nearer the center of gravity.
Key Distinction: The successor DH.9A was a greatly improved aircraft, featuring a more reliable 400 hp Liberty L-12 engine and larger wings, resolving the key deficiencies of the original DH.9.