Airco DH.9

Airco DH.9
Paese	Regno unito
Ruolo	Bomber
Primo volo	luglio 1917
Costruito	4091

Le 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 earlier successful DH.4, with which it shared many components. These were mated to an all-new fuselage and the BHP/Galloway Adriatic engine, which promised increased performance. Anticipating its usefulness, the type was ordered in very large numbers for Britain’s Royal Flying Corps (RFC).

fonte: Airco DH.9 su Wikipedia

de Havilland DH.9 Walk Around
Fotografo	Michael Benolkin
Localizzazione	Inconsapevole
Foto	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.

Property	Typical Value (DH.9 with Puma Engine)
Ruolo	Day Bomber / Reconnaissance Biplane
National Origin	Regno Unito
Produttore	Aircraft Manufacturing Company (Airco)
First Flight	luglio 1917
Equipaggio	2 (Pilot and Observer/Gunner)
Lunghezza	9.27 m (30 ft 5 in)
Apertura alare	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.

Armamento

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.