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WORLD WAR 1
X-PLANE


Hanriot HD.5


Twin-Seat Biplane Fighter Prototype


The Hanriot HD.5 was just one flyable prototype form tested during 1918 - development was ended with the end of World War 1.
Authored By: Staff Writer | Edited: 1/28/2019
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Specifications


Year: 1918
Status: Cancelled
Manufacturer(s): Hanriot - France
Production: 1
Capabilities: Fighter; Reconnaissance (RECCE); X-Plane;
Crew: 2
Length: 26.15 ft (7.97 m)
Width: 34.12 ft (10.4 m)
Height: 9.02 ft (2.75 m)
Weight (Empty): 1,764 lb (800 kg)
Weight (MTOW): 2,756 lb (1,250 kg)
Power: 1 x Hispano-Suiza 8Fb 8-cylinder, liquid-cooled inline piston engine developing 300 horsepower and driving a two-bladed wooden propeller at the nose.
Speed: 134 mph (215 kph; 116 kts)
Ceiling: 20,341 feet (6,200 m; 3.85 miles)
Range: 311 miles (500 km; 270 nm)
Operators: France (cancelled)
During the World War 1 (1914-1918) period, Hanriot of France was able to deliver several capable fighting biplanes by way of several successful designs beginning with the HD.1 (detailed elsewhere on this site). The follow-up HD.2 became its floatplane derivative and the line was bettered through the addition of the HD.3 in the weeks leading up to the end of the war (November 1918). To push the line even further, in early 1918 the company was already engaged in a new biplane fighter to entice prospective buyers towards the end of the war - this becoming the "HD.5".

The HD.5 continued the form and function established by the HD.3 including its two-seat, tandem crew arrangement with the pilot seated at front and the gunner at the rear. The biplane configuration was traditional for the period though now left unstaggered as opposed to the staggered pair seen on the HD.3. The members used parallel strut supports and a wider span, the latter necessitating two bays to support the length. The members were positioned well-ahead of midships and, rather uniquely, both the leading and trailing edges of the upper wing were cut-out to clear spaces for both the pilot and gunner - this also allowed the upper wing to be seated closer to the fuselage while improving views for both crewmembers. Another change from the earlier HD.3 came in the form of the Hispano-Suiza 8Fb 8-cylinder, water-cooled inline engine of 300 horsepower to drive a wooden propeller blade at the nose. The tail unit was conventional mounting a single, rounded large-area rudder and low-set horizontal planes. For ground-running, a typical twin-wheeled/tailskid undercarriage was used.

Like other Hanriot fighters, the HD.5 would be well-armed: 2 x 7.7mm Vickers Machine Guns in fixed, forward mountings over the nose and managed by the pilot with 1 or 2 x 7.7mm Lewis Machine Guns set atop a trainable mounting in the rear cockpit for the gunner/observer. The forward-facing guns were synchronized to fire through the spinning propeller blades.

The HD.5 prototype was tested as soon as Spring of 1918 with the war's end still in doubt. However, the sole test vehicle was all that was had on the project but its design was used to influence the development of the HD.7, a navalized fighter version appearing in the post-war period.

The HD.6 was developed in parallel with the HD.5 and emerged as an altogether different biplane fighter development detailed elsewhere on this site.






Graphical image of an aircraft medium machine gun

Armament



PROPOSED:
2 x 7.7mm Vickers Machine Guns in fixed, forward-firing mountings over the nose and synchronized to fire through the spinning propeller blades.
1 OR 2 x 7.7mm Lewis Machine Guns on trainable mounting in rear cockpit.

Variants / Models



• HD.5 - Base Series Designation; single flyable prototype completed.
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