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Hanriot HD.7

Single-Seat, Single-Engine Biplane Fighter Prototype

Hanriot HD.7

Single-Seat, Single-Engine Biplane Fighter Prototype

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
IMAGES
Overview



The HD.7 was another late-war biplane fighter entry by the Hanriot concern of France - it lost out to the Nieuport 29.
National Flag Graphic
ORIGIN: France
YEAR: 1918
STATUS: Cancelled
MANUFACTURER(S): Hanriot - France
PRODUCTION: 1
OPERATORS: France (cancelled)
National flag of France
FRA
Technical Specifications



Unless otherwise noted the presented statistics below pertain to the Hanriot HD.7 model. Common measurements, and their respective conversions, are shown when possible.
CREW: 1
POWER: 1 x Hispano-Suiza 8Fb 8-cylinder water-cooled engine developing 300 horsepower and driving a two-bladed propeller unit at the nose.
ADVERTISEMENTS
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Armament



PROPOSED:
2 x 7.7mm Vickers Machine Guns in fixed, forward-facing mountings over the nose and synchronized to fire through the spinning propeller blades.
Graphical image of an aircraft medium machine gun
Variants / Models



• HD.7 - Base Project Designation; single, flyable prototype completed.


History



Detailing the development and operational history of the Hanriot HD.7 Single-Seat, Single-Engine Biplane Fighter Prototype.  Entry last updated on 1/29/2019. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
The relative successes of the earlier Hanriot series of biplane fighters spurred the company to invest in evolved forms centered on the base design direction. One such entry into the series that began with the HD.1 of 1916 was the "HD.7", a direct development from the HD.3 that appeared during mid-1917. This prototype-only aircraft was drawn up to compete as a possible successor to the in-service SPAD S.XIII, the classic French fighter which appeared in 1917 and went on to see production reach 8,472 units before the end.

Unlike earlier twin-seat Hanriot fighter attempts, the HD.7 reverted back to the HD.1's single-seat layout and continued some of the design lines established through the HD.3. The engine-of-choice became the Hispano-Suiza 8Fb 8-cylinder, water-cooled engine outputting 300 horsepower fitted to the nose and driving a two-bladed wooden propeller. A typical over-under biplane wing arrangement was used that was staggered , single-bayed, and with parallel strut works. The mainplanes were situated well-ahead of midships. A section of the upper wing's trailing edge was cut-out to afford the pilot better upward vision. the pilot sat in an open-air cockpit aft and under the upper wing member. The fuselage, with its slab sides, tapered towards the rear to which a single-finned, rounded rudder was affixed with low-set horizontal planes - a design form not unlike that seen in the HD.3.

To fulfill its combat-minded role, the aircraft was proposed with a pairing of 7.7mm Vickers Machine Guns arranged over the nose and set to fire through the spinning propeller blades via synchronization. Beyond this, the aircraft was limited in any other role besides air-to-air combat with the occasional ground strafe.

The prototype was made ready for a first-flight in mid-1918 with the end of the war just months away (the Armistice would be signed as soon as November 1918). The primary competition for the Hanriot product became the Nieuport 29 (detailed elsewhere on this site), another single-seat biplane design powered by the same engine and armed in the same fashion. While the Hanriot HD.7 proved a sound design, offering capable handling, performance, and firepower, it was ultimately edged out by the impressive Nieuport 29 prototype - which went on to net adoption as well as a serial production contract (1,571 units were completed). Official service introduction of this mount was had in 1922 and the type, rather amazingly, flew into the 1930s.

As for the Hanriot HD.7, the sole prototype was all that was had from the venture and development on the new fighter was ultimately abandoned as the company continued to push other biplanes for the near-future.

As completed, the HD.7 had a length of 23.7 feet, a wingspan of 32 feet, and a height of 9.9 feet. Empty weight reached 2,715lb with a Maximum Take-Off Weight (MTOW) of 4,200lb. The Hispano-Suiza 8Fb engine, rated at 300 horsepower, provided the aircraft with a maximum speed of 135 miles-per-hour which, by World War 1 standards - was impressive. Range was out to 560 miles.

In comparison, the winning Nieuport 29 could reach speeds of 146 miles-per-hour, fly out to 360 miles, and attain an altitude of up to 27,885 feet.




Media







Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

Image of collection of graph types

Relative Maximum Speed
Hi: 150mph
Lo: 75mph
This entry's maximum listed speed (135mph).

Graph average of 112.5 miles-per-hour.
City-to-City Ranges
NYC
 
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  TKY
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  NYC
Graph showcases the Hanriot HD.7's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production (1)
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
1
1

  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


Supported Roles
A2A
Interception
UAV
Ground Attack
CAS
Training
ASW
Anti-Ship
AEW
MEDEVAC
EW
Maritime/Navy
SAR
Aerial Tanker
Utility/Transport
VIP
Passenger
Business
Recon
SPECOPS
X-Plane/Development
A2A=Air-to-Air; UAV=Unmanned; CAS=Close Support; ASW=Anti-Submarine; AEW=Airborne Early Warning; MEDEVAC=Medical Evac; EW=Electronic Warfare; SAR=Search-Rescue
Commitments / Honors
Military lapel ribbon for Operation Allied Force
Military lapel ribbon for the Arab-Israeli War
Military lapel ribbon for the Battle of Britain
Military lapel ribbon for the Battle of Midway
Military lapel ribbon for the Berlin Airlift
Military lapel ribbon for the Chaco War
Military lapel ribbon for the Cold War
Military lapel ribbon for the Cuban Missile Crisis
Military lapel ribbon for pioneering aircraft
Military lapel ribbon for the Falklands War
Military lapel ribbon for the French-Indochina War
Military lapel ribbon for the Golden Age of Flight
Military lapel ribbon for the 1991 Gulf War
Military lapel ribbon for the Indo-Pak Wars
Military lapel ribbon for the Iran-Iraq War
Military lapel ribbon for the Korean War
Military lapel ribbon for the 1982 Lebanon War
Military lapel ribbon for the Malayan Emergency
Military lapel ribbon representing modern aircraft
Military lapel ribbon for the attack on Pearl Harbor
Military lapel ribbon for the Six Day War
Military lapel ribbon for the Soviet-Afghan War
Military lapel ribbon for the Spanish Civil War
Military lapel ribbon for the Suez Crisis
Military lapel ribbon for the Vietnam War
Military lapel ribbon for Warsaw Pact of the Cold War-era
Military lapel ribbon for the WASP (WW2)
Military lapel ribbon for the World War 1
Military lapel ribbon for the World War 2
Military lapel ribbon for the Yom Kippur War
Military lapel ribbon for experimental x-plane aircraft
* Ribbons not necessarily indicative of actual historical campaign ribbons. Ribbons are clickable to their respective campaigns/operations.


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