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Hanriot HD.6

Twin-Seat, Single-Engine Biplane Fighter Prototype

Hanriot HD.6

Twin-Seat, Single-Engine Biplane Fighter Prototype

OVERVIEW
SPECIFICATIONS
ARMAMENT
VARIANTS
HISTORY
MEDIA
OVERVIEW



Developed alongside the HD.5, the Hanriot HD.6 of the World War 1 period had a short-lived flying career in early-mid 1919.
National Flag Graphic
ORIGIN: France
YEAR: 1919
STATUS: Cancelled
MANUFACTURER(S): Hanriot - France
PRODUCTION: 1
OPERATORS: France (cancelled)
SPECIFICATIONS



Unless otherwise noted the presented statistics below pertain to the Hanriot HD.6 model. Common measurements, and their respective conversions, are shown when possible.
CREW: 2
LENGTH: 29.04 feet (8.85 meters)
WIDTH: 44.62 feet (13.6 meters)
HEIGHT: 9.51 feet (2.9 meters)
WEIGHT (EMPTY): 1,786 pounds (810 kilograms)
WEIGHT (MTOW): 2,756 pounds (1,250 kilograms)
ENGINE: 1 x Salmson 18Z Twin-row (2 x Salmson 9Z) water-cooled radial piston engine developing 530 horsepower and driving a two-bladed propeller unit at the nose.
SPEED (MAX): 140 miles-per-hour (225 kilometers-per-hour; 121 knots)
RANGE: 373 miles (600 kilometers; 324 nautical miles)
CEILING: 2,297 feet (700 meters; 0.43 miles)
RATE-OF-CLIMB: 1,000 feet-per-minute (305 meters-per-minute)
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.
2 x 7.7mm Lewis Machine Guns in trainable mounting at rear cockpit.
1 x 7.7mm Lewis Machine Gun on trainable mounting in lower fuselage ventral mounting.
Graphical image of an aircraft medium machine gun
VARIANTS



Series Model Variants
• HD.6 - Base Project Designation; single, flyable prototype completed and flown in 1919.


HISTORY



Detailing the development and operational history of the Hanriot HD.6 Twin-Seat, Single-Engine Biplane Fighter Prototype.  Entry last updated on 1/28/2019. Authored by Staff Writer. Content ©www.MilitaryFactory.com.
Alongside the prototype-minded HD.5 of 1918, Hanriot of France was also developing the equally-experimental HD.6 twin-seat biplane fighter during the last few months of World War 1 (1914-1918). This form borrowed some of the design elements used by the HD.5 but went further in incorporating enough changes to make it wholly unique in the Hanriot lineup. The aircraft was still in its early phases of development when the Armistice of 1918 was signed to end the war - thus it went on to have little impact on the outcome and never entered serial production.

Though taking the HD.5's dual-bay wing design, tandem-seat open-air cockpits, and multi-machine gun approach, the HD.6 was made dimensionally larger with all-new design lines. The engine cowling at the nose was rounded as opposed to the HD.5's squared-off look. The upper wing member of the biplane configuration still resided low against the fuselage and, as in the HD.5, both the forward and trailing edges were cut-out for maximizing pilot and gunner vision. The tail unit utilized a similar single-finned rounded vertical plane and ground-running was possible by a conventional two-wheeled with tailskid "trail-dragger" arrangement.

Proposed armament was slightly dissimilar: 2 x 7.7mm Vickers Machine Guns were mounted in fixed, forward-firing positions over the nose as usual, and the rear cockpit entertained 2 x 7.7mm Lewis Machine Guns on a trainable mounting (T.O.3) as expected, but the floor of the rear gunner's position offered a cut-out in which a third 7.7mm machine gun could fire out onto targets below and behind the aircraft as a new defensive measure. The forward-facing machine gun pair was also synchronized to fire through the spinning propeller blades.

One of the chief design aspects of the HD.6 was its engine, essentially a pairing of Salmson 9Z 9-cylinder radials of 260 horsepower each to produce the singular Salmson 18Z twin-row, water-cooled air-cooled radial unit with a total output rating of 530 horsepower. This drove a typical wooden two-bladed propeller at the nose and was a completely experimental setup by the company to pull every ounce of power out of the fighter therefore producing a high-performance, well-armed aircraft by standards of the period.

However, such an engine arrangement was fraught with issues and delays proved common to the HD.6's development to the point that flight-testing of the design was not had until the Spring of 1919 - the war had ended back in November of 1918 and the demand for new fighters among the major players of the war was at an all-time low. Additionally, it was found that the twin engine pairing, despite the increase horsepower, added little to performance. As such, development of the HD.6 only ran into the summer of 1919 and it was given up for good shortly thereafter - the sole, flyable prototype being the only concrete work had on the program.

As built, the aircraft had an overall length of 29 feet, a wingspan of 44.6 feet, and a height of 9.5 feet. Empty weight reached 1,790lb against a Maximum Take-Off Weight (MTOW) of 2,755lb being reached. The HD.6's service ceiling was listed at 23,000 feet and range was out to 375 miles.

Design of this interesting biplane is attributed to Emile Dupont, as was the HD.5 detailed elsewhere on this site.




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 Rating
Hi: 150mph
Lo: 75mph
    This entry's maximum listed speed (140mph).

    Graph average of 112.5 miles-per-hour.
City-to-City Ranges
NYC
 
  LDN
LDN
 
  PAR
PAR
 
  BER
BER
 
  MSK
MSK
 
  TKY
TKY
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Graph showcases the Hanriot HD.6'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 Comparison
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.


Altitude Visualization
Small airplane graphic
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.