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Hanriot HD.2

Floatplane Fighter Aircraft [ 1917 ]

The Hanriot HD.2 was an extension of the earlier HD.1 with floatplanes added to operate from water sources.

Authored By: Staff Writer | Last Edited: 01/26/2019 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

While the French Air Service of World War 1 (1914-1918) ultimately rejected the Hanriot HD.1 in favor of the SPAD S.VII biplane fighter (both detailed elsewhere on this site), the type went on to see operational service under the national flags of others such as the United States, Belgium, and the Kingdom of Italy with total production reaching 1,200 units before the end. Utilizing the same framework of this very capable biplane, France-based Hanriot developed a purpose-built "floatplane fighter" variant under the designation of "HD.2" before the end of 1917 primarily for use by the French Navy (the "Aeronavale").

The aircraft carried a Clerget 9B rotary engine of 130 horsepower and more-or-less maintained the structural form and function of its predecessor. The single-bay, biplane wing arrangement was of unequal span with forward-cranked parallel struts. The mainplane members were situated well-ahead of midships, concentrating the center-of-gravity towards the front of the aircraft. The engine was fitted to a relatively short nose section with the pilot's open-air cockpit directly aft. The fuselage has slab-sides and was generally devoid of obstructions throughout. The tail unit used the same rounded planes as the HD.1 model. The chief physical difference between the two aircraft, of course, was the HD.2's twin floatplane undercarriage which allowed for the requisite water landings and take-offs. A whole new strut network was affixed to the underside of the aircraft for this purpose.

Despite being a floatplane, the aircraft was intended to retain the fighter-like capabilities of the HD.1 so it was well-armed through 2 x 0.303 caliber Vickers Machine Guns in fixed, forward-firing mounts atop the fuselage and synchronized to fire through the spinning propeller blades.

For its evaluation phase, the HD.2 prototypes were tested with different floatplane lengths, with wheeled landing gear arrangements, and - in some cases - different engine installations. Trials were undertaken at Dunkirk with easy access to the water and under controlled circumstances. This work was had throughout the early-to-mid part of 1918 and continued into September. The Armistice to end the war was eventually signed in November of 1918 but the legacy of the HD.2 went on for a time longer.

Basic production forms of the French Navy were designated simply as "HD.2" but there emerged several other experimental forms. The "HD.12" was a one-off model fitting the Le Rhone 9R rotary piston engine of 170 horsepower as well as a wheeled undercarriage for land-based operations. The "HD.27" was another one-off, this time powered by a Hispano-Suiza 8Ac engine of 180 horsepower. The "H.29" saw two built to a standard intended for ship-borne use, these aircraft being powered by a Hispano-Suiza 8Ab series engine.

As completed, the HD.2 had a crew of one. Structurally, it had a running length of 23 feet, a wingspan of 27.10 feet, and a height of 10.1 feet. Empty weight reached 1,100lb with a Maximum Take-Off Weight (MTOW) of 1,540lb possible. Power was from a Clerget 9B series engine of 130 horsepower used to drive a two-bladed wooden propeller at the nose. Maximum reachable speed was 113 miles per hour with a range out to 185 miles and a service ceiling of 15,750 feet.

The United States Navy (USN) contracted for the purchase of ten HD.2 floatplane fighters which, after they had been delivered an operated for a time, were eventually modified locally to a land-based fighting form by the Naval Aircraft Factory (NAF), operating as land-based trainers out of Langley Field under the designation of "HD.2C". At least one was used to experiment with ship-based / ship-launched aircraft which became a design standard of larger warships seen in the Second World War (1939-1945).©MilitaryFactory.com
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Service Year

France national flag graphic

Not in Service.


National flag of France National flag of the United States France; United States
(OPERATORS list includes past, present, and future operators when applicable)
Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.
Maritime / Navy
Land-based or shipborne capability for operating over-water in various maritime-related roles while supported by allied naval surface elements.
Intelligence-Surveillance-Reconnaissance (ISR), Scout
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.

23.0 ft
(7.00 m)
27.9 ft
(8.50 m)
10.2 ft
(3.10 m)
Empty Wgt
1,091 lb
(495 kg)
1,543 lb
(700 kg)
Wgt Diff
+452 lb
(+205 kg)
(Showcased structural values pertain to the base Hanriot HD.2 production variant)
Installed: 1 x Clerget 9B rotary engine developing 130 horsepower and driving a two-bladed propeller unit at the nose.
Max Speed
113 mph
(182 kph | 98 kts)
15,748 ft
(4,800 m | 3 mi)
186 mi
(300 km | 556 nm)
865 ft/min
(264 m/min)

♦ MACH Regime (Sonic)
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030

(Showcased performance specifications pertain to the base Hanriot HD.2 production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)
2 x 0.303 Vickers Machine Guns in fixed, forward-firing mountings synchronized to fire through the spinning propeller blades.

Supported Types

Graphical image of an aircraft medium machine gun

(Not all ordnance types may be represented in the showcase above)
Hardpoint Mountings: 0

HD.2 - Base Series Designation.
HD.2C - USN models with wheeled undercarriage.

General Assessment
Values are derrived from a variety of categories related to the design, overall function, and historical influence of this aircraft in aviation history.
Overall Rating
The overall rating takes into account over 60 individual factors related to this aircraft entry.
Rating is out of a possible 100 points.
Relative Maximum Speed
Hi: 120mph
Lo: 60mph
This entry's maximum listed speed (113mph).

Graph average of 90 miles-per-hour.
City-to-City Ranges
Hanriot HD.2 operational range when compared to distances between major cities (in KM).
Max Altitude Visualization
Small airplane graphic
Design Balance
The three qualities reflected above are altitude, speed, and range.
Aviation Era Span
Pie graph section
Showcasing era cross-over of this aircraft design.
Unit Production (100)
Compared against Ilyushin IL-2 (military) and Cessna 172 (civilian).

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Images Gallery

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Image of the Hanriot HD.2
Image from the Public Domain.


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