Donnet-Denhaut flying boat

DD-2, DD-8, DD-9, DD-10

Role  | Patrol flying boat
Manufacturer  | Donnet-Denhaut
First flight  | 1915
Primary users  | French Navy
United States Navy, Portuguese Navy
Number built | ca. 1,085

The Donnet-Denhaut flying boat was a maritime patrol and anti-submarine warfare aircraft produced in France during the First World War. Known at the time simply as "Donnet-Denhaut" or "DD" flying boats, the DD-2, DD-8, DD-9, and DD-10 designations were applied retrospectively to denote the various changes in configuration made during their service life.[1]

## Contents

* 1 Design and development
* 2 Operational history
* 3 Operators
* 4 Specifications (DD-8)
* 5 See also
* 6 Notes
* 7 References

## Design and development

Developed in response to a French Navy requirement, these were biplane flying boats of conventional configuration with two-bay unstaggered wings, and a Salmson R9 160 hp radial engine,[2] mounted pusher-fashion on struts in the interplane gap. The French Navy ordered some 90 aircraft in this original configuration (later dubbed DD-2), and in 1917, requested Donnet-Denhaut to redesign the aircraft to take advantage of the new Hispano-Suiza 8 engine. So equipped, the Navy ordered another 365 machines. In order to take full advantage of the more powerful engine, Donnet-Denhaut increased the wingspan by adding a third bay to the wing cellule and used the extra lift to incorporate a place for a second gunner, bringing the total crew to three. This version (later, the DD-8) became the most produced, with perhaps 500 aircraft built. The DD-8 was also known as the Donnet-Denhaut 300-hp.

Further developments added a second machine gun to each gunner's station (the DD-9) and twin engines mounted in a push-pull configuration (the DD-10). Following the war, a few military surplus DDs were remanufactured as the Donnet HB.3 and operated commercially for a time.

## Operational history

Apart from French Navy service, DD flying boats were operated by the United States Navy in Europe, flying from Île-Tudy and Dunkirk to protect convoys from submarines. Some 50 aircraft of this type were purchased, and the first attack (against U-108; unsuccessful) took place on 23 April 1918.[3]

## Operators

France

* French Navy

Portugal

* Portuguese Naval Aviation

United States

* United States Navy

## Specifications (DD-8)

General characteristics

* Crew: Three
* Length: 10.75 m (35 ft 5 in)
* Wingspan: 16.80 m (55 ft 1 in)
* Height: 3.00 m (9 ft 10 in)
* Wing area: 53.0 m2 (570 sq ft)
* Empty weight: 950 kg (2,100 lb)
* Gross weight: 1,800 kg (3,970 lb)
* Powerplant: 1 × Hispano-Suiza 8b , 149 kW (200 hp)

Performance

* Maximum speed: 130 km/h (80 mph, 70 kn)
* Range: 520 km (320 mi, 280 nmi)
* Endurance: 4 hours
* Rate of climb: 2.5 m/s (500 ft/min)

Armament

* 2 × .303 trainable Lewis guns in open cockpits at bow
* 2 × 35 kg (70 lb) bombs

## See also

Aircraft of comparable role, configuration and era

* FBA Type H
* Lohner L

Related lists

* List of maritime patrol aircraft
* List of flying boats and floatplanes
* List of World War I Entente aircraft

## Notes

1. ↑ "Donnet-Denhaut DD.2 - DD.10". http://flyingmachines.ru/Site2/Crafts/Craft25727.htm.
2. ↑ "Donnet-Denhaut DD.2 - DD.10" (in Russian). http://flyingmachines.ru/Site2/Crafts/Craft25727.htm. Retrieved 6 November 2019.
3. ↑ "Donnet-Denhaut Flying Boat". http://www.worldwar1.com/dbc/donnetd.htm.

## References

* Le Roy, Thierry (October 2000). "Courrier des Lecteurs" (in fr). Avions: Toute l'Aéronautique et son histoire (91): 4. ISSN 1243-8650.
* Lopes, Mário Canongia (October 2000). "Courrier des Lecteurs" (in fr). Avions: Toute l'Aéronautique et son histoire (91): 4–5. ISSN 1243-8650.
* Morareau, Lucien (July 2000). "Les hydravions Donnet-Denhaut de l'Aviation Maritime Française" (in fr). Avions: Toute l'Aéronautique et son histoire (88): 28–37. ISSN 1243-8650.
* Morareau, Lucien (August 2000). "Les hydravions Donnet-Denhaut de l'Aviation Maritime Française" (in fr). Avions: Toute l'Aéronautique et son histoire (89): 14–26. ISSN 1243-8650.
* Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. pp. 326.
* Jane's All the World's Aircraft 1919. London: Sampson Low. pp. 228.
* A.Soltan, J.Davilla. French Aircraft of the First World War.
* P.Bowers, G.Swanborough. United States Navy Aircraft Since 1911. Putnam.
* Hirschauer, Louis; Dollfus, Charles, eds (1920). L'Année Aéronautique: 1919-1920. Paris: Dunod. p. 31. https://gallica.bnf.fr/ark:/12148/bpt6k6553380s/f43.item.

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