A floatplane has slender pontoons mounted under the fuselage. Two floats are common, but other configurations are possible. Only the "floats" of a floatplane normally come into contact with water. The fuselage remains above water. Some small land aircraft can be modified to become float planes and in general floatplanes are small aircraft. Floatplanes are limited by their ability to handle wave heights typically greater than 12 inches (0.31 m). These float pontoons add to the empty weight of the airplane, and to the drag coefficient, resulting in reduced payload capacity, slower rate-of-climb and slower cruise speed.

French Floatplanes 1916

Hanriot HD-2

Hanriot HD-2, a U.S. Navy version on floats. 1916

The Hanriot HD.2 was a fighter aircraft produced in France during the First World War. The design was based on that of the HD.1, but the HD.2 was a purpose-built floatplane. It made use of enlarged tail surfaces and shorter wingspans with greater area. Like its predecessor, though, it was a conventional single-bay biplane with staggered wings of unequal span. The prototype had a twin pontoon undercarriage, with a small third pontoon under the tail. The third pontoon was later discarded on production machines, though.

The HD.2 was developed specifically as an interceptor to defend flying boat bases, but soon was used as an escort fighter to protect French reconnaissance flying boats. The United States Navy also bought 10 examples with wheeled undercarriages, designated HD.2C.
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Hanriot HD.2
  • Type: Biplane fighter aircraft
  • Manufacturer: Hanriot
  • Designed by: Pierre Dupont
  • Entered Service: June 1916
  • Variants:
  • HD.2: - floatplane fighter with Clerget 9B engine
    • HD.2C - HD.2: 10 built for USN, plus 2 converted from HD.2 by French Navy
  • H.29 - HD.2: 2 built
  • Wingspan: 25 ft 6 in (8.70 m)
  • Wing Area: 193.7 ft²; (18 m²)
  • Length: 19 ft 2 in (5.85 m)
  • Height: 9 ft 7.5 in (2.94 m)
  • Empty Weight: 895 lb (407 kg)
  • Loaded Weight: 1,331 lb (605 kg)
  • Max Takeoff Weight: 1,437 lb (652 kg)
  • Powerplant: 1× Le Rhône 9J rotary engine, 110 hp (82 kW)
  • Maximum Speed: 114 mph (184 km/h)
  • Range: 342 mi (550 km)
  • Service ceiling: 21,000 ft (6,400 m)
  • Rate of Climb: 5.1 mins to 7,600 ft (2,000 m); 11 mins to 9,840 ft (3,000 m)
  • Crew: one, pilot
  • Armament: 1 × or 2 × Vickers machine gun (7.7 mm)

References

  1. Hanriot HD.2. (2010, February 13). In Wikipedia, The Free Encyclopedia. Retrieved 06:59, July 31, 2010, from http://en.wikipedia.org/w/index.php?title=Hanriot_HD.2&oldid=343852844
  2. Taylor, Michael J. H. (1989). "Jane's Encyclopedia of Aviation". London: Studio Editions. pp. 469.
  3. "World Aircraft Information Files". London: Bright Star Publishing. pp. File 896 Sheet 11.

French Floatplanes 1917

SPAD S.XIV

SPAD S-XIV 1917
SPAD S.XIV - 1917

The SPAD S.XIV was a single-seat French biplane seaplane fighter aircraft built by Société Pour L'Aviation et ses Dérivés (SPAD) and flown by the French Navy during World War I. The SPAD XIV was a development of the SPAD XII. It was powered by a 149 kW (200hp) Hispano-Suiza 8 Bc engine. The S.XIV was similarly armed with the 37 mm cannon developed by SAMC for which 12 shots were carried. The cannon fired through the propellor shaft, necessitating the use of a geared Hispano-Suiza aviation engine to mount the gun. The SPAD XIV also carried a single 0.303 inch (7.7 mm) Vickers machine gun mounted on the starboard side of the nose. Fourty were constructed and flew in the French Navy during 1918.

SPAD S.XIV
  • Type: Seaplane Fighter
  • Country: France
  • Manufacturer: Société Pour L'Aviation et ses Dérivés
  • First Flight: November 15, 1917
  • Entered Service: 1918
  • Number built: 40
  • Developed From: SPAD S.XII
  • Length: 24 ft 5 in (7.40 m)
  • Wingspan: 32 ft 1¾ in (9.80 m)
  • Height: 13 ft 1 in (4 m)
  • Wing Area: 85.958 ft² (26.2 m²)
  • Empty Weight: 1,698 lb (770 kg)
  • Loaded Weight: 2 337 lb (1060 kg)
  • Powerplant: 1 × Hispano-Suiza 8 Bc, 200 hp (149 kW)
  • Maximum Speed: 127 mph (205 km/h)
  • Crew: 1
  • Armament:
    • 1 × Vickers 7.7 mm synchronized machine gun
    • 1 × 37 mm canon

References

  1. SPAD S.XIV. (2010, March 14). In Wikipedia, The Free Encyclopedia. Retrieved 06:24, August 25, 2010, from http://en.wikipedia.org/w/index.php?title=SPAD_S.XIV&oldid=349722825
  2. http://www.aviafrance.com/aviafrance1.php?ID=144&ID_CONSTRUCTEUR=1231
  3. Taylor, Michael J H. "Jane's Encyclopedia of Aviation". pg. 835. Portland House, 1989. ISBN 0-517-69186-8