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De Havilland Albatross




DH.91 Albatross ''Fortuna'' alongside the Control Tower at Croydon Airport in 1939]]

The De Havilland DH.91 Albatross was a four-engine British transport aircraft in the 1930s.


DEVELOPMENT

The DH.91 was designed in 1936 by A.E. Hagg to Air Ministry specificiation 36/35 for a trans-Atlantic mail pane. The aircraft was remarkable for the ply-balsa-ply sandwich construction of its fuselage which was later made famous in the De Havilland Mosquito bomber. The first ''Albatross'' flew on May 20, 1937 .


OPERATIONAL HISTORY

The first two DH.91 were briefly used by the Imperial Airways . With the onset of World War II , Royal Air Force considered their range and speed useful for courier flights between Great Britain and Iceland and the two aircraft were pressed into service with the 271 Squadron in September 1940 . Five additional aircraft with reduced capacity and modified cabin windows and flaps were used by Imperial Airways on Bristol - Lisbon and Bristol - Shannon routes.

A total of seven aircraft were built in 1938 - 1939 . The last DH.91 were scrapped in 1943 .


SPECIFICATIONS (DH.91)

  plane Or Copter plane
  jet Or Prop prop
  crew 4
  capacity 22 passengers
  length Main 218 m
  length Alt 71 ft 6 in
  span Main 320 m
  span Alt 105 ft 0 in
  height Main 68 m
  height Alt 22 ft 4 in
  area Main 10015 m&2
  area Alt 1,078 ft&2
  empty Weight Main 9,630 kg
  empty Weight Alt 21,186 lb
  loaded Weight Main 13,381 kg
  loaded Weight Alt 29,438 lb
  engine (prop) De Havilland Gypsy Twelve
  type Of Prop Piston Engine s
  number Of Props 4
  power Main 392 kW
  power Alt 525 hp
  max Speed Main 362 km/h
  max Speed Alt 225 mph
  cruise Speed Main 338 km/h
  cruise Speed Alt 210 mph
  range Main 1,675 km
  range Alt 1,040 miles
  ceiling Main 5,455 m
  ceiling Alt 17,900 ft
  climb Rate Main 35 m/s
  climb Rate Alt 700 ft/min
  loading Main 134 kg/m&2
  loading Alt 27 lb/ft&2
  power/mass Main 012 kW/kg
  power/mass Alt 007 hp/lb




REFERENCES

  • Kopenhagen, W (ed.) (1987) ''Das groβe Flugzeug-Typenbuch.'' Transpress. ISBN 3344001620

  • Jackson, A.J. (1987) ''De Havilland aircraft since 1909.'' Naval Institute Press. ISBN 0870218964



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