The Vickers Wellington is a British twin-engined, long-range medium bomber. It was designed during the mid-1930s at Brooklands in Weybridge, Surrey. Led by Vickers-Armstrongs' chief designer Rex Pierson; a key feature of the aircraft is its geodetic airframe fuselage structure, which was principally designed by Barnes Wallis. Development had been started in response to Air Ministry Specification B.9/32, issued in the middle of 1932, for a bomber for the Royal Air Force.
Vickers Wellington
Wellingtons under construction, showing the geodetic airframe
RNZAF Wellington Mark I aircraft with the original turrets; anticipating war, the New Zealand government loaned these aircraft and their aircrews to the RAF in August 1939
Wartime poster using a cutaway of Wellington to illustrate how scrap and salvage was recycled for use in the production of war materiel.
A medium bomber is a military bomber aircraft designed to operate with medium-sized bombloads over medium range distances; the name serves to distinguish this type from larger heavy bombers and smaller light bombers. Mediums generally carried about two tons of bombs, compared to light bombers that carried one ton, and heavies that carried four or more.
The USAAF B-25B Mitchell, a medium bomber.
Polish PZL.37 Łoś, a medium bomber.
The Japanese Mitsubishi G4M "Betty", a medium bomber.