The next example, G-EASC, known as the Viking II, had a greater wing span and a 360 hp Rolls-Royce Eagle VIII motor. The Viking III machine, piloted by Captain Cockerell, won first prize in the amphibian class in Air Ministry competitions held in September and October, 1920.
The Type 54 Viking IV incorporated further refinements and had a wider cabin above a hull one foot wider, an example being G-EBBZ in which Ross Smith and J.M. Bennett (partners in the 1919 England to Australia flight) died on 13 April 1922 just outside the Brooklands racetrack near Weybridge in Surrey. Most of these Mark IV Vikings had a Napier Lion engine.
The last Viking amphibians were built during 1923, but the name was re-used for the twin-piston engined Vickers VC.1 Viking airliner some 22 years later, which saw service as the Valetta with the RAF and other air arms. Some Viking amphibians were built by Canadian Vickers Limited, a subsidiary company in Montreal with no previous plane making experience.
A further development with a redesigned wing structure using the 450 hp Napier Lion would have been the Viking VI (Vickers designation Type 78) but known as the Vulture I. A second with a Rolls-Royce Eagle IX (360 hp, 268 kW) was the Type 95 Vulture II. Both Vultures were used for an unsuccessful around the world attempt in 1924 after the Eagle engine of the Vulture II was replaced with a Lion. With registration G-EBHO, the first set off from Calshot seaplane base on 25 March 1924, the other was shipped as a spare machine to Tokyo. After mechanical difficulties in earlier staged G-EBHO crashed at Akyab where it was replaced by G-EBGO on 25 June. Encountering heavy fog on the Siberian side of the Bering Sea G-ENGO crashed. Vickers salvaged a large proportion.
The Viking Mark VII ("Type 83" in Vickers numbering) was a development of the Vulture, a three-seater open-cockpit fleet-spotter aircraft to Air Ministry specification 46/22 given the service name Vanellus when taken on for evaluation by the RAF against the Supermarine Seagull design.