Vickers 72 Vanguard / 103 Vanguard / 170 Vanguard
A one-off civil variant designated Type 72 Vanguard, accommodating 23 passengers and powered by two Napier Lion engines (later 485kW Rolls-Royce Condor III engines as the Type 103 Vanguard) entered service with Imperial Airways in May 1928. It was destroyed in an accident in late 1928 when being tested after modification of the tail unit as the Type 170 Vanguard.
Type 103 Vanguard
Engines: 2 x Rolls-Royce Condor III, 485 kW