The original PV-6 prototype, registered G-ACBR (and also known as the Houston-Wallace) along with Westland PV-3 G-ACAZ, was part of the Houston Everest Expedition, named after Lucy, Lady Houston the patron, an attempt to fly over Mount Everest.
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It was used for the first flight over Mount Everest in the Westland Wallace, and in 1938 set the world's long-distance record in Vickers Wellesleys.
Between 1929 and 1934, there were a number of altitude records established by rival machines including a Junkers W.34, a Vickers Vespa and a Caproni Ca.113 biplane, as well as the first flight over Everest by a pair of Westland Wallaces in 1933; all these aircraft used Bristol or Bristol-designed engines.
Examples of aeroplanes with Townend rings were the Douglas O-38, Vickers Wellesley, the Westland Wallace and the Gloster Gauntlet.
In November 1932, the PV-3 was chosen, together with the Westland PV-6 (the prototype of the Westland Wallace) for the Houston Mount Everest Flying Expedition to fly over and photograph Mount Everest.