 The Bristol Aeroplane Company was considered to be well placed to compete in this field but, in the event, they found themselves lagging behind other competing companies based in Germany, Italy, the United States, and at home in the United Kingdom.Between 1929 and 1934, there were a number of altitude records established by rival aircraft, 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; of these aircraft, all had been powered by Bristol-produced or Bristol-designed engines.Between 1928 and 1938, the altitude record was broken 10 times, once using a Jupiter engine and five times using a Pegasus engine; this was considered to be a hugely significant achievement for Bristol engines.