De Havilland DH61 Giant Moth in Western Australia
The Giant Moth could also be fitted with the 450 hp Bristol Jupiter engine which was already being used in the DH66 Hercules fleet on WAA's Perth-Adelaide Air Mail service. This fitted in very nicely, helped minimise the carriage of spares and simplified engine maintenance and service procedures with an ability to interchange engines between various aircraft. Initially the more powerful 500 hp geared Jupiter XI was supposed to be available, but these were all needed for military contracts and so the 450 hp direct drive, ungeared Jupiter VI was supplied.
Ten Giant Moths were built by De Havilland at Stag Lane. The type was designed by the famous Arthur Hagg in response to an Australian requirement for a DH50J replacement. The pilot sat in an open cockpit, aft of the passenger cabin. The cockpit was offset to the port side so the pilot could see what he was doing. Passenger accommodation could be increased to 8 if baggage was reduced to 600 pounds. However, with the long sectors of the North West run large fuel loads would have taken part of the normal payload.
Test flying was done by Hubert Broad in January 1928 before shipment to Australia of the first Giant Moth, which had been registered in England G-EBTL. The aircraft arrived and was erected by De Havilland at Essendon. It was then delivered in March 1928 as G-AUTL Old Gold to Horrie Miller of Macrobertson Miller Aviation Co (MMA) at Parafield, South Australia. The aircraft was re-registered as VH-UTL in 1930.
In April 1931, Major Norman Brearley was able to buy the DH61 VH-UTL Old Gold and it would continue on in service with West Australian Airways until mid-1935.
DH61 Giant Moth VH-UTL with West Australian Airways' DH50
Early in 1932 G-AAAN was sold to West Australian Airways for the North West Air Mail Service, becoming VH-UTL. Together these two DH61 Giant Moths were operated in Western Australia until 1935.
DH61 Giant Moth VH-UQJ operated in Western Australia for four years with West Australian Airways on the North West Air Mail route.
WAA's North West route ran as follows: Perth-Geraldton-Carnarvon-Onslow-Roebourne-Port Hedland-Broome-Derby-Wyndham. The two Giant Moths were probably used on the Perth to Carnarvon sector of the North West route, which would have had the heaviest passenger traffic.
West Australian Airways lost the North West Air Mail service contract in 1934 to MMA. Then, in the same year, Qantas was awarded the Empire Air Mail contract to fly air mail from Brisbane through Darwin to Singapore. This led to a dramatic reduction to loads on West Australian Airways' Perth-Adelaide route, since the air mail bound for England had previously left Australia on the Mail Steamer from Fremantle to Karachi.
This dramatic revenue reduction, in conjunction with the economic depression, forced Brearley to sell some of the WAA aircraft assets. As a result the Giant Moths were disposed of in early 1935.
and VH-UTL were both sold to Guinea Airways for service in New Guinea.
1934, the age of the large passenger airliner with only a single engine had passed.
References: De Havilland Aircraft Since 1909, A J Jackson.
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