HC Deb 30 November 1938 vol 342 cc417-8
61. Mr. Perkins

asked the Secretary of State for Air how many of the machines now used by Imperial Airways, Limited, and British Airways, Limited, respectively, are equipped with any form of quick feathering propeller or propeller brake?

Captain Balfour

Four of the aircraft now used by British Airways and one shortly coming into use have fully feathering airscrews. The remainder have either two pitch or constant speed air-screws. The Empire Flying Boats and Ensign class used by Imperial Airways have two-pitch and the Frobisher class constant speed airscrews, but the company at present have no aircraft with fully feathering airscrews.