Hyde, D.2017-07-042017-07-041963-04http://dspace.lib.cranfield.ac.uk/handle/1826/12148A transducer-horn arrangement has been suggested as a suitable noise source to be installed in the Lancaster aircraft so that the Handley-Page suction fin could be subjected to large acoustical disturbances. The object of this note is to clarify this proposal with a view to recommending actions to be taken.enReport