Five-tube yawmeter traverses immediately up and downstream of the fan reveal the flow maldistributions due to forward speed. These are removed by a deep duct or an inlet cascade, which turn the air into the axial direction. ...

Results are given of wind-tunnel tests of a square wing with a lifting fan of 1/44th the wing area located at 0.354 chord. Forces and pressure distributions were measured both on the bare wing and with plain and split ...

Stalling tests were made on the 8 per cent thick section NPL 434, which has been specially designed for nose-slot suction. At the higher suction quantities, the maximum lift of the aerofoil was considerably greater than ...