Wind-tunnel tests on a half-span model delta wing, fitted with an all-moving tip control surface, are described. The model, which is flexible, has a leading-edge sweepback of 45 deg; and the control surface, which is rigid, ...

The report is in two parts, following a general introduction. Part I describes wind-tunnel tests on (a) a series of models of annular entries, with and without propeller, in the 5-ft tunnel ; (b) a set of large circular ...

A brief investigation was made in R.A.E. wind tunnels into instability of a body towed by a helicopter. This was undertaken after an incident in which a divergent oscillation led to cable failure in flight. Stability ...

During recent investigations into the self-excited oscillations ill yaw, experienced on Meteor aircraft, the lateral stability derivative, nr, was measured in flight, and found to differ considerably during initial experiments ...

This paper discusses the basic principles employed in techniques for the measurement of oscillatory derivatives in wind tunnels, and gives some account of the associated instrumentation. The suitability of the various ...

Measurements of the thrust, torque and flapping angle for a 12-ft diameter rotor over a range of blade angle, shaft inclination and tip-speed ratio have been made to give information on the validity of the standard rotor ...

Summary.---This report describes the two-dimensional wind-tunnel \\'tests carried out in the National Physical Laboratory 13 x 9 ft wind tunnel on a 31.5 per cent thick suction aerofoil, GLAS-II, which has a single slot ...