Aeronautical Research Council (1945-1979)https://reports.aerade.cranfield.ac.uk/handle/1826.2/42020-12-02T00:24:56Z2020-12-02T00:24:56ZStrip theory method of calculation for airscrews on high-speed aeroplanesLock, C. N. H.Pankhurst, R. C.https://reports.aerade.cranfield.ac.uk/handle/1826.2/41122020-11-15T15:26:45Z1945-10-01T00:00:00ZStrip theory method of calculation for airscrews on high-speed aeroplanes
Lock, C. N. H.; Pankhurst, R. C.
The report describes a simplified 8-point strip theory method of calculating the free-air performance of a propeller up to tip Mach numbers near the velocity of sound. It is based on the assumptions of R. & M. 1674 and 1849 together with the further simplifying assumption that the curve is straight (valid below the stall) and that the curve also is straight (valid for J > 1.0). The report includes tables of parameters which are required in the calculations as functions of J, r, and N for eight standard radii (r, = 0.3, 0.45, 0.6, 0.7, 0.8, 0.9, 0.95, 0.975) for the range of values of J from 1.0 t o 7.0; these are of universal application. In addition, tables of section data for various section shapes are required; these are given for Clark Y sections over a range of thickness in R. & M. 2036; they were derived, by methods described in R. & M. 2020, from overall measurements of thrust and torque on full scale propellers at low values of J in the Royal Aircraft Establishment 24-ft. tunnel and are subject to revision in the light of subsequent experimental research.
1945-10-01T00:00:00ZExploratory investigation of the effects of blowing from the leading edge of a delta wingW. J. G. Trebblehttps://reports.aerade.cranfield.ac.uk/handle/1826.2/40952020-11-15T15:26:51Z1966-01-01T00:00:00ZExploratory investigation of the effects of blowing from the leading edge of a delta wing
W. J. G. Trebble
Low-speed wind-tunnel tests were made to investigate the possibility of increasing the lift of a highly swept wing by ejecting high energy air from the leading edge. The results showed that lift gains were available, but that care should be taken to direct the emergent jet with the minimum possible forward component so that large drag penalties may be avoided.
1966-01-01T00:00:00ZThe heating of air by 'dark' dischargeJ. E. HesselgreavesT. R. F. NonweilerT. R. Foordhttps://reports.aerade.cranfield.ac.uk/handle/1826.2/40962020-11-15T15:26:47Z1966-01-01T00:00:00ZThe heating of air by 'dark' discharge
J. E. Hesselgreaves; T. R. F. Nonweiler; T. R. Foord
Summary. A theoretical and experimental investigation is made of the heating of air by means of a 'dark' or 'Townsend' discharge, the intended application being the heating of the working fluid of a hypersonic intermittent wind tunnel. Results are presented of experiments at atmospheric pressure designed to determine the efficiency of energy conversion and to test the validity of the theoretical assumptions. The theory is used to predict the performance of a small 'pilot model' heater working at 15 atmospheres pressure.
1966-01-01T00:00:00ZSome numerical methods for obtaining harmonic and subharmonic solutions of Duffing's equationM. Newbyhttps://reports.aerade.cranfield.ac.uk/handle/1826.2/40942020-11-15T15:26:47Z1965-01-01T00:00:00ZSome numerical methods for obtaining harmonic and subharmonic solutions of Duffing's equation
M. Newby
Harmonic and subharmonic solutions are determined numerically for the forced oscillations of a system governed by Duffing's equation, and the stability of these oscillations is discussed.
1965-01-01T00:00:00Z