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Huntley, E. (author)
The optimal (minimum distance) transition is studied for jet-lift VTOL aircraft in which the range of engine tilt avai1able is sufficient to allow approach angles up to 20º. The optimal use of incidence, thrust vector angle and thrust to control the transition is considered. It is shown that provided control programmes are formulated as...
report 1970
document
Pike, J. (author)
Conical flow fields in which details of the flow are known, are used to produce lifting surfaces which are conical about their 'noses' and concave, nearly flat or convex across their span. At the appropriate Mach number (i.e. 3.53 or 4 for this Report), the flow about the surfaces is known, and it is found that surfaces intermediate in shape...
report 1970
document
Broadbent, E.G. (author)
report 1970
document
Cannell, J.N. (author)
The pitch computer of the take-off director system developed jointly by Elliott Brothers Ltd. and the Royal Aircraft Establishment has been experimentally coupled to the standard Mk.10 automatic pilot installed in a Vulcan aircraft. Successful flight tests, including automatic overshoots and takeoffs, are described and some indications of...
report 1970
document
Pinsker, W.J.G. (author), Jones, J.G. (author)
It is normally assumed that the direction in which a body of turbulent air is traversed in flight is not significant in relation to the aircraft, and that this is also true in non-rectilinear flight. In this paper it is demonstrated that, contrary to the results obtained using this general assumption, aircraft can experience losses or gains in...
report 1970
document
McPherson, A. (author), Nicholls, J.M. (author)
In a number of flights in the stratosphere over mountainous terrain in the western U.S.A., much valuable data was collected. Flights were planned on the basis of tropospheric lee wave forecasts and were usually made along wind at heights from the tropopause to about 50000 ft over California and Nevada. Mountain waves, deduced from an analysis of...
report 1970
document
Broadbent, E.G. (author)
A method of calculation is presented for determining the inviscid flow field with heat addition, that surrounds the recirculating bubble, in an axisymmetrie experiment with burning behind a blunt base. As in previous work, the streamlines are chosen and the mode of heat addition determined, although in the present paper it is the streamtube area...
report 1970
document
Daniels, R. (author), Jones, J.G. (author)
A discrete step model of low-altitude atmospheric turbulence is described. It has been derived from a commonly used continuous Gaussian process model by considering transitions occurring over discrete intervals. The consequent elimination of fine structure enables additional statistical properties to be calculated. A primary objective is to...
report 1970
document
Edwards, P.R. (author)
In this paper an investigation is described of residual stresses associated with plastic deformation at a stress concentration in an aluminium alloy specimen. Local stresses were determined, by an indirect method, under a variety of sequences of loads which included peaks high enough to cause local yielding. Sequences at bath zero and a positive...
report 1970
document
Broadbent, E.G. (author), Townend, L.H. (author)
Some centred flows in two dimensions with heat addition are derived. The solutions take the form of analytica1 expressions for the physical variables as functions of the cylindrical polar coordinate, ø , alone, and the corresponding modes of heat addition are found as part of the solution. A case of particular interest is that of isothermal heat...
report 1969
document
Edwards, P.R. (author)
In this Report factors affecting the accuracy of Miner's Rule are discussed. An investigation is also described of thecumulative damage behaviour of DTD, 5014 aluminium alloy lug specimens using random loading. It is concluded that the deviations from Miner's Rule observed in the investigation can be ascribed mainly to the act ion of residual...
report 1969
document
Wilcock, T. (author)
A piloted flight simulator study of the low speed handling of the BAC 221 slender-wing research aircraft was performed for validation of the simulation of slender-wing supersonic transport aircraft. The lateral representation of the aircraft was satisfactory, and lateral control prob1ems experienced on the real aircraft at high angles of...
report 1969
document
Jones, J.G. (author)
This Report extends earlier work employing the concept of a self-similar random process in relation to the problem of predicting aircraft gust loads. A discrete gust model of the atmosphere is presented which allows a description of the statistical properties of intense gusts as a function of gust length. Empirical functions describing the...
report 1969
document
Stagg, A.M. (author)
The fatigue test results, for elements and sections from the structures of aircraft, obtained by a number of experiment ers are analysed in terms of the scatter present in the lives to fatigue failure. Data for structures made of any light alloy material and tested under any form of loading have been included in an attempt to increase the...
report 1969
document
Hazlewood, L.J. (author), Huntley, E. (author)
In previous publications the so-called serial/matrix technique has been developed for the response analysis of systems defined by time-invariant ordinary differential equations. One paper describes how an explicit formulation for the output function may be easily obtained when the input function is deterministic. A second gives the output...
report 1969
document
Brookman, A.K. (author)
Design and constructional details are given for a sensor suitable for fine guidance of sun pointing space vehicles. Factors affecting the accuracy and stability of the sensor are discussed and optimum values for certain critical parameters suggested for Skylark and satellite applications. Bias error measurement methods are described and it is...
report 1969
document
Stagg, A.M. (author)
The scatter in the fatigue lives of identical simple laboratory specimens, which have been tested under variable amplitude sinusoidal loading, is estimated, using a log-normal distribution of fatigue lives as a basis, from tne fatigue test results of a number of experimenters. These estimates of the scatter are analyzed with a view to studying...
report 1969
document
Stagg, A.M. (author)
A brief review of same of the investigations that have been conducted in thepast into the form of the distribution of constant amplitude fatigue test results is presented and is followed by an analysis of a large amount of constant amplitude data for 2024 and 7075 materials collected from a variety of sources. This analysis, in terms of a log...
report 1969
document
Peel, C.J. (author), Forsyth, P.J.E. (author)
The fracture toughness of fully aged aluminium-zinc-magnesium-coppermanganese alloy, of DTD 5024 composition, is reported for the cast state, after a 3:1 upset and again after a further 3:2 upset at right angles to the first pressing. It was found that forging increases the fracture toughness in the longitudinal direction, whilst reducing it in...
report 1969
document
Pearson, S. (author)
report 1968
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