The basis for designing parachutes of R. & M. 862 did not appear to be correct for parachutes with cords over the canopy. Moreover, the presence of these cords was essential in a practical design for heavy duty purposes ...
The Report presents a theory of the aerodynamic interference between a helicopter rotor blade and a fuselage or wing. A two-dimensional analysis is made to which a correction factor is applied to convert the two-dimensional ...
A theory of blockage constraint on the flow past a bluff body in a closed wind tunnel is developed, using an approximate relation describing the momentum balance in the flow outside the wake, and two empirical auxiliary relations.
The simple model used by Brown and Michael to represent the flow past a slender delta wing with leading edge separation, is extended to treat wings which have pointed apexes, curved leading edges and straight, unswept ...
The,torsional vibrations of a four-boom cylinder of doubiy symmetrical rectangular cross-section are considered and the differential equation of motion is derived on the assumption that the ribs maintain the section shape ...
The post-buckling behaviour of a circular plate is investigated for two conditions--heating over the centre and heating at the edge. In the former case the plate buckles into the form of a saucer; in the latter into a ...
A continuous solution is derived for the stress distribution in a simple wing surface represented by a uniformly reinforced stri p bounded by equal constant area edge members, when the sections in the airstream experience ...
Thermodynamic charts giving enthalpy, entropy, temperature, pressure and specific volume, have been constructed for the products of combustion of a hydrocarbon fuel (85 per cent C, 15 per cent H by weight) with nitric acid ...
Thermodynamic charts showing enthalpy, entropy and specific volume for a range of pressures and temperatures have been constructed for the decomposition products of 80, 85 and 90 per cent w/w hydrogen peroxide (H.T.P.) for ...
The essential features of a practical method of determining gas turbine performance are that it shall be suitable for accurate routine calculation, and that it is capable of simple modification in order to deal with a range ...
Summary. The design, development and performance of a three component strain gauge balance system designed for testing thin wings in the Imperial College gun tunnel is described. The balance was machined out of high strength ...
The boundary-layer equations are derived for a very general co-ordinate system, and various theorems hitherto only proved in more restrictive systems are extended to this general system. The particular case of streamlines ...
Measurements in turbulent boundary layers have shown large transverse variations of skin friction. It appears that these are associated with three-dimensional disturbances originating in the transition region. The disturbances ...
Time marching methods are in principle the most flexible means of calculating blade-to-blade flows in turbomachinery since the same method can be used for subsonic, transonic and supersonic flows with automatic inclusion ...
Summary. This report extends earlier work by describing the time-vector method for lateral stability investigations. Using thls method, each equation of motion of an aircraft can be represented by a closed vector polygon, ...
The effect of a gap in an isolated aerofoil spanning a tunnel has been investigated both theoretically and experimentally. Two flow models have been suggested; one is valid for moderately large gap/chord ratios and the ...
The report presents the results of theoretical calculations of torsional flutter of unstalled cascade blades. It is shown that the position of the torsional axis is of great importance, the best position being near the ...
An attempt is made to explain the observed torsional oscillations of an airscrew by means of the 'wake' theory. It is shown that the aerodynamic torsional damping becomes negative at certain blade angles and frequencies; ...
The torsional rigidity of solid cylinders of double-wedge section is considered theoretically. Minimum energy methods are used to determine close upper and lower limits to the rigidity. The results are presented in graphical form.