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Aeronautical Research Committee Reports & Memoranda: Recent submissions

Now showing items 21-40 of 71

Experiments on rigid airship R.29

Pannell, J. R.; Bell, A. H. (H. M. Stationery Office, 1920)

Airship R.29. was the last ship of the 27 Class and it was considered desirable that a record of her performance should be obtained before she was placed out of commission. Arrangements were, therefore, made for the ...
Aerodynamic forces on wings in simple harmonic motion

W. Prichard Jones (H. M. Stationery Office, 1945)

A theory for the calculation of the aerodynamic forces acting on wings of finite span and any plan form is developed, and from it an approximate method which reduces the amount of numerical work is derived. Satisfactory ...
The prevention of flutter of spring tabs

Collar, A. R. (H. M. Stationery Office, 1943)

The present report gives a correlation of the results of earlier researches into the prevention of flutter of spring tabs. The restrictions on the way in which tab mass-balance must be applied, which are given in the earlier ...
Application of thin aerofoil theory to the design of double flap controls of small chord

H. H. B. M. Thomas; M. Lofts (H. M. Stationery Office, 1944)

Recent experimental investigations on small-chord controls in two-dimensional flow suggest that such controls are more efficient than wide-chord controls. The experiments also suggest that a further gain is obtained if the ...
The experimental determination of the boundary layer and wake characteristics of a piercy 12/40 aerofoil, with particular reference to the trailing edge region

J. H. Preston; N. E. Sweeting; D. K. Cox (H. M. Stationery Office, 1945)

To carry out on a Piercy 12/40 aerofoil an experimental investigation similar to that which was made using a Simple Joukowski aerofoil, and which is described in R. & M. 1998. The aim being to provide data relating to ...
Frequency "admittance" curves for coupled engine crankshaft (torsional) and contra-revolving propeller (flexural) vibrations

J. Morris (H. M. Stationery Office, 1943)

In this report the "admittance" method, for dealing with coupled vibrations of engine crankshaft propeller systems, is adapted to cover the case of contra-revolving propellers. The treatment is quite general in that the ...
Experiments on the measurements of transition position by chemical methods

J. H. Preston; N. E. Sweeting; F. H. Burstall (H. M. Stationery Office, 1945)

The smoke filament technique for detecting transition points is limited to speeds below 180 ft./sec, for orthodox atmospheric tunnels with good lighting and viewing conditions. Also many tunnels are of the enclosed pressure ...
Wind tunnel experiments on a model autogyro at small angles of incidence

Lock, C. N. H.; Townend, H. C. H. (H. M. Stationery Office, 1928)

A wooden scale model, 6 feet in diameter, of the original 4-bladed rotating wing unit of the Cierva Autogyro, has been tested in the Duplex tunnel at blade angles of 0°, 1°, 1.8°, 2.30° and 3°. It has also been tested as ...
Tunnel interference at compressibility speeds using the flexible walls of the rectangular high-speed tunnel

Lock, C. N. H.; J. A. Beavan (H. M. Stationery Office, 1944)

The results of various measurements made in the National Physical Laboratory Rectangular High-speed Tunnel using the flexible walls are compared with theory in order to throw further light on the problem of tunnel interference ...
On the static thrust of contra-rotating airscrews

Collar, A. R. (H. M. Stationery Office, 1941)

Under static conditions or at low rates of advance, the blades of a single airscrew are often stalled, except perhaps for the outer sections. At first sight, it would appear that the same conditions must apply to the blades ...
On the periodic effects experienced by the blades of a contra-rotating airscrew pair

Collar, A. R. (H. M. Stationery Office, 1941)

The present paper discusses the effects on the performance of a contra-rotating airscrew pair of the oscillatory nature of the flow round the blades. The blade sections at a representative radius are developed into two ...
The effect of differing thickness distributions on a propellor's efficiency

A. B. Haines (H. M. Stationery Office, 1944)

Calculations of the efficiency of propellors having five different thickness distributions (effects of other variants having been eliminated) have been made for forward speeds from 300 to 600 m.p.h. at 20,000 ft. It is ...
The buckling of a square panel under shear when one pair of opposite edges is clamped, and the other pair is simply supported

D. M. A. Leggett (H. M. Stationery Office, 1941)

For an efficient design of spar with thin sheet web it is important to know the load which will just cause the web to buckle. As stiffeners divide the web into panels, it is required to find the buckling stress of rectangular ...
Design and development of a torsiograph having a serrated-condenser pick-up unit

B. C. Carter; J. R. Forshaw (H. M. Stationery Office, 1942)

The instrument that forms the subject for this report has a condenser pick-up unit to which a carrier wave is applied : it measures, directly, instantaneous angular displacements due to shaft twist. The pick-up originated ...
Torsiograph observations on a merlin ii engine, using a serrated-condenser pick-up, with five different pitch settings of the propeller blade

B. C. Carter; J. R. Forshaw (H. M. Stationery Office, 1943)

This report is based upon the first application of the torsiograph described in Reference I, the observations being made in the course of development of the instrument. Subsequent applications have been to Merlin 61 and ...
Blockage corrections in a closed rectangular tunnel

A. D. Young; H. B. Squire (H. M. Stationery Office, 1945)

PART I. Simple, Approximate Formulae for General Application. PART II. Note on the Blockage Correction for Streamline Bodies of Revolution
The difference between the spinning of model and full-scale aircraft

G. E. Pringle (H. M. Stationery Office, 1943)

It was required to review the technique of model spinning tests with the object of improving the reliability of model standards as applied to full scale.
The initial buckling of slightly curved panels under combined shear and compression

D. M. A. Leggett (H. M. Stationery Office, 1943)

The initial buckling of flat rectangular panels under combined shear and compression has been investigated theoretically in R. & M. 1965. This report extends the results given there to panels which are long and slightly ...
Further development of autogyro theory. parts 1 and 2

Lock, C. N. H. (H. M. Stationery Office, 1927)

The general theory of the autogyro given by Glauert in R. & M. 1111 is based on certain simplifying approximations and assumptions. The object of the present paper is to develop the theory still further by removing some ...
Derivative measurements and flutter tests on a model tapered wing

W. P. Jones; N. C. Lambourne (H. M. Stationery Office, 1941)

The influence of various parameters, such as wing density and flexural stiffness on the critical speed of a tapered wing was investigated theoretically in R. & M. 1782 using certain fundamental aerodynamic derivative ...

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