Aircraft Engineering and Aerospace Technology

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030869

A PART from developments which may be taking place in other countries, the fact that in Italy the CaproniCampihi jetpropulsion aeroplane has reached the practical flying stage and has already carried out a number of crosscountry flightsone photograph that has been reproduced over here shows it over the centre of Milanbrings this type of airscrewless machine definitely into the picture. Wc arc, therefore, publishing in full, complete with all the illustrations found in the original, a Ministry of Aircraft Production translation of a series of articles which appeared in he German paper Flugsport in January and February, 1939.

Gohlke,

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030870

EVERYBODY travelling in air or water by its own power applies the reaction or repulse principle, that is to say, it either takes up parts of masses contained within itself or, by means of suitable organs, gathers up parts of the surrounding fluid medium and accelerates these masses at a speed greater than its own travelling speed, and this generally in the direction opposite to that in which it desires to travel whilst in certain cases, in addition to the force produced by the repulse, a further force is obtained through the forward suction of the fluid medium. Devices intended to utilize only the negative pressure produced by suction, e.g. through lateral ejection by means of radial surfaces running at very high fivefigure r.p.m. have not, in spite of repeated endeavours, proved successful.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030871

Solution. The gliding ratio required is 706 2215 171. At present, with an allup weight of 500 lb., this is generated at 62 m.p.h. we require it to be generated at 70 m.p.h. The dividers are therefore set with their points at 62 and 70 on the Forward Speed scale and transferred to the Weight Scale, whence it is seen that the necessary allup weight is 640 lb. The ballast required is therefore 140 lb. Application of the dividers to the various scales shows the new performance figures to be

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030872

ALIVE to the new problems resulting from the advent of higher power engines and the need for increased aeroplane speeds and greater operational heights, Rotol Airscrews Ltd., have evolved what is claimed to be the first feathering constant speed contrarotating airscrew. It may be of interest therefore to indicate how the contrarotating airscrew has overcome the difficulty of efficiently converting engine power into thrust, eliminating automatically the effect of torque reaction on the aircraft, neutralizing swing at takeoff, or upon sudden opening and closing of the throttle in flight, and thus generally improving manoeuvrability.

Turner, Keith W.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030873

THE glider presents a simpler problem to the performance calculator than does the enginedriven aeroplane a problem free from the variables that are inevitably introduced when propulsion is derived from a complicated system of engine and airscrew. Nevertheless, the process of determining the performance to be expected of any projected glider design is usually quite a lengthy one and if, in addition, an investigation is to be made into the effects of varying all the factors concerned, with a view to finding their optimum values, the process becomes so lengthy that in practice it is sometimes neglected. Glider development then tends to proceed along what may be described as Darwinian lines, and progress becomes unnecessarily slow the evolution of gliders to fit new operational requirements as they arise takes longer than it need.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030874

DEAR SIR, With reference to Mr. Andrews's interesting article in the December issue of Aircraft ENGINEERING, there appears to have been some error in the constant used in equation 18. The text gives a value of 60,000, but the correct value would appear to be 83,100 36,900.444

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030875

It has been reported in previous papers that Xray studies of the magnetic ironnickelaluminium ternary system resulted in the discovery of a new phase ', as well as a complete change both in the ternary equilibrium diagram and in the explanation of the cause of the high coercivity in this system.

Hildebrandt, H.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030876

TOGETHER with other interested bodies, the Arbeitseinsatzverwaltung Labour Utilization Administration, has or long been devoting increasing attention to the problem of supplementary training in the metal working industries. Formerly, these measures for the schooling and training of metalworkers had been directed principally at improving the personal standard of efficiency of the individual recently they have assumed a wider importance on account of the shortage of labour in certain of the metalworking trades. The Labour Exchanges have concerned themselves directly with these schemes in past years, with financial support, in collaboration with other agencies. Between 1933 and 1938, the training schemes sponsored by the Retch Labour Administration ReichsArbeitsverwaltung, dealt with a total of some 390,000 workers.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030877

THE need for the conservation of materials has stimulated interest in the various methods of salvaging components which have become worn in service or inadvertently machined undersize. The practical methods now employed include electrodeposition, fescolizing, bronze welding and metal spraying. There remains a good deal to be learnt on the subject from the technical point of view, and it can safely be said to have touched only the fringe of the vast wastage of scrap components which could be recovered, with considerable saving in material, labour and money.

Schroeder, A.J.

1942 Aircraft Engineering and Aerospace Technology

doi: 10.1108/eb030878

THE manufacture of any goods can be divided into two mental actions that of contriving and designing, as pure brain work and of production, as a combination of mental and handicraft processes. Invention and design signify intellectual construction in the same way that production deals with material construction. The engineer, no matter whether designer or production engineer, is, therefore, the constructor in the truest sense of the word.