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Aviation History
1943
1943 - 0517.PDF
FEBRUARY 25TH, 1943 FLIGHT 209 HIGH-ALTITUDE FLIGHT which from wind-tunnel tests is quite efficient aerodynamically. In the illustration the two arcs have been faired in to provide greater floor width. This arrangement for the~ cabin section represents a greater weight expenditure, since it involves the support of a certain portion of the load by bending. The bending moment at any point p in the region shown is ^—f.,) P.N., where P is the pressure differ- ential and N the normal distance of p from the tangent line c d. A modified equation holds for the upper portion of the arc; and in all cases the tension load in the floor = P.A. The advantages of these sections de- crease in comparison with a circular sec- tion as the size of the a i r c ra f t in- creases. The circular section should find favour in very large aircraft, but where the overall width is under twelve feet the double-arc section will be advan- tageous in providing greater depth. Passing control rods through the walls of the pressure cabin demands ingenuity and careful design. The arrange- ment by the Henschel Co. is, therefore, interesting. The scheme provides for a push-pull control via a packing gland fitted where the control rods pass through the cabin walls. Tubular sleeves surround an appreciable length of the rods and have their ends attached to the wall of the pressure chamber. They are, of course, made of elastic material. These elastic tubes operate in the manner of bellows and prevent leakage from the cabin. A second scheme dis- penses with the tubular sleeves, but the gland incorporates a leak-well and drain, leakage past the joint entering the wall to return via the drain. D.V.L. tensioned skin cabin mounted in a girder fuselage. Data for calculating stresses in double-arc, section cabin. TUBULARSLEEVES OF ELASTICMATERIAL CONTROLRODS Preventing leakage where control rods pass through the cabinwalls. Henschel method. BRITISH OVERSEAS AIRWAYS' WAR RECORD More than a Dozen Different Types in Service SOME striking figures have just been issued by BritishOverseas Airways. They show that during 1942 their land- planes and flying boats flew about 10,000,000 miles in an aggre- gate flying time of about 67,250 hours, and carrying 43,000 passengers, 950 tons of mails, and 2,250 tons of freight. This is a distinctly creditable achievement considering that aircraft have frequently to fly through war areas and that the machines are unarmed. Expressed in ton/miles, the capacity handled during the year amounted to 21,600,000, compared with 12,587,294 ton/ miles in 1941 and 8,674,972 ton/miles in 1940. The total passenger/miles flown were approximately 91,000,000. The nature of the Corporation's wartime activities is shown by the following list of the routes at present in operation. Flying Boats: Boeing 314s: Three services every thirty days, Baltimore-United Kingdom via Bermuda and Lisbon; Lagos-Baltimore via South Atlantic; Lagos-United Kingdom. Catalinas: United Kingdom-Lagos.Short '•(;•• Class: Varying frequency United Kingdom- Foynes and United Kingdom-Lisbon. Short " C" Class: Durban-Calcutta and Cairo-Lagos. Landplanes : "F" Class (Frobisher) and Whiileys: Vatyiug frequencyWest of England-Eire (to connect with P.A.A., A.E.A. and Hoeing Services). North Atlantic Return Ferrv: Liberators: Several servicesweekly Montreal-United Kingdom. Liberators: United Kingdom-Lagos and United Kingdom-Lisbon. Douglas D.C.$s: United Kingdom-Lisbon. Several servicesa week. Lockheed 14, Lodestar or Hudson : Cairo-Teheran, Teheran-Habbaniyeh, Khartoum-Nairobi, Asmara-Addis Ababa, Cairo- Asmara, Asmara-Karachi. "E" Class (Ensign): Khartoum-Lagos. Varying frequencyK hartoum- Asmara. Wellingtons: Cairo-Karachi. Lockheed 10A, 14, Lodestar, Hudson 01 Wellington: Varyingfrequency between Cairo and Western Desert. A Madagascar service is now in operation between Kisumuand Diego Suarez via Mombasa, Dar-es-Salaam and Lindi and Pamanji. The foregoing list does not include certain serviceswhich are not mentioned for security reasons, and frequencies of certain services are omitted for similar considerations.
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