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Aviation History
1949
1949 - 1069.PDF
674 FLIGHT JUNE gra, 1949 The Pressure-Jet Helicopter pressor duct to the blade duct, and thus avoid a duct which had to rotate and translate in a shearing sense at the same time. Where almost pure rotation existed, as in a flapping- hinge rotor, a flexible duct of rubberized fabric was ade- quate. In either case, however, care had to be exercised in minimizing pressure losses and pulsations of the com- pressor due to cyclic change in flexible duct area. The blade and control loads in large diameter rotors were relatively greater in a high acceleration manoeuvre for a teetering than for a flapping rotor system, and would be a consideration for the larger rotor systems. Where the rotor design and power-plant were so intimately related as in the pressure cycle, the design problems were necessarily more complicated. However, jet power-plants were available to-day which made the pressure-cycle jet helicopter very attractive for missions involving large payloads for short range. PRE-FARRICATED RADIO STATIONS THE design and assembly of a number of pre-fabricated air radio stations for the BurmeseGovernment was recently carried out by Inter- national Aeradio, Ltd,, at their Bovingdon work-shops. As this type of station is likely to prove valuable to those authorities who may require equip-ment which can be installed rapidly in case of emer- gency, or who are unable to employ sufficient highlyskilled technical staff to supervise normal installa- tion work, I.A.L. have now designed a series of" pack-up " stations providing various facilities. The series at present available is as follows: —Model A: Two V.H.F. R/T channels (or one plus standby).Model B: Two V.H.F. R/T channels. V.H.F. D/F (manual).Model C: Two V.H.F. R/T channels. V.H.F D/F (manual).Five H.F. R/T or W/T channels. All these models are designed on the assumptionthat the equipment will be housed in the control 'room. If a separate room is available there arefurther models (D, E and F) providing for remote control. Either one- or two-man operation can be catered for and, ofcourse, Other facilities can be included. Low-power V.H.F. transmitters are used, as it is con-sidered that this type should be adequate for most purposes. If higher-power transmitters are required they can be incor- Proposed new installation of airport communications and D/F equipment by International Aeradio. porated. Auxiliary diesel- or petrol-electric generators can be supplied if no other source of power is available. The stations are completely pre-fabricated with ail inter- connecting cables and plugs in place and can be readily dis- mantled for air transport and re-dketed on site with the mini- mum of supervision. COMING EVENTS . . . ? SPEAKING at the recent annual general meeting of thede Havilland Engine Co., Ltd., Major Frank B. Halford (chairman and technical director) concluded his report with these words: — " Beyond the scope of the gas turbine which uses the air for combustion we are convinced of the demand for rocket motors which carry their own oxygen supply, and believe that they will be needed for special purposes in both military and civil flying. Accordingly we are not neglecting this develop- ment. "In this respect, as always, we are reminded of the policy of the de Havilland enterprise . . . w-hich is to provide the aircraft complete with its power unit, and I must again emphasize the indispensability of this association in the advancing maturity of aviation." In his review of the year's work, which preceded the above remarks, Major Halford mentioned that at no time, even during the war, had the company's engine output been so great as it was to-day. AIR TOURIST'S VADE-MECUM "PREPARED for the Private Aviation Division of the F.A.I. -t by the Air Touring Department of the R.Ae.C, the new Air Touring Guide to Europe, 1949-50, is a companion to two practical guides already issued, namely, those dealing with the routes to South Africa and Australasia. Those responsible deserve congratulation on having packed an extraordinarily large amount of useful information into a pocket-size book (5m x 7jin x -fein) of 222 pages while return- ing reasonably large type and clear presentation which should facilitate quick reference in the air. Contents include pre-flight planning (passports, clearance, currency, health regulations, etc.) ; an eight-language aviation vocabulary; outline maps of nine suggested routes to Con- tinental centres, with course-and-distance tables; details of airfields" (classified under countries) hangarage and refuelling costs; conversion tables; and sunrise and sunset tables. In a radio facilities section is a selection of aerodrome approach charts contributed by International Aeradio, Ltd., as typical of those in their Flight Guide. The R.Ae. C. hopes to issue a new edition of the Air Touring Guide to Europe each year, with the necessary revisions incor- porated. Copies are obtainable at 7s 6d (8s by post) from the Air Touring Department, Royal Aero Club Aviation Centre, Londonderry House, 19, Park Lane, London, W.i. PROGRESS IN PICTURES PACKED with photographs of aircraft, ships, cars, motorcycles and stationary engines, a first-rate little book, en- titled 50 Years of Progress in Scientific Lubrication, has beenproduced to mark the Castrol jubilee. A limited number of free copies is available to readers of Flight who apply to C. C.Wakefield and Co., Ltd., Dept. JF, 46, Grosvenor St. London, W.i. INVITATIONS FROM THE CONTINENTD OCTOR A. P. THURSTON, M.B.E., D.Sc, M.I.Mech.E., F.R.Ae.S., writes to say that Father R. Amiard, vice- president of the Aero Club de Basse-Normandie, has asked him to invite British aircraft owners to support the second Flers de l'Orne rally, due to take place on June i8th-i9th. The programme for the week-end includes an arrival com- petition, banquets, gala dance, various receptions, a flying display and a competition for Jetex-powered model aircraft. Free hospitality and accommodation is offered to each pilot, while passengers may attend at an inclusive cost of about £4 each from the Saturday morning to the Sunday evening. Entries, which must be made immediately, can be sent in through the R.Ae.C. or direct to the secretary of the Aero Club de Basse-Normandie, Flers de l'Orne, France. Another Continental event to which Dr. Thurston has been asked to invite British pilots is the "Blue Day" rally and display at Centocello Airport, Rome, on June 29th. Again, entries may be made through the R.Ae.C. or to the Aero Club di Roma, Via Cesare Beccaria 35, Rome. B 12
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