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Aviation History
1947
1947 - 2151.PDF
DECEMBER I8TH, 1947 FLIGHT 685 be more expeditious to do this over the airfield thanat a beacon which was being used by other aircraft. The assumption that navigation by MF Beacons is theHighest Common Factor that can be depended upon is no doubt justified, but the M.C.A. plan, while designedto control aircraft fitted with MF only, allows aircraft to enter the Zone along B 14.6, and follow that lattice untilthey do so at, or near, the appropriate Beacon. For example, an aircraft from the West may enter the Zoneby means of the Reading intersection, but would count for purposes of separation and clearance as Woodley traffic. This feature of the plan will enable Gee-fitted aircraftto enter the Zone and make a Let-Down by a simple pro- cedure involving Gee and SBA. Gee lattice lines can begf selected which would enable aircraft to be navigated from each of the three points of entry .applicable to Northolt,and the Free Sector, to a "Gate" on the SBA Beam at 10 n.m. from the Main Beacon. The aircraft would approach the Boundary of the Con-trol Zone along the prescribed lattice line, and, when permission had been given to change to the Approachfrequency and to enter the Control .Zone, would continue along the Lattice Line to the Gate. Normally, communi-cation with Approach Control will be on VHF R / T by the First Officer, leaving the Radio Officer free to operate Gee. This procedure, as it would operate at Northolt withRunway 13 in use, is shown in the diagram. Traffic from the N.W.-N.E. Sector (e.g., the Glasgow service) wouldenter the Zone along B 14.6, and follow that lattice until C 37.8 was reached. A Rate-one Turn to Port of 400 wouldbring the aircraft into the Beam at 10 n.m. from the Main Beacon. Traffic from N.E.-S. (e.g., Amsterdam or Geneva)would have a more complicated route. Entering on C 37.0 the aircraft would fly westwards over Ruislip Reservoir,whence a contact landing would be made if possible ; if not, the aircraft would continue out to B 14.5, where astarboard turn through 2150 would bring it into the Beam. The approach from the S.-N.W. Sector (e.g., Jersey) wouldbe simple, following C 37.5 to B 14.6 and then turning starboard into the Beam. The pattern for Runway 26 (if the Beam were opera-tional) would be similar; both have been flight-checked and found practicable, provided the aircraft arrives atthe Gate with wheels down, speed reduced, and at a height not greater than 2,000ft QFE. When VFR conditions apply, or when for any reason aBeam approach is not possible or not necessary, a "Cir- cuit Homing " procedure is provided by means of Gee tobring the aircraft, not to the centre of the airfield, but into the circuit. An extension of the Gee/Beam procedure to other air-ports is not immediately contemplated, and will depend on many circumstances, including, of course, the degree ofsuccess achieved in the Metropolitan Zone. HELICOPTER PROBLEMS '"TREATING the rotor of a helicopter as a disc, without -1- taking into account the number of blades, Mr. H. B. Squire, of the Royal Aircraft Establishment, took the theories developed by Glauert and Lock a step farther in his Paper read before the Helicopter Association of Great Britain on December 6th. The Paper was very far from being of a popular nature, and several members of the audience frankly admitted that they did not understand it. The lecturer dealt with calculations of the induced velocity field and with rotor interference in multi-rotor helicopters. The spacing *was important both in tandem and in side-by-side rotor arrangements. Close spacing reduced induced drag in side-by-side rotors, but increased it in a tandem arrangement. CENTRAL PHOTOGRAPHIC ESTABLISHMENT IN connection with a photographic reconnaissance conference,held at the R.A.F. Central Photographic Establishment from December 10th to 19th, an exhibition of the latest cameras and air survey technique was on show in one of the hangars at Benson airfield, the home of C.P.E. Of particular interest was the application of radar to air survey, and the employment of moving film cameras in place of the orthodox type for high- speed low-level photography. A review of the highlights of the exhibition will appear in th; next issue of Flight. l/llAPPRECIATION : Capt. Lamplugh making Capt. Lamplug gf silvtr salver to Leslie Irvin at Londonderry House. reported in last week's issue. night fjiuu f The ceremony TAX CONCESSION FOR R.A.F. RESERVES AND AUXILIARIES •JX/TEMBERS of the R.A.F. auxiliary and reserve forces are •"•*• to have an exemption from income-tax for training expense allowance and bounty payments, and this exemption will be retrospective from April Gth, 1947. Ordinary pay and taxable allowance paid for periods of continuous training exceeding 48 hours' duration are not included. The training expenses allowance included in the exemptions is that which is paid at an hourly rate for training periods of less than 48 hours, The bounties included are the flying- training bounty (formerly "retaining fees") payable to flying members of the R.A.F.V.R., the Auxiliary Air Force, the Reserve of Air Force Officers, and the W.A.A.F./V.R. list (flying); annual bounties payable to ground airmen of the R.A.F.V.R. and A.A.F. and to airwomen of the VV.A.A.F. reserve list; and the flying-training bounty oi £10 a year for airmen of Class E of the R.A.F. Reserve. ATOMIC PHYSICS FILM "OEFORE an international audience, an authoritative film on -*-' the development of atomic energy was given its first showing in London recently. Seriously conceived and care- fully produced, it was prepared with the co-operation of eminent scientists, learned societies and research institutions. The subject is dealt with historically, and the long series of discoveries is presented in chronological order. Either the actual experimental equipment used or scientifically accurate replicas are shown in the film, and carefully preserved sequences of such eminent men as Sir J. Thomson and Lord Rutherford speaking on atomic theory are introduced. The film falls naturally into five parts: Atomic theory; rays from atoms ; nuclear structure ; atom smashing and uranium fission—which can be shown individually or as a continuous whole. Animated diagrams are an outstanding feature, and the photography of such difficult subjects as electron tracks in cloud chambers is excellent. Short sequences of the first atomic bomb in Mexico, the Hiroshima bombardment and t'.ie Bikini test vividly show the destructive potentialities. Living authorities, Prof. Einstein, Dr. Cockcroft, and Prof. Frisch, discuss the present stage of development, and the prospect of peaceful utilization. Close-ups of Hitler haranguing, and shots of Nazi military parades, strike a somewhat incongruous note in this record of continuous scientific endeavour dating from the year 1808, when John Dalton propounded the atomic theory. They were probably taken before uranium fission was discovered in 1939. The elision of the nationality and domicile of the woman ^scientist Lise Meitner and Prof. Frisch, who first noticed this phenomenon, is not expected in a strictly factual film of this Character. These, however, are minor criticisms. G-B Instructional, Ltd., a branch of the J. Arthur Rank Organiza- tion, is to be congratulated on the production of a fine film of absorbing interest and undeniable educational value.
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