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Aviation History
1917
1917 - 0371.PDF
APRIL 19, 1917. Notice to Correspondents in General. Applications for commissions in the Royal Naval Air Serviceshould be addressed to the Director of Air Services, Admiralty, S.W. The necessary form and conditions of entry can beobtained from the Secretary of the Admiralty. Applications for commissions in the Royal Flying Corpsshould be sent to the Director-General of Military Aeronautics, Hotel Cecil, Strand, W.C. Those who wish to enlist in the R.N.A.S. should applyto the nearest naval recruiting station or to the R.N.A.S. Drafting Office, Crystal Palace, S.E. Skilled mechanicsare taken whatever their army classification, but unskilled men are only taken if they are classified Bi, B2, or Ci. For enlistment in the R.F.C. apply to Major Mitchell,the Polytechnic, Regent Street, W. Men who are classed Bi or B2 are wanted as armourers, acetylene welders,carpenters, coppersmiths, motor transport drivers, electricians, engineer fitters, watchmakers, instrument repairers, wirelesstelegraphy, cabinet makers as riggers, tailors as sail-makers, vulcanisers, petrol winch drivers, fitters. Unskilled Biand B2 men are also wanted for the balloon party and labour section and C2 or C3 men who are tailors and shoe-makers. Motor cyclists if with good eyesight are also accepted. H. C. B. (2nd A.-M.) ~ - •>. The nearest approach to the figures you require is pro-vided by a set of experiments carried out by Mons. G. Eiffel v- HCB i F^ — measuring 90 x 15 cm. and having an angle of incidence of6°, the rear one measuring 45 x 15 cm. and having an angle of incidence of 1°. The distance between the trailing edge ofthe front plane and the leading edge of the rear one was kept constant during the tests and measured 40 centimetres. Therear plane was then raised and lowered in relation to the front one, and the forces measured for each position. Thearrangement will be clear from the diagram. The rear plane, when tested by itself at an angle of incidence of 2° gave an"absolute" drag coefficient of o-o2o8 and a lift coefficient (absolute) of o"i8. When placed behind the other planejand above or below it) the following values of the lift coefficient were obtained :— Values ofd and d xin cm. 0 10 20 30 Ky for d(Abso- lute.).0056 .0472 .0712 .0928 Ky for dx(Abso- lute.).0056 .0211 .0448 .0736 Values ofd and d 1in cm. 40 50 60 70 Ky for d(Abso- lute.).1088 .1600 .1232 .1288 Ky for <tf, (Abso- lute.) .0960 . 1120 .1200 .1312 at his laboratory at Auteuil. In these experiments twosurfaces were placed£behind one another, the front one From the table it will be seen that even when the verticaldistance between the two planes is 70 cm. the lift coefficient of the rear plane is very considerably smaller than that ofthe rear plane when tested by itself, the two values being 0-18 and 0-1312 respectively. As far as could be ascer-tained by the experiments the drag coefficient remained unaffected for all positions of the rear plane. A. C. (Waltham Abbey). Opinions are somewhat divided as to the relative efficiencyof two-bladed and four-bladed propellers. For a given diameter there is probably not a great deal of differencebetween the efficiencies of the two types, but where a four- bladed propeller is used the diameter can be kept smaller,thus making it possible to cut down the height of the under- carriage, which is, of course, equivalent to saying that asaving in resistance can be effected. Full-size helicopters have been built, but to the best of our knowledge none hasever got off the ground with passengers. Scale drawings of the Mersey monoplane have not been published in " FLIGHT,"but some excellent photographs and a few sketches, showing various features of this machine, were published in the issueof " FLIGHT " for August 17th, 1912, a copy of which can beobtained from the offices of " FLIGHT." The price is is. jd.post free. S. J. D. (Highbury). -:^v, '.-"\ . '•:•:; V \S •""'""-.:: ':'•,•'>'• " The pay of a Flying Officer is 12s. a-day (increasing by is. a-day for each year of service up to 16s.) plus 8s. flying pay. J. F. (Wimbledon) and E. M. (Burgess Hill). -:; -'•' I '• Write to the R.N.A.S. Drafting Office, Crystal Palace, S.E. G. M. (Grantham). Full description, with scale drawings, photographs and sketches of the Albatros reconnaissance biplane appeared in " FLIGHT" of November 26th, 1915. The Albatros fighting biplane was similarly treated in " FLIGHT " of December 24th, 1915. The L.V.G. fighting biplane was described in " FLIGHT " of June 22nd, 1916. U. S. (Brockley). Lincoln Beachy used a Curtiss biplane when he flew overNiagara Falls on June 27th, 1911. A photograph of the machine passing under the upper steel bridge over the fallsappeared in " FLIGHT" of August 5th, 1911. •;.i*- ttoyal Honour for Flying Services.IT was officially announced on April 13th that the King has been graciously pleased to become Colonel-in-Chief ofthe Royal Flying Corps (Naval and 'Military Wings), to mark his admiration of the splendid services whichboth wings have rendered since the commencement of the war. Women Storekeepers for the R.F.C. IT is announced that 30 women storekeepers, withknowledge of motor parts, are wanted at once for the Royal Flying Corps. Women who have had a course of instructionin motor driving and who are not now driving would be most suitable for this work. Applications to be made to the Director,National Service, Women's Section, St. Ermin's, S.W. 1. 371
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