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Aviation History
1917
1917 - 0860.PDF
AUGUST 23, 1917. IKe Rbcral £Iero Cluof the, United Kiz\gda OFFICIAL NOTICES TO MEMBERS BE Club House. The following prices have been fixed for the present by the Committee:— Bedroom (including Bath) ;. 5s. each per night. Breakfast 2s. 6d. House Luncheon .. .. 2s. 6d. -^ House Dinner .. .. .. 3s. 6d. Billiard Room. The Billiard Room is now open for the use of the Members. THfi FLYING SERVICES FUND administered by THE ROYAL AERO CLUB. THE Flying Services Fund has been instituted by the Royal Aero Club for the benefit of officers and men of the Royal Naval Air Service and the Royal Flying Corps who are incapacitated on active service, and for the widows and dependants of those who are killed. The fund is intended for the benefit of all ranks, but especially for petty officers, non-commissioned officers and men. Forms of application for assistance can be obtained from the Royal Aero Club, 3, Clifford Street, New Bond Street, London, W. 1. Subscriptions. £ s. d. Total subscriptions received to Aug. 14th, 1917 11,882 19 10 2nd Lieut. L. Francis Jones, R.F.C. ... .. 1 1 o Total, August 2ist, 1917 11,884 Io H. E. PERRIN, Secretary. 3, Clifford Street, New Bond Street, W. 1. [As a number of letters reach us signed with initials only, some of which do not give a complete address, we would point out that such communications cannot be dealt with in our columns. Full name and address, which will not be published, must always be given.—ED.] Notice to Correspondents in General. Applications for commissions in the Royal Naval Air Service should be addressed to the Director of Air Services, Admiralty, S.W. The necessary form and conditions of entry can be obtained from the Secretary of the Admiralty. Applications for commissions in the Royal Flying Corps should 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 apply to the nearest naval recruiting station or to the R.N.A.S. Drafting Office, Crystal Palace, S.E. Skilled mechanics are taken whatever their army classification, but unskilled men are only taken if they are classified Bi, B2, or Ci. Recruiting for the R.F.C. is closed for the time being, and any enquiries should be made to the Officer Commanding, Royal Flying Corps Depot, Farnborough. Enquiries with regard to appointments in the A.I.D. should be addressed to the Chief Inspector, Aeronautical Inspection Department, Hotel Cecil, W.C. 2. E. M. R. (Swindon).—(1) The first-mentioned machine is an R.E. and the second a Bristol. (2) The " Spad " was illustrated in last week's issue of " FLIGHT." (3) " The Aeroplane Speaks " would probably meet your require- ments. ' (4) A Temporary Capt., R.F.C., draws Captain's pay and does not revert to the rank of Lieut, unless the rank of Temporary Capt. was given him while engaged on some' special duty, in which case he might, on being taken off such duty, revert to his former rank. (5) Yes. (6) There are several aeroplanes besides those built to R.A.F. designs in which four-bladed propellers are fitted. J. K. (Newcastle).—So far as we are aware, there is no book published which deals with the question of jigs and jig making. We are afraid you will have to rely on your own ingenuity for any improvements on existing types of wing rib jigs. J. W. T. (Eastbourne).—The subject of the most efficient number of blades to employ in an airscrew is much too extensive to be capable of being dealt with in this column. In a general way the four-bladed propeller revolving slowly is usually considered more efficient than the two-bladed screw revolving rapidly. It should be remembered that there are other influences to be considered. Thus, for instance, the diameter of an airscrew is generally made as large as the design of the aeroplane will allow, but considera- tions of the head resistance of a very high undercarriage lead to a limiting size in screws. Here the four-bladed propeller may be employed to obtain the efficiency of the large diameter two-bladed screw without calling for an unneces- sarily " stilty " undercarriage. Several " pusher " machines have been built in which the four-bladed screw was em- ployed. J. R. K. (Newcastle).—The reason why the sections used on full size aeroplanes are often found to give indifferent results on models is chiefly that in a model it is difficult to so attach the fabric that it follows with the desired amount of accuracy the curvature of the ribs, which latter, being of small size, are themselves difficult to make exactly to scale. It is, we believe, generally found that for model work a deeply cambered section is the best, and frequently single surface covering is employed. In the large scale model you have in mind it should be possible to follow fairly closely any given wing section, and we should think that the wing section known as U.S.A. 4, and of which full particulars are pub- lished elsewhere in this issue, would be found quite good for a large scale model. A. S. (Lincoln).—Without knowing the actual resistance of a bun-shaped surface like the envelope of a parachute, it is difficult to calculate exactly the rate of dropping or, in- versely, the area required to limit the rate of fall to a certain velocity. An approximate estimate may, however, be made by assuming that the parachute is a flat plate travelling normal to the relative wind. If we take the parachute as being of 28 ft. diameter, and the total weight (including pilot) "as being 150 lbs., we can make use of the formula R = KAV», where R is the total resistance of the plate in lbs., K is a constant varying, however, with the size of the plate, A is the area of the plate, and V is the velocity in miles per hour. In our case R is therefore 150 lbs., K for a plate of the size of this parachute will be about -00327, and the area of a parachute of 28 ft. diameter will be taken as being roundly 600 sq. ft. We can now write V = \ /—^ = A / — =8-7 m.p.h., .: .-• V KA V -00327 x 600 '".'•' approximately, or 13-6 ft./sec, which should be a fairly safe speed at which to alight. A New German "Invisible " Machine. I LEARN from a reliable source that the Zeppelin •works at Friedrichshafen are being used for the building of a new type of aeroplane, from which much is expected, says the Daily Mail correspondent at Vevey. The fuselage (carriage) of the new machine is serpentine in form, and from both sides it is possible to emit dense clouds of smoke which entirely conceal the machine. Last week the King of Bulgaria and his eldest son were present at the trials of several of the new aeroplanes. . 860
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