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Aviation History
1926
1926 - 0556.PDF
CORRESPONDENCE The Editor does not hold himself responsible for opinions expressed by correspondents. The names and addresses of the writers, not necessarily for publication, must in all cases accompany letters intended for insertion in these columns. AIRSCREW TIP SPEEDS [2143] In the article, " Airscrew Tip Speeds" (FLIGHT, July 29), the author has made too broad a statement concerning the decrease of the tip speeds in recent American racing 'planes. The accompanying table shows that since 1920 the tip speeds in such machines have in general con- tinuously increased, and that last year's Schneider Cup racer had a higher tip speed than any previously competing 'plane The data in the accompanying table are drawn from the official records. Prop. Tip 'Plane. Year. Engine. R.p.m. Dia. Speed. Material. ft. in. ft./sec. CR NW R-6 CR-1 F2W CR-2 NW-2 R2C-1 F2W-2 R2C-2 R3C-1 R3C-2 1920 1922 1922 1922 1923 1923 1923 1923 1924 1924 1925 1925 CD-12 T-2 D-12 D-12 T-2 D-12-A T-2 D-12-A T-3-A D-12-A V-1400 V-1400 1,950 1,950 2,250 2,200 2,200 2,300 2,000 2,400 2,300 2,400 2,500 2,550 7 7 7 7 8 7 9 7 7 8 7 8 6 8 4 10 0 10 0 8 9 4 8 0 767 784 864 903 922 943 943 963 933 1,047 1,005 1,068 VAL Walnut. Walnut. Walnut. Reed Dural. Walnut. Reed Dural. Forged Dural. Reed Dural. Forged Dural. Reed Dural. Forged Reed Forged Reed CRONSTEDT London, July 29, 1926. Board of Trade and Dating of Patents Committee A COMMITTEE has been appointed by the Board of Trade to consider whether any, and, if so, what change is desirable in the practice of (a) dating patents, applied for under Section 91 of the Patents Acts, as of the date of application in the foreign State ; and (b) dating patents granted upon ordinary applications as of the date of application in the United Kingdom. The main question which the committee has to examine is whether this practice should be continued or whether patents granted upon applications made under Section 91 should bear some later date, such as the date of application in this country, or the date of grant of the patent, while still giving the applicant the priority as regards inventorship which must be given to him under international arrangements. The committee will be glad to receive suggestions or representations upon the matters covered by their terms of reference. In considering the questions involved, the committee desires that due regard should be paid to all the interests involved, i.e., the interests of- inventors, manufac- turers, consumers, and the public generally. Communications should be addressed to the Secretary to the Committee, Mr. B. G. Crewe, The Patent Office, 25, Southampton Build- ings, London, W.C. 2. Not M. Laurent Eynac F"1 IN our issue of July 22, in the article on " The Progress of the Bristol ' Jupiter,' " we erroneously ascribed to M. Laurent Eynac, French Under-Secretary of State for Air, some statements on the subject of the " Jupiter " in France, in the Chamber of Deputies. These statements were actually made by the then War Minister, M. Painleve, and not by M. Eynac. The mistake was due to a misunderstanding. Nuri Pasha Al Sa'id THE Air Council entertained Nuri Pasha al Sa'id, C.M.G., D.S.O., Chief of Staff of the Iraq Army at luncheon at the Savoy Hotel on Thursday, July 22. " Sir Samuel Hoare, Secretary of State for Air, presided. Those present were Jafar Pasha el Askeri, C.M.G., Maj.-Gen. A. C. Daly, C.B., C.M.G., Air Marshal Sir John Salmond, K.C.B., C.M.G., C.V.O., D.S.O., Air Commodore C. L. N. Newall, C.M.G., C.B.E., A.M., Air Commodore A. M. Longmore, C.B., D.S.O., and Group Capt. C. S. Burnett, C.B.E., D.S.O. AUGUST 5, 1926 R.A.F. Flying Accidents THE Air Ministry regrets to announce that No. 157679 L.A.C. Robert IJoyd Carr died in Chester Royal Infirmary, on August 1, as the result of injuries sustained on July 13 in an accident at Sealand Garden City to a Snipe of No. 5 Flying Training School, Sealand. At the time of the accident L.A.C. Carr was the pilot and sole occupant of the aircraft. As the result of an accident at Multan, India, to a Bristol fighter of No. 31 Squadron, Ambala, on August 1, Flying Officer Jack Courtney Marcy, the pilot of the aircraft, and No. 62441 L.A.C. Percy William Edward Crunden were seriously injured. L.A.C. Crunden died of his injuries later in the day. PUBLICATIONS RECEIVED Aeronautical Research Committee, Reports and Memoranda : No. 992.—The Measurement of Torque Grading Along an Airscrew Blade. By G. P. Douglas and L. P. Coombes. June, 1925. Price ~9d. net. No. 994.—The Variation of the Performance of an Aeroplane with Wing Loading. By W. S. Farren. December, 1925. Price l.s. 6rf. net. No. 1002. - -An Experimental Investigation into the Properties of Certain Framed Structures having Redundant Bracing Members. Report No. 4. By Prof. A. J. Sutton Pippard. January, 1926. Price 6d. net. No. 1003.—On the Concen- tration of Stress in the Neighbourhood of a Small Spherical Flaw ; and On the Propagation of Fatigue Fractures in " Statistically Isotropic " Materials. By R. V. Southwell. January, 1926. Price Is. 3d. net. No. 1005.—Note on " Detonation " Temperatures in Closed Vessel Explosions. By R. W. Penning. March, 1926. Price 6rf. net. H.M. Stationery Office, Kingsway, London, W.C.2. The Motor Manual. 26fh Edition. Temple Press, Ltd., 7-15, Rosebery Avenue, London, E.C.I. Price 25. &d. net. Post free 25. lOd. The Air League Rulletin. Vol. 4. No. 63. July, 1926. Air League of the British Empire, 26, George Street, Hanover Square, London, W.I. Price Ad. Napier Aero Engines : Supplement to Napier Aero Engine Album. D. Napier and Son, Ltd., 14, New Burlington Street, London, W. 1. AERONAUTICAL PATENT SPECIFICATIONS Abbreviations : Cyl. = cylinder ; i.e. = internal combustion ; m. = motor. The numbers in brackets are those under which the Specifications willbe printed and abridged, etc. APPLIED FOR IN 1925 Published August 5, 1926 8,9)6. AIRSHIP GUARANTEE CO., LTD., and B. X. WALLIS. Manufacture of hollow or tubular metal struts, spars, etc. (254,782.)9,509. B. RIETTI. Blade arrangement in variable-pitch propellers. (232,242.)10,178. S. E. S.tUN'DERS. Aircraft floats, pontoons, etc. (254,820.) 17,717. DOUGLAS MOTORS, LTD., and C. K. PULLIN. Change-speed gear.(254,880.) 18,725. H. JI'NKERS. Scaffold frame for use in aircraft construction.(238,208.) 18,812. H. JI-XKERS. Scaffold frames for use in aircraft construction.(249,463.) 28,678. K. FERRE. Fire-extinguishing and alarm-signalling apparatus foruse on aircraft. (254,948.) FLIGHT The Aircraft Engineer and Airships 36, GREAT QUEEN STREET, KINGSWAY, W.C.2. Telegraphic address: Truditur, Westcent, London. Telephone : Gerrard 1828. SUBSCRIPTION RATES " FLIGHT" will be forwarded, post free, at the following rates:— UNITED KINGDOM s. d. 3 Months, Post Free.. 7 7 6 „ „ ..15 212 „ „ ..30 4 ABROAD* 3 Months, Post Free6 12 s. i.. 8 3 .16 6.33 0 Foreign subscriptions must be remitted in British currency. Cheques and Post Office Orders should be made payable to the Proprietors of " FLIGHT," 36, Great Queen Street, Kingsway, W.C.2, and crossed Westminster Bank. Should any difficulty be experienced in procuring " FLIGHT " from local newsvendors, intending readers can obtain each issue direct from the Publishing Office, by forwarding remittance as above. 486
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