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Aviation History
1910
1910 - 0129.PDF
FEBRUARY 19, 1910. For two-bladed propeller K = -65 l/PflHTl Ratio. Slip- Efficiency. •6 ... -167 ... 65-5 .. •8 ... -265 ... 68-5 .. i-o ... -307 ... 68-5 .. i'2 ... -345 ... 68-o .. Three-bladed propeller K •• -6 ... -ioo ... 67-0 .. •8 ... -2oo ... 70-5 .. i-o ... -250 ... 71-75 .. fa ... -300 ... 715 . Four-bladed propeller * = •6 ... -070 ... 67-5 . •8 ... -170 ... 71-0 .. i*o ... "220 ... 73-0 .. 1-2 ... '267 ... 73-0 .. r.p.m. . 900 . • 765 • . 650 . • 572 • = '49 •- • 834 . • 703 • 600 . • 535 • •42 :— . 806 . • 677 . • 577 - . 512 . uraKe Without Gearing. . 25-0 . • 239 . • 23-9 . . 24-1 . • 24-4 . • 23-2 . . 22-8 . . 22-9 . 24-2 . • 23-0 . . 22-4 . . 22-4 . n.p. With Gearing • • 26-3 .. 25-1 . 25-1 • 25-3 .. 25-6 .. 24-4 .. 24-0 .. 24*1 .. 25-4 .. 24-2 .. 23-6 .. 23-6 Hence if it is possible to fit a propeller of 8 ft. diameter we should have twelve propellers at our disposal. In this case none of the revolutions come up to engine speed. Consequently we should be forced to gear down. In this case therefore we have given the horse-power with and without gearing. It will be noticed that the best propellers are the four-bladed ones having pitch ratios of ro and r*a, each requiring 2 2'4-h,,p. direct and 23'6-h.p. through gearing, the difference being that one has to be geared down to about 580 r.p.m., and the other to 510. It will be seen also that a two-bladed propeller requires 25'3-h.p. It is a debatable point which of the two we should take, as the four-bladed propeller weighs twice as much and costs double the amount. To be concluded.) THE ROYAL AERO CLUB OF THE UNITED KINGDOM OFFICIAL NOTICES TO MEMBERS- Hon. C. S. Rolls. Roger W. Wallace, K.C. Annual General Meeting. The Annual General Meeting of the members of the Royal Aero Club of the United Kingdom will be held on Thursday, March 10th, 1910, at 5 o'clock, at 166, Piccadilly, London, W. Committee. In accordance with the rules, the Committee shall consist of eighteen members. Members are elected to serve for two years, half the Committee retiring annually. Retiring members are eligible for re-election. The retiring members of the Committee are :— Ernest C. Bucknall. Earl of Hardwicke. Vice - Admiral Sir Charles V. Ker-Seymer. Campbell, K.C.M.G.,C.B., J. T. C. Moore-Brabazon. D.S.O. Col. J. E. Capper, C.B., R.E. Martin Dale. The Earl of Hardwicke does not offer himself for re-election. Any two members of the Club can nominate a member to serve on the Committee, having previously obtained such member's consent. The name of such member so nominated, with the names of his proposer and seconder, must be sent to the Secretaries in writing not less than fourteen days before the annual general meeting. Wednesday, February 23rd, is the last day for the receipt of nominations. The following members have so far been nominated :— R. M. Balston. Martin Dale. Major Sir A. Bannerman, Bart., P. Harrington Edwards. R.E. Ernest C. Bucknall. F. Hedges Butler. Vice-Admiral Sir Charles Camp bell, K.C.M.G..C.B., D.S.O. Col. J. E. Capper, C.B., R.E. Major-General Cummins, C.B., D.S.O. Members are reminded that a ballot paper for the election of nine candidates to seats on the Committee of the Club will be forwarded to them at least seven days before the date of the annual general meeting. No ballot paper which is signed, or on which the number of candidates voted for is more or less than the number of vacancies, or which is received by the Secretaries later than 12 noon on Wednesday, March 9th, 1910, will be valid. Committee Meeting. A meeting of the Committee was held on Tuesday, the F5thinst., when there were present:—Mr. Roger W. Wallace, K.C., in the chair, Mr. Ernest C. Bucknall, Vice-Admiral Sir Charles Campbell, K.C.M.G., C.B., D.S.O., Mr. Martin Dale, Capt. A. H. W. Grubb, D.S.O., R.E., Professor A. K. Huntington, Mr. V. Ker- Seymer, Mr. J. T. C. Moore-Brabazon, Hon. C. S. Rolls, Mr. J- Lyons Sampson, Mr. Stanley Spooner, and joint secretaries, Capt. E. Claremont, R.N., and Harold E. Perrin. Philip Gardner. V. Ker-Seymer. E. Manville. J. T. C. Moore-Brabazon. Hon. C. S. Rolls. A. Mortimer Singer. Hon. A Stanley, M.P. R. W. Wallace, K.C. New Members. The following new members were elected :— E. Colmore. Major James Austin Meldon. Lieut. Charles Darbyshire. Arthur Pritchard. Clement J. Haydon. Frank Rendle. Flights at Shellbeach. The Hon. Maurice Egerton, on Saturday last, competed for the prizes offered by the Royal Aero Club at Shellbeach, and was success ful in winning a ^25 prize for a flight of 250 yards, and a £50 prize for a circular flight of I mile. The flights were observed by the Hon. C. S. Rolls, Capt. J. Spottiswoode, and Mr. Horace Short. Eastchurch Ground Committee. A meeting of the Eastchurch Ground Committee was held at Eastchurch on Friday, the nth inst., when there were present :— Professor A. K. Huntington, Mr. J. T. C. Moore-Brabazon, Hon. M. Egerton, Mr. H. Short, and H. E. Perrin. The Committee inspected the work in progress on the ground. The rules for the control of the flying ground were drawn up. It was decided to engage a day and night watchman. Aero Exhibition. The Aero Exhibition will be held at Olympia from the I Ith to the 19th March, 1910. A special section will be set apart for models, and full particulars can be obtained from the Royal Aero Club. Eastchurch Flying Ground- Commander Curtis and the Officers ef the Royal Naval Dep6t at Sheerness have kindly intimated that the members of the Royal Aero Club may consider themselves honorary members of their mess. Gordon-Bennett Balloon Race. Entries for the Gordon-Bennett Balloon Race close on the 22nd inst., and members wishing to compete are requested to notify the Secretaries on or before that date. Applications must be accom panied by a cheque for .£20, the entry fee, which amount will be returned should the entrant not be selected. The Race will take place in the United States. Gordon-Bennett Aviation Cup. Entries for the Gordon-Bennett Aviation Cup close on the 22nd inst., and members wishing to compete are requested to notify the Secretaries on or before that date. Applications must be accom panied by a cheque for ^20, the entry fee, which amount will be returned should the entrant not be selected. The Race will take place in the United States. The Hon. Maurice Egerton has sent in his entry. E. CLAREMONT, CAPT. R.N., HAROLD E. PERRIN, 166, Piccadilly. Joint Secretaries. 125
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