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Aviation History
1912
1912 - 1123.PDF
NOVEMBER 30, 1912. the building of two models-the first one for practice for levin* aixl for experiment, and from the knowledge so gained °L;buM the actual machine intended for exhibition Turning now to (6), hand-launched models, minimum weitrht 4 oz., we sincerely trust that this will not degenerate"into am flying-stick competition. generate into a mere Design and construe ion still score 50 marks and stability so With regard to the latter, the A frame twin-propeller model ow£ often (not always) ,o its speed and the absence of all gyroS effect exhibits, or to an ordinary observer would appear fo eS whnst actually flying in the air, a really remarkable stability even when flying in a gale when, however, the power has run out! even .n all absence of wind the glide to earth is, alas, too often chiefly conspicuous by its absence ; here again a single propeller 2 flying model exhibiting good stability throughout would be certain to score. A geared motor similar to the one already described can be used in this case as well. It has a decided steadying effect on the model and enables the designer to approximate closer to the actual dimensions (total span to length ratio) employed in full-sized design. N.B.—All models exhibited at Olympia must be fitted with a suitable and proper protector. Mr. F. W. Jannaway's Models. We give this week two illu-t-ations of the above. Mr. Tannaway is one of London's most enthusiastic amateur aeromodellists (not of the flying-stick type), and his work certainly deserves eveiy en couragement. The following are the chief particulars :— Fig. 1. R.o.g. model —Main plane span 28 ins., chord 6 ins • elevator span 8 ins., chord 3 ins. ; "A" frame 38 ins. long, with a strong chassis and skid; propellers (twin) 8 ins. diam., 16-5 ins. pitch ; total weight of machine Qoz;. ; total weight of rubber 2\ ozs. In the Gamage Cup competition this model flew t,000ft., and in the amateur off-the-ground, the duration was 39 sees., with a run of 3 fr. 9 ins. ; awarded second place. For some time this model also held the official r.o.g. distance recoid. Fig. 2. Single-screw tractor plane (the one Mr. Jannaway is holding).—Length 36 ins., span 241ns., chord of plane 5 ins.; tail sins, by 6ins., fan-shaped ; propeller diam. 10ins. ; total weight ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Records. Hand-launched ... (^stance ... A. E. Woollard ... 477 yards. I Duration ... A. F. Houlberg ... 89 sees. Off ground ... . (Distance ... G.Rowlands 232 yards. t Duration ... A. F. Houlberg ... 51 sees. Hydro, off water ... Duration ... G. P. Bragg-Smitb ... 25 sees. Single-tractor screw, (Distance ... H.R.Weston ... 84 yards. band-launched ...(.Duration ... F. W. Jannaway ... 22 sees. Next Official Trials.—The next official trials will, by the invitation 01 the Northern Branch Aero Models Association, take place on their ground on Saturday, December 14th. All entries for these trials to be made on the official forms (which can be had on application), and should be sent in at once. 27, Victory Road, Wimbledon. u >iiiouiu 1 '\^ jy 111 111 m vjivb< W. H. AK.EHURST, Hon. Sec. & ® ® ® MODEL CLUB DIARY AND REPORTS. CLUB reports of chief work done will be published monthly for the future. Secretaries' reports, to be included, must reach the Editor OQ the last Monday in each month. Aero-Models Assoc (N. Branch) (15, HIGHGATE AVENUE, N.). NOVEMBER 30TH. The duration competition for month, at Finchley ; prize of goods value 3^. 6d. December 14th. The K. and M.A.A.'s monthly trials for records, Finchley. December 21st. R.o.g. contest combined with speed. Time taken for model from time of release till it crosses a line 150 yards down wind. Prizes; 1st, Trophy value ioi-. ; 2nd, Goods or prize value 5J. Both above prizes kindly presented by Mr. G. Pidsley. December 28th. Monthly duration com petition (as November 30th). Monthly Report.—Work du'insr October chiefly consisted of experimental tests for the " Enfield " challenge trophy. Also the tractor record, previously held by F. J. Hindsley, with 23 sees , was raised to 35 sees, by B. Brown, on October 5th. The contest for the " Enfield " challenge trophy was run off on November 2nd. The Asro Models Association, Northern Branch. Mr. Fletcher's model. I/UCHT1 64 ozs. : weight of rubber 1 \ ozs. Won bronze medal K. and M. A. A. competition. At present holds the official record for tractors, with a night of 22 sees. Hydro-Aeroplane Mode,— Length, 36 ins.; span, 22 ins. ; chord ot plane, 4-5 ins. ; elevator, Sins, bv 225 ins. ; propeller*, twin, b ins. ; 16-5 ins. pitch ; total weight of machine with rubber and floats 10 ozs. front float, 8 ins. by 2 ins. by 2 ins. Main floats, 12 ins. by 2 ins. by 2 ins., built up of veneer wood silked over and varnished. Weight of rubber, 24 OK. I'laced 6th in the second hydro aeroplane competition at Hendon. Model Club for South-East London. Mr- A- B- Clark (Rochester House, 196, Brockley Road, ilrockley, S.E.), a well-known aeromodellist, having (during the past Jew months) been frequently asked to organise another model km soutneast London, and having resigned his connection with the Blackheath Club, will lie glad to hear from anyone interested in scientific aero-model work in south-east London with a view to form ing a club in which the flying stick will not be encouraged, although it will not be banned. The chief aim in the new club will be to give every possible encouragement to the more scientific side of model aeroplaning. There is undoubtedly room for such a club always provided that it adheres at all costs to its original intention. Query. We reprint Mr. C. J. Temperley's query, inserted some weeks ago, to which as yet not a single reply has been received. We might just add that a good reply would form an excellent subject for a FLIGHT prize and certificate of merit. The query was as follows :—(1) The ratio of lifting surface to weight. (2) Surface to weight of rubber. (3) To thrust or pitch or diameter of propeller. (4) Total weight of machine to weight of rubber. R.O.G. model. Replies In Brief. . E. ROGERS.—The pressure on our space precludes us doing as you suggest as a rule, but when possible we will do so. We will make use of your communication later on, H. R. HONEYIKINE.— The sketch which you send is not clear, for instance, the elevator appears totally unfastened at its trailing edge. ® ® Models were required to rise from ground, and the results were based on the Duration (sees.) x wt. of machine (oz.). tormuta: Wt rf tu\,\xr (oz_) Very fair weather conditions prevailed, and the contest was made highly successful by the strong turn-out 01 members and friends. Result: H. E. Fletcher, 49 sees.; points scored, 163-3. Particulars of machine: Monoplane non-lifting tail-behind type; weight of model, 6ozs. (flying order); weiitht of rubber, i"8 ozs., 9 strands of J strip. Machine lose smoothly after a run of 14 ft., the climbing angle being good. Average maximum height attained about 5060ft.; speed moderately fast. Machine landed nicely on lightly-slung chassis, after a good glide. Stability exceedingly good. Following closely upon Vlr. Fletcher were the points gained, respectively, by E. R. Jones and G. O. Partridge, viz., 1575 and i$5'8. Note worthy flights were made by Mr. Hindsley's biplane and Messrs. Rogers' and McBirnie's models—both of which wee,however, smashed. Messrs. Alfred B. E. Cheeseman and B. Brown ably officiated and carried out the judging. Every Saturday has seen a good attendance of members, and of late flying has taken rather a unique form in the way of illuminated flying. Very »ucce»sful flights have been accomplished by M. B. Ross and H. K. Fletcher, with fireworks attached or a small oil lamp. When Hark, such flights are distinctly spectacular- one particularly so, viz., that provided by the continued explosion of a "jumping cracker" in the air. However, this does not in any way interfere with the stability of the model. On Wednesday, 20th inst., B. Brown raised his previous tractor record of 35 sees, to 39 sees. Brighton and District (" KINGSLRIOH," KINGSWAY, HOVE). Monthly Report.—There has not been much outdoor work done during the month. Now that the winter session has started, members spend most of their time in the workshops, and expect to get some good machines out by the new year. The inclination now is to make paper gliders and then to produce larger machines on the same lines ; the Weiss type being much in vogue. A. C. von Wichmann and Kerruish are still experimenting with hydros, and Kermish has some new and very effective floats on his tractor machine; they are a sort of flattened out cylinders with a point each end. The sec. will be pleased to hear of any new members. Note that the subscription of all those joining now will last till the end of 1Q13. Bristol and West of England (Model Section) (3, ROYAI. YORK CRESCENT, CLIFTON). Monthly Report.—No competitions have been held during the month, but a number of new machines have been tested. Self-rising tractor and tail-first models are now in vogue, and hand-launched models are dying a natural death here as elsewhere. R.F.G. models of Messrs. Smallcombe and Martin have flown long distances at heights of 15 and 20 ft. Mr. Stephens' sing e screw model has made short flights, but might do better with larger propelltr, smaller wings, and perhaps gearing ; vide experiments with similar machines by other members. Mr. Howse's "Weiss" type machine made its dfottt by rising and flying 45° ft- a' a height of 20 ft. without any adjustments at all. This model has wings with a heavy camber at the body, damping out towards the tips which are flat and at a slight negative angle. The rear edge of the wings is flexible, and they are brought back as in the Keith-Weiss aviette. The model is of the T-1-1 floating tail type. This machine possesses the extraordinary stability which is associated with rhe Weiss gliders, coupled with unusual efficiency, as it is driven by about one-eighth its weight of elastic and yet has a good reserve of power for climbing. This efficiency may be due to the promotion of a regular flow of air similar to th it over a soaring bird's wing. This method of obtaining stability is apparently superior to the dihedral angle method which involves an undulating flight path and rolling after an encounter with forward and sideways *"*.'*• "I00*1 dubs would do well t > experiment with machines of this type which looks decidedly like the type of the future. 1123
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