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Aviation History
1913
1913 - 0451.PDF
APRIL 26, 1913. increase of tnras, and so a longer distance or duration than in the case of the two-propeller machine. In the model referred to all the propellers were of the same pitch, being four of Bonn's 9 in. diameter " Invincible " carved propellers; the four, with axle and honks, weigh under I ox. Now, since the two rear propellers are •lilfciiw in the slip-stream of the two " tractors," they should, no doubt (to obtain a better efficiency), have a somewhat coarser pitch. The four propellers together form two A-cau weights on an arm 3 ft. long. l/jjCHf] Ru&Urr t»4 ^Witti a*Jr SHOCK-ABSORBER The shock-absorber on the Stanger petrol-driven model. thereby giving rise to a somewhat large moment of inertia attout the central lateral axis ; the propellers must also be caused to respectively rotate so as to avoid any gyroscopic action. The design of the machine is such as to offer a minimum increase of both weight and head resistance for the object aimed at. The principle is obviously one that cm be applied to either a self launching model on wheels or a hand-launched model. In Ixrth these latter cases the proportionate increase of weight would be less, because in the case of the r.o.g. machine the increase in the weight of the altered chassis need be but little, possibly none at all, and in the case of the hand-launched model no such factor comes into play. We have not yet submitted the model to any crucial tests for duration further than to ascertain that such a model can be made to fly successfully. It should be noted that the case of the hydro aeroplane is the least advantageous one owing to the greater pro portionate increase in weight. In building such a model straight away, and not converting it, one would, of course, use only two (slightly larger) floats instead of three, and save a little weight in consequence, also some head resistance, &C. "Flight" Model Supplement. A correspondent writes: " I see in this week's FLIGHT that the model supplement of the Olympia Show may have to be abandoned. I hope under the circumstances that this will not take place. There are hundreds of aeromodellists who, like myself, have no club in our vicinity, and who highly value your instructive and interesting articles in the Model Section. I hope that you will therefore find it possible to publish a supplement; I am sure it will be the means of attracting more readers." As we stated a fortnight ago, the matter is not one that rests with us at all. The Editor at once most kindly acceded to the proposal; the onus, if there be any in the matter, rests entirely with those who could supply the necessary information, but, it would appear, prefer not to do so. As already stated, all those who have so far kindly supplied particulars will be dealt with in this section ; this will of course take some time, as they must be worked in as occasion permits, but even- endeavour will be made to supply some item weekly until finished. The Twining Aeroplane Co.'s Catalogue. We have received from the above one of their catalogues, the most interesting feature of which, from the ordinary aeromodellist's point ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Record*. _ .. , , f Distance ... A. E. Woollard ... 477 yards. Handdaonched ... Domtion ... A. F. Houlberg ^ 89 m __ . f Distance ... G. Rowlands 932 yard*. Off ground 1 Duration ~ A. F. Hoolberg ... 51 sees. Hydro, off water ... Duration ... G. P. Bragg-Smith .„ »J «ect. Single-tractor screw, (Distance ™ F. G. Hindsley ... 173 yards. hand-launched ... I Duration ... T. E. Louch 44 sec*. Do., off ground Duration ... J. E. Louch 40 fees. Affiliation.—An application for affiliation has been received from the llendon and District M odel Aero Club. o» view, pobably is their parcels of wot king drawing- and materials for building models ; no less than as such patcels are quoted, all at an extremely moderate figure, and contain among them many oi the best-known rubber.iiiven thing model- ol the pie»rni d»v. The catalogue also contains a price list of the usual model accessories. such as woods, rubber, lubricants, wire strainers, wite, Iwaring*, aluminium disc wheels, winders, Sea,, \c. No acromodelhsi should be without one of these catalogues. We have personally MM many of the models made by tins firm in actual flight, and wears sure that if the instructions given in the M paresis " are only carried out with reasonable care, the purchaser will have every reason to be full satisfied with his bargain. The awards won by (his litm arc among the liest, and their number is many. Referring to the subject of winders, the above firm supply a special form of double-geared winder, somewhat resembling an egg- beater, designed by Mi. Twining, by which !>oih ruhlier motors are wound at the same time from tk< itont of the machine. The The nose of the Houlberg model, showing (in, protector, and one of the twin-winding hooks and catch. illustration which we give this week of the no*e of the Houlberg model, showing one hook and one skein of rublwr, should make this clear, the upright catch of the hook portion being pulled forwards and outwards laterally when winding, and released and allowed to go back when wound; the- othei hook and catch is similarly dealt with at the same time. We have always been much surprised that this system has not come into more general use, it possesses so many advantages, both rubbers being wound up at Hir same time, and always to an equal amount, and in less than half the time, and far less undue strains imparted to the machine. Wind Gusts uersua Models. A really extraordinary spectacle was afforded on Saturday after noon last in the scratch competition for a gold and silver medal (with gold centte) which took place on the Croydon football ground—one of the most unsuitable places that could possibly lie chosen from an aeromodellist's point of view. From a spectator's point of view- more especially if the spectator happened to know something ol aeronautics—the sight was full of interest, not to say instruction. Surrounded on one side by a railway emlwnkmeni (over which a strong and gusty wind was blowing), on another side by a grand stand, and on the third by a bank and building, it was something like trying to fly in a deep saucer or the crater of an extinct volcano. The competition was for hand-launched models, but even the invincible A frame twin-profiler machine—which on open ground can hold its owi., more or less, even against a gale- had to own itself licaten, and out of some fifty flights not one reached a duration of 40 sees. There was one particular portion of the ground which, as soon as any model reached it, no matter how well (or ill) it was flying, was immediately fatal to it, and tumbled it over for all the world like a shot partridge. We have seen many hundreds—thousands probably—of model flights, but never any thing quite equal to it. The winning model, during three out of its four flights, at one time pointed straight up in the air for several seconds, then flew upside down for some time, then righted itself and went on flying as if such was its usual method of procedure. Chevillard's chute di ettt is indeed wonderful —to use BO stronger term s but even Chevillard has to take t back seat when confronted with the "stunts" which we witnessed in model form on Saturday last! Competition,—Tbescraicb competition for prize*, presented by < l,T., Ltd place on the Croydon Cunimun Football Ground, on Saturday, April Jutb. Ttw result wai : 1st, F. fannaway, 35 secs.j who look the SjDtld medal ; mil, ) 1 Louch, of the Nonh-Kasl London Ae, Club, 311 sees., taking silver medal judges were Messrs. V, E. MfeaatSfc V. PVsSfSnf SM W. H. Akeburst. performances were good, taking into account the gusty wind and the downward winds that were encountered on the ground, this being demonstrated when Capt. Penfold made his balloon ascent and parachute descent, which, in triad, was a plucky display, and one of the finest seen in such a wind. Hydro. Trial*—These take place to-day (Saturday), aoili, on the UusboMre Pond, Wimbledon Common, at 3 o'clock. Programme of Competitions.— The programme for the year is in coarse of preparation and will shortly go to press, the rules committees having been busily drawing up the rules, which will be more scientific than last year. 27, Victory Road, Wimbledon,S.W. W. H. AKKHURST, Hon. Sec. 473
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