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Aviation History
1914
1914 - 1030.PDF
all have a deleterious action on rubber, as well as all oils save castor oil. Redistilled glycerine (if </it tie pure) has but little if any harmful effect; any trace of arsenic or grease left in the glycerine is harmful. The general tendency of the above, as is also the case with bad lubricants, is to reduce, or to tend to reduce, the rubber to a more or less sticky mass. Glycerine, unlike vaseline (a product of petroleum), is not a grease ; it is formed from fats by a process known as saponification, or treatment of the oil with caustic alkali, which decomposes the compound, forming an alkaline stearate (soap), and liberating the glycerine which remains in solution when the soap is separated by throwing in common salt. In order to obtain pure glycerine, the fat can be decomposed by lead oxide, the glycerine remaining in solution and the lead soap or plaster being precipitated. The little gum ticket on the tube of B.G. lubricant does not tell us, by the way, either the price or where it can be obtained. In conclusion, the lubricant is one which we can cordially recommend. Two Oft'Repeated Queries. Quite frequently the following query is sent us:—" I have a model of such and such a span and length, driven by two, or it may be one, propeller of a certain diameter. How many strands of i-in. rubber should I employ to obtain the best results ? " Another very frequent one is : Do carved or bent wood propellers give the better results ? Of course there is no difficulty in answering such questions up to a certain point, especially the latter ; probably there is not sufficient difference between the respective efficiencies of a well-designed bent wood or carved propeller for it to make any very appreciable difference duiing the short time that a model is in actual free flight. Bent wood propellers can generally be rendered lighter than carved ones, and have therefore a slight advantage in this way. Some also maintain that they are stronger weight for weight, and probably this is so j but, on the other hand, they must be very carefully and correctly made to keep their shape. They are also successful only in small sizes, and it is extremely doubtful even if the best ones can be designed on really efficient lines or even correctly balanced. Nevertheless, I believe it is a fact that almost all the model records are held by bent wood propellers. The best advice therefore that one can give is to say : Try both and draw your own conclusions. After all so much depends on the propellers themselves; some can make a propeller of the one type so much better than they can that of the other. With respect to the other query—the factors which enter into the problem are too many to admit of a reply of any real value. Moreover, never has any correspondent given us sufficient particulars of the machine to enable a proper reply to be made. Often not more than three facts are given, sometimes only two. And yet nothing less than the fullest details are of any real use. The best plan is for any aeromodellist to buy, say, J or 4 lb. of the best lubber and keep it in a large air-tight tin, in a cool place, and find out by actual experiment the amount of rubber which will best serve to make his model execute the desired result, so much depends on the design of the model, to say nothing of workmanship and construction. Begin with a small amount of rubber, and gradually increase until the desired end is obtained. Keep it well lubricated. Always remove it from the machine after every series of flights. Use rubber valve tubing over the metal hooks, and refuse all rubber which will not stretch to at least eight times its own length without fracture. ® ® ® ® KITE AND MODEL AEROPLANE ASSOCIATION. Official Notices. British Model Record.. Single screw, hand-launched Duration . T. E. Loach ... 95 sees. Twin screw, do •fR'50*,"0' " r fe0C^ 59o yards. \ Duration ... G. Harden ... 137 sees. Single screw.riM off ground ^R'*?55! ~ ?\rE"iET "' !J°'rards- 1 Duration ... J. K. Louch ... 68 sees. Twin screw, do •fTv?W?Ce ~ V'WI'iStaT ~ 365.yards. I. Duration ... J. E. Louch ... a rnins. 49 sees. Single-tractor screw, hand-/Distance ... C. C. ~ launched ... , Do., off-ground Dutton 266 yards launched ... ..'. ...\ Duration ... J. K. Louch ... 91 sees. I Distance ... C. C. Dutton 190 yards. 94 sees. 35 sees. '" I Duration ... J. E, Louch Singly screw hydro., °«-jDuntioD ... L. H. Slatter Single-tractor, do., do. ... Duration ... C C. Dutton ... 29 sees. Twin screw, do., do. ... Duration ... S. C. Hersom ... 65 sees. Engine driven off grass ... Duration ... D. Stanger ... si sees. Farrow Shield.—Owing to difficulties having arisen with regard to the measurements the result of this competition will he held over until next week. Any communications with regard to models should be sent to H. A. Lyche. 46, Temalesheen Koad, East Sheen, S.W, AFFILIATED MODEL CLUBS DIARY. Club reports of chief work done will be published monthly for the future. Secretaries' reports, to be included, must reach the Editor on the last Monday in each month. Ley tonston t * ad District A.eC( 14, LEYTONSTONK RD. , STRATFORD) OCT. IITH, flying as usual, to o'clock. If wet, meet in clubroom. UNAFFILIATED CLUBS, o. u. _ P,,t and District (66, ELFORT ROAD, HIGHBURY, N.). S- ^"rH^am flVing Meeting on Blackheath, and (weather per- mitting) at the'Lee Aerodrome, 10.30 to » a.m. $ ® ® ® GERMAN SEARCHLIGHTS ^^ FOR AERONAUTS. GERMANY will no doubt possess a very extensive system of high-power signal lights for aeronautical use, and already there are some large-sized searchlights mounted in various places. There is the electric searchlight at the Weimar aviation grounds, of which each flash gives 27,000,000 candle-power. For the use of aviators at a great height there is provided a large light on the top of the Taunus Mountain, at an altitude of 3,000 ft. At present, incan descent lamps give some 500,000 candle-power, but it is intended to use arc light so as to increase this to 50,000,000 candle-power. The revolving light on the top of the wireless mast at the Neustadt station gives four-minute flashes of 300,000 candle-power, using an arc lamp for the purpose. We also note the Berncastel revolving flash, which has 150,000 candle-power. On the Doeberitz military aviation grounds is an acetylene light of 27,000 candle-power, which gives three-minute flashes, while at Kaditz, near Dresden, there is installed an eclipse lamp of 250,000 candle-power, in order to show landing places for aircraft. It gives two flashes in 9 sees. Illuminated numbers of large size are coming into use to show the aircraft headquarters to pilots, and among these is the Johannisthal grounds, which has a number lighted by lamps to the amount of 30,000 candle-power. But larger ones of 85,000 candle-power are mounted at Bonn and at Winiary. Other high-power lights are installed at Konigsberg, Metz, Strasburg and Tegel, and signal lights on the Nauen and Belgerin on the wireless telegraph masts.—Scientific American. ® ® ® © Aeronautical Patents Published. Applied tor In ISIS. Published September 24th, 1914. W. H. NOSWORTHY AND S. J. PEESCOTT. Waterplane floats. W. H. NOSWORTHY AND S. J. PRESCOTT. Hydro-aeroplanes. A. LBIB. Flying machines. A. E., H. L. AND H. O. SHORT. Hydro-aeroplanes. Soc. CITE AEROPLANES HENRY ET MAURICE FARMAN. Hydro-aero planes. PublishedOctober xst, 1914. A. E., H. L. AND H. O. SHORT. Biplanes. Published October ith, 1914. C. LEE AND G. F. T. RICHARDS. Aeroplanes. W. A. WEAVER. I.C. engines for aeroplanes, &c. Flying machines. 12,840. 15,018. «St7J»- 29,206. 29,261. 28,610. 18,154- 22,209. 29,027. A. PEARSE. 1030 FLIGHT. 44, ST. MARTIN'S LANE, LONDON, W.C. Telegraphic address: Truditur, London. Telephone: 1828 Gerrard. SUBSCRIPTION RATES. FLIGHT will be forwarded, post free, at the following rates:— UNITED KINGDOM. ABROAD. s- d. s. d. 3 Months, Post Free... 393 Months, Post Free.„ 5 o ,„ " ,,.-766 „ „ .„ 10 o 12 » » - *5 0 I 12 „ n ... 20 o Cheques and Post Office Orders should be made payable to the Proprietors of FLIGHT, 44, St. Martin's Lane, W.C., W crossed London County and Westminster Bank, otherwise no responsibility wtll be accepted. *• Should any difficulty be experienced in procuring- FLIGHT from local newsvendors, intending readers can obtain each issue direct from the Publishing Office, bv forwarding- remittance as above.
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