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Aviation History
1917
1917 - 0218.PDF
THE "AVRO" PATENT BARRELLESS TURN-BUCKLES. THIS turnbuckle, patented and produced by Messrs. A. V. Roe and Co., Ltd., and sold by the Aircraft Supplies Co., is at the present time being manufactured in two sizes. It has already been approved by the Aeronautical Inspec- tion Department for use for internal bracing in place of other strainers or turnbuckles, where the strength is not less than that required. As will be seen from the table, two strengths of turnbuckles are at present being made, Marks C and D, with a breaking load of 1,216 lbs., and Marks E and F, which fail at 1,950 lbs. The supplies at the present time of Admiralty, A.G.S., and Bluet types of turnbuckles are, as manufacturers know, not nearly equal to the demand, while considerable difficulty is being experienced at the present time particularly in regard Above, one of the double-eye Avro turnbuckles com- plete, and below, one of the fork and eye turnbuckles dissembled. to supplies of the R.A.F. turnbuckles, and more especiallyperhaps A.G.S. 140. It may be mentioned that the Avro Barrelless Turnbuckle comes out at one-third the priceof the Admiralty and R.A.F. types, and is almost equivalent to the price of the Binet type strainers. A number of novel and ingenious features are incorporatedin the Avro Turnbuckle, the following being particularly worthy of note : There is only one threaded shank and no internal threadedbarrel. Hence this turnbuckle can be manufactured in approximately half the time of the standard type. HC PLATE TuRNBUCK L £. Turnbuckle fixing Tank Strap. Two special applications of the Avro barrelless turn-buckle. No Delta metal and no steel bar to R.A.F. specification1 D. are employed in its construction, and since these materials are both very difficult to obtain at the present time, againthe manufacture of this turnbuckle is facilitated, while the elimination of the materials mentioned enables considerablereduction in the cost. All eye-end bodies are ferruled as shown, while those ofthe forked end type are supplied complete with pins and split pins, ready for direct attachment to the bracing lugs. In operation this turnbuckle is extremely simple. Adjust-ment is effected by rotating the nut, which is provided with small flats to take an adjustable spanner or key. A specialAvro key is supplied free of charge with every consignment of turnbuckles. Locking is effected by a locking wire beingpassed through two of the small holes in the nut and around one limb of the body stamping, with which the two free ends MARCH I, 1917- are twisted together. If desired the wire may be led upthrough the eye of the bolt, but in practice this has not been found essential.The Avro barrelless turnbuckle is the lightest turnbuckle extant, yet while fulfilling the ordinary functions is applicableto many special circumstances. By reason of the body being in the form of a stamping, it may be distorted innumerous ways to suit special purposes, and can be apphed for the fixing of the tank strap to a box form body stiffener.In this case a special " T " bolt takes the place of the eye- bolt, while it should be noted that a special long shank boltcan be supplied to adapt these turnbuckles for the adjustment of control cables. N The Avro barrelless turnbuckle has been submitted toexhaustive tests, and while being approved for use on " Avro " machines is also approved by the A.I.D. for internal bracingand other uses, but for which, for the time being, they should be submitted to the A.I.D. in the usual way before beingemployed. At the present time quantities of these turnbuckles arebeing supplied, and the manufacturers are, with the co- operation of other firms, using every endeavour to increasethe output as much as possible. 6.s c.D. E. F. Equivalents. Admiralty type. A.G.S. 252 A.G.S. 252 Nil Nil A.B.C. = R.A.F. type. A.G.S. 140 A.G.S. 140 A.G.S. 141 and 142 A.G.S. 141 and 142 fork and eye Binet type. m.m. 4x44 4x44 S X30 5 X30 4 4 S B m m m m .C Size. .m. .m. .m. .m E. B.C.E. A.B.C. B.C.E. A.B.C. ' O >H met e Di a 6 u in. = double v be cs q lbs. I.2T6 I,2l6 I.9SO I<95° eye. The prices of these turnbuckles may be obtained on appli- cation to the Aircraft Supplies Co., Ltd., 17, John Street, Theobalds Road, W.C., who have been appointed by Messrs. A. V. Roe and Co. as the sole selling agents. H H H H NEW COMPANY REGISTERED. H. E. LATIMER-VOIGHT, LTD., Homeland, Stanmore Road, Stanmore, Middlesex .^—Capital £100, in /i shares. Commercial, aeronautical, carrying and other businesses. First director : H. E. Latimer-Voight. H H H H Aeronautical Patents Published.Applied (or in 1915. Published February 22nd, 1917. • 15,787. CURTISS MOTOR CO. Machines for aerial and nautical navigation. Applied for in 1916. The numbers in brackets axe those under which the specifications will be printed and abridged, &c. Published February 22nd, 1917. 4,319. F. W. BOCK. Self.controlled aerial machine embracing a torpedo andsustaining means therefor. (103,557.) 13 0 H EIndex and Title Page for Vol. VIII. The 8-page Index for Vol. VIII of " Flight "(January to December, 1916) is now ready, and can be obtained from the Publishers, 44, St. Martin'sLane, W.C., Price 6d. per copy, post free. j If you require anything pertaining to aviation, study 1 «' FLIGHT'S " Buyers' Guide and Trade Directory, I which appears in our advertisement pages each week. 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. j s. d. 3 Months, Post Free.. 2 2 j 3 Months, Post Free 3 3 6 „ ,, .. 4 4 j 6 ,, ,,..66 I2 ., ., .. 8 8 j 12 ,, „ .. 13 o Cheques and Post Office Orders should be made payable to theProprietors of " FLIGHT," 44, St. Martin's Lane, W.C., and crossed London County and Westminster Bank, otherwise noresponsibility will be accepted. 218
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