Transactions Volume 12, PT. 1
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Transactions Volume 12, PT. 1

Transactions Volume 12, PT. 1


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...will be only about 100 (ViT--1) = 20 per cent, or the air-resistance will be reduced by about 2--2 100 ( )--40 per cent. The weights being proportional to the squares of the thickness, the gain in weight of struts of a single lift-truss against a double lift-truss will be about 2--V2 100 ( ) = 30 per cent. 2. The diameters of wires or cables vary as the square root of the load that the wire or cable can stand. For the double load of one single lift-truss cable against two cables of the double lift-truss, the increase of diameter and therefore of the air-resistance will be about 100 (V2--1)--40 per cent, or the air-resistance will be reduced by about 2--V2 100 ( ) =30 per cent. There is no gain in weight however in this case. 3. The larger-size wires and cables of a single lift-truss system allow a further gain in reduction of air resistance by using streamline wires or cables. The latter are made of stream-line form by means of sharp specially-attached trailing edges, which might be impracticable on the small cables of the double lift-truss system. 4. In the double lift-truss system the forces acting on each truss depend upon the position of the center of pressure; at fast flight and a small angle of incidence, the rear truss carries a greater part of the total load--roughly speaking between two-thirds and three-fourths of the total (see Fig. 37). At slow flight and large angle of incidence the reverse is the case (Fig. 36). Thus considering the two extreme attitudes, each of the trusses is either partly idle or has an extra strength and therefore weight. In the single lift-truss the forces acting on the truss are almost independent of the center of pressure, as the reaction of the load at the root of the cantilever is equal to the load and independe...


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Product Details
  • ISBN-13: 9781152076709
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 160
  • Spine Width: 9 mm
  • Width: 189 mm
  • ISBN-10: 1152076701
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 299 gr


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