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Elementary Principles of Aeroplane Design and Construction; A Textbook for Students, Draughtsmen and Engineers

Elementary Principles of Aeroplane Design and Construction; A Textbook for Students, Draughtsmen and Engineers


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About the Book

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. 1919 Excerpt: ... in greater proportions for larger angles of incidence. The figures given in Table VIII. enable corrections to be made to the lift coefficients and lift/drift ratios of single aerofoils for different biplane spacings, and is based upon the results of N.P.L. tests. Table VIII.--Corrections For Biplane Spacing. The best arrangement of biplane spacing is largely a matter for practical consideration, for although both the lift and the efficiency increase as the gap is increased, yet the increase in the weight and resistance of the extra length of struts and cables generally counterbalances these gains after a spacing of gap equal to the chord is reached. In the triplane system the lift of middle plane is interfered with upon both sides, and of the lower plane upon its upper side. Experiments show that at angles of incidence of from 2 degrees to 12 degrees the lift and lift/drift are less than the corresponding values for the biplane. At angles of about 16 degrees the tri Single aerofoil coefficients are multiplied by the numbers given for biplane spacing coefficients. plane has very nearly the same lift, and a rather lower resistance coefficient. The following table shows the Biplane and Triplane Correction Coefficients for the R.A.F. No. 6wing, with a spacing equal to 1-2 times the chord, and with no stagger. EFFECT OF STAGGERING. The effect of staggering the top plane forward is to improve the lift coefficient and the lift/drift ratio. When the top plane is staggered forwards through a distance equal to about twofifths of the chord, the lift and lift/drift are both increased by about 5 per cent. This improvement is equivalent to that which would accrue if the biplane spacing were increased from i-o to 1-25 of the chord. If the top plane be staggered backwards...


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Product Details
  • ISBN-13: 9781231954638
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 34
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1231954639
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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