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Principles and Design of Aeroplanes

Principles and Design of Aeroplanes


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... CHAPTER X. Other Types. So much has been said about the aeroplane that the possible importance of other types has been to a great extent overlooked. Many men who are considered experts have pronounced in favor of the helicoptere, and still more have pinned their faith on the birdlike machine, or ornithoptere. Before dogmatizing on the subject a very careful consideration of the pros and cons is necessary. Let us take the ornithoptere first. Its disadvantages are: 1. Complexity of mechanism. 2. Downthrust on the hack stroke of the wings, unless their plane coincides with the direction of relative motion. 3. Balancing difficulties. 4. Paucity of thrust at low speeds. 5. Periodic variation in the lift and thrust, which reduces the average value of both and may tend to cause oscillation. It is only recently that the flight of birds has been at all well understood, and its success is now seen to depend on a far closer correspondence to environment than was previously suspected. Professor Marey has shown by photography and electrical apparatus that, during one up-and-down beat of the wing, the wing is twisted from an upward slope (at commencement of downstroke) to a downward slope (at end of downstroke) and again to an upward slope during the upstroke (the slope increasing to a maximum at the middle of the upstroke). The wing is only horizontal near the lowest point of the stroke. There are thus the following motions of the wing planes during one period: 1. Forward motion with body. 2. Revolution of tip of wing in a roughly circular path (i.e., as compared with the body, or cycloidal as compared with the air). 3. Torsion of the wing plane, amounting to about 60 on the downstroke and 45 on the upstroke. The upstroke is generally..."


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Product Details
  • ISBN-13: 9781151033505
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1151033502
  • Publisher Date: 20 May 2014
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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