Aviation and Aeronautical Engineering Volume 8

Aviation and Aeronautical Engineering Volume 8

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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. 1920 edition. Excerpt: ... disturbing the functions of the ailerons is shown in Fig. 6. In some British experiments carried out on an R.A.F.9 wing section with the hinged rear portion occurring at 0.385 of the chord, the maximum lift, obtainable was increased in the ratio of 1.35 to 1, the flap being set at 60 deg. to the wing. This maximum lift occurs when the angle of incidence of the wing proper is in the neighborhood of 4 to 6 deg. Such an increase in the maximum lift would decrease the landing speed in the ratio of 1 to 0.865 If the flap were used intelligently by the pilot, it could be used effectively as a brake, 'after the machine had settled at a speed and attitude corresponding to the maximum lift, by being set at a maximum pitch of 90 deg. to the wing, with the wing itself at an attitude corresponding to the three-point landing. Even when the flap was only set at a 45-deg. positive angle to the wing, the drift of the R.A.F.9 at 14 deg. was increased in the ratio of 5.45 to 1. If the mechanism were applied to the Curtiss R-4-L machine and used as already explained, with flap set at a positive 60deg. angle for landing and a positive 90-deg. angle for braking, the landing speed would become 45 m.p.h. and the landing run would be reduced to about 200 ft., as compared with the 750 ft. previously computed. A definite conclusion would be that wing flaps extending along the rear edge would be of very appreciable help. It is very often assumed that a variable-pitch propeller will decrease the landing speed by imposing a large negative thrust on the airplane in the dive. A short consideration of the problem will indicate that this conception is erroneous. For small angles of glide the effect of a negative propeller thrust will be simply to increase the angle of glide for...show more

Product details

  • Paperback | 228 pages
  • 189 x 246 x 12mm | 413g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236501047
  • 9781236501042