fredag 27 juli 2012

AIAA Aircraft Design Confusion

Our New Theory of Flight featured on Secret of Flight has been submitted to AIAA Journal with AIAA "the world's largest technical society dedicated to the global aerospace profession".

Let us study how AIAA expresses its world-leading expertise in the book Aircraft Design: A Conceptual Approach, by D. Raymer, 1992, published in the AIAA Education Series described as "creating a comprehensive library of the established practices in aerospace design" with the following conclusion of the Foreword: "For many years Aircraft Design will be a valuable text book for all who struggle with the fundamentals and intricacies of aircraft design".  We read on p 259:

  • Lift is created by forcing the air that travels over type top of the wing to travel faster than the air which passes under it. This is accomplished by the wing's angle of attack and/or wing camber. The resulting difference in air velocity creates a pressure differential between the upper and lower surfaces of the wing, which produces the lift that supports the aircraft. 
  • All aerodynamic lift and drag forces result from the combination of shear and pressure forces. However, the dozens of classification schemes for aerodynamic forces can create considerable confusion because of overlapping terminology. 
  • For example, the drag of a wing includes forces variously called airfoil profile drag, skin-friction drag, separation drag, parasite drag, camber drag, drag-due-to-lift, wave drag, wave-drag-due-to-lift, interference drag, scrubbing drag, trim drag, induced drag --- and so forth. 

These statements express either self-evident triviality (lift from pressure differential) or a zoo of drag forces beyond rationale. If this is representative of the science of AIAA, our New Theory of Flight will not be understood and well received.

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