>

A site on Aerodynamics

Translated by BabelFish

Theory
Freins aérodynamiques
Effect of arrow
Différentes formes de profil

To avoid the shock waves on the wing, to delay and attenuate the increase in trail in the transonic zone, the aerodynamicist Lippisch(1942) had the idea to inflect the dattaque edge of the wing backwards.

Effect of arrow

V0 can be to break up according to

  • the tangent at the edge of attack Vt=V0*sin(j)
  • the normal at the edge of attack Vn=V0*cos(j)
The Vn component determines the field of overspeeds. The sweptback wing behaves at the V0 speed as a right wing placed in a current would do it to dair speed Vn=V0*cos(j) (Vn<V0 bus 0< cos(j)<1). [ Thus, to joke, one can say that a plane flies more quickly than these wings ]. Indeed, the supersonic aircrafts show a sweptback wing (delta wing at the hunters). This type of wing shows also some disadvantages:
  • increase stalling speed
  • reduction in the effectiveness of lift increasings (shutters)
  • reduction in the aileron efficiency.
To go to seek Czmax, one is obliged to davoir a strong incidence (A) finally (the last seconds of the landing) and one does not see any more the track! Doù, on certain apparatuses there exist variable arrows like Tornado or F-14 Tomcat of read Navy)

The plane evolves/moves around three axes:
  • rolling
  • lace
  • pitching
Effect of arrow

Three control surfaces:
  • ailerons (rolling)
  • rudders (lace)
  • elevators (pitching)
Orders:
  • handle laterally (rolling)
  • swing bar (lace)
  • before-back handle (pitching)

Tell about this site


©2000-2018 Olivier
All rights reserved
CNIL : 844304

175 messages dans le Livre d'or.
854 commentaires vidéos.
Page générée en 0.006101846694s.
Most users ever online was : 127 on 27 Septembre 2007 à 22:02:33
-- 1 guest --

Version Mobile Tweeter Partagez moi sur Viadeo Partagez moi sur Facebook
FR EN DE IT SP PO NL