[NSRCA-discussion] (no subject)

[Ron Lockhart]

See comments at end of RJO post.
  ----- Original Message ----- 
  From: rjo626 at aol.com 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Saturday, October 13, 2007 4:55 PM
  Subject: [NSRCA-discussion] (no subject)


  The 010 track
  is caused not by a weathervane effect, but by the body of air moving from
  west to east while airplane progresses
  through it on north heading.

  During this flight, (and in
  Case 1 and 2) a yaw string would be straight, no wind hits side of airplane.

  I'm missing something here. The body of air moving from west to east is 
  not hitting the airplane? Then what makes it go off course? Please explain.
                                 RJO

  Comments-                         
  The airplane is carried along in the west to east movement of the body of air.
  Sort like swiming in north direction in a swimming pool.   And a big giant (wind) picked up the pool
  and carried it in a west to east direction.  You would wind up going west to east, but would not
  have been hit on your west side by water.  You would still be swimming north, so you would travel
  north on account of your swimming (airplane airspeed) and at the same time be carried east by
  by the giant (wind)

  Another way of looking at it - a non powered balloon in the same body of air will be carried in the same west to east direction, and same speed as the wind.   If you were riding in the balloon, you would feel zero wind, cause balloon is not moving in the body of air.  Your direction of movement over the ground will be same direction and speed as the wind.
  If balloon had a yaw string, it would point straight down, same as it would if in no wind air, which means it would not
  be moving over ground.

  This "wind doesn't hit the side of the airplane" discussion ignors gusting wind, random turbulence, etc. that might momentarily "hit" the plane and cause changes in heading, pitch and airspeed.  They are relatively short duration.

  Later, Ron Lockhart


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