[NSRCA-discussion] (no subject)

[george w. kennie]

Ahaaaa ! .................for the first time in all these years I understand the reasoning of my good friend Ron Lockhart with his swimming pool analogy, but,........there's a fly in the ointment !!!!!!!!!!!! 
Someone, maybe Nat, mentioned that air is a fluid. I agree !  Moving air is a CURRENT !  In order for the swimming pool analogy to equate to our situation of flying in a crosswind, the pool would need to be converted into a hot tub with jets located all down one side and exhaust outlets on the other side so that a cross CURRENT could be established (same as the crossing CURRENT we're flying in ) whereupon the swimmer would then be pushed to the exhaust side of the pool. He would certainly feel the force of the current exerting a deleterious effect on his intended swimming direction and would have to compensate and if he was in a boat with a rudder (with forward propulsion) he would aquavane vectorially due to the combined effect of the CURRENT and the forward propulsion. It will not make any difference whether you pick the pool up and move it sideways, fore or aft, turn it around, raise it, or lower it as long as the AC doesn't go out. :>)
Who else,...me 



  ----- Original Message ----- 
  From: Ron Lockhart 
  To: NSRCA Mailing List 
  Sent: Saturday, October 13, 2007 10:46 PM
  Subject: Re: [NSRCA-discussion] (no subject)


  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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