[NSRCA-discussion] Rudder

[billglaze]

Correct.  The airplane does NOT know the wind is blowing.  If we were moving in the same direction/velocity the wind is moving, (thus matching the airplane direction/velocity), the airplane would have no vector.
  ----- Original Message ----- 
  From: Terry Beachler 
  To: NSRCA Mailing List 
  Sent: Tuesday, October 09, 2007 2:59 PM
  Subject: Re: [NSRCA-discussion] Rudder



  J & B
  Weather vane implies the wind blowing the tail away from and the nose into the wind which would be desirable for (self)correcting for crosswind. This would imply that an airplane on a cross country flight would self correct into a crosswind, no crab necessary. Or the reverse, pilot would have to hold rudder for a couple of hours on a cross country flight. Talk about a way to induce asymmetrical leg muscles...wow!

  Rudder is used to point the noise into the wind i.e. to induce crab. Full scale pilots make a small coordinated turn into the wind to create crab angle and the desired ground track. I think I read in some pattern stuff that pattern pilots can induce crab and it either presents better to a judge or they can sneak the crab in a way not so easily detected by the judge.  Weathervaning would only happen on the ground with a taildragger, usually the beginning of a ground loop. Or with the airplane on a pylon on the vertical axis, just like a weathervane.

  Crab angle and track apply here. Crosswind acts upon the whole airplane in flight, not just the tail surface. If we turn this whole situation 90 degrees and fly into a headwind and pull up, the airplane would flop over on its back because of the greater exposed surface of the wing area. The wing would have a greater weathervane effect. But it does not work thataway.

  Bob and I have been having fun with this one for a while.

  Terry Beachler

  At 13:01 10/9/2007, you wrote:


    weathervane by cause of wind. If you straighten the plane out to look vertical, the track (actual line drawn) will move with the wind and not be vertical and be cause for a downgrade. Someone has a clip from the rule book covering all parts of this.
     

    Regards,
    Jason
    www.jasonshulman.com
    www.shulmanaviation.com
    www.composite-arf.com 

      -----Original Message-----

      From: nsrca-discussion-bounces at lists.nsrca.org [ mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Terry Beachler

      Sent: Tuesday, October 09, 2007 12:53 PM

      To: NSRCA Mailing List

      Subject: Re: [NSRCA-discussion] Rudder


      Do you mean crab (induce by rudder) or weathervane as if the wind is applying a force upon the tail and causing a turn toward the wind about the vertical axis.


      Terryb


      At 12:10 10/9/2007, you wrote:


        Hi Bob,



        The airplane should weathervane into the wind, as long as the track of the plane is straight (track- actual line/path of the plane). 




        Regards,

        Jason

        www.jasonshulman.com

        www.shulmanaviation.com

        www.composite-arf.com 
          -----Original Message----- 
          From: nsrca-discussion-bounces at lists.nsrca.org [ mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bob Wilson 
          Sent: Tuesday, October 09, 2007 8:53 AM 
          To: nsrca-discussion at lists.nsrca.org 
          Subject: [NSRCA-discussion] Rudder


          Some great ideas. 
          I'm going to give the 60-70% rudder expo a shot and see how it works.

           
          I'd like to do the stall turns on low rate, as Jason reccommends, but when stall turning into the wind my practice airplane will not go vertical (on the downline) unless I have high rates (it weathervanes slightly towards the wind). 

           
          I also liked John Pavlick's recommendation on the two consecutive rolls.  I'm probably being too anal in coordinating rudder, aileron and elevator because I always seem to run out of room.

           
          So much to learn and the damn winter is coming!

           
          Thanks guys,

           
          Bob Wilson


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