[NSRCA-discussion] Rudder

[Terry Beachler]

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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