[NSRCA-discussion] Weather Vane or Crab

[Del K. Rykert]

But.. but ..  buttt.. I need 2 beers @ least.. grins 
 
    Del

----- Original Message ----- 
From: "Ron Lockhart" <ronlock at comcast.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, October 13, 2007 9:16 AM
Subject: Re: [NSRCA-discussion] Weather Vane or Crab


> I'll try "crab" discussion and application.
> 
> If a pilot is flying to a specific point and points a trimmed airplane
> directly at that point, and there is no wind,
> the airplane should get to that point.   (Durring that flight, airplane
> heading and track are the same.
> There will be no wind hitting side of plane.  A yaw string on nose will be
> straight down fuse)
> 
> I suspect were all in agreement so far....
> 
> If a pilot is flying to a specific point and points a trimmed airplane
> directly at that point, and there is wind
> somwhat perpendicular to the intended flight track over the ground the
> airplane will not get to that point.
> The airplane will get to a point down wind of the intended point.  (During
> that flight, airplane heading and
> track will not be the same.  There will be no wind hitting side of plane.  A
> yaw string on nose will be
> straight down fuse)     I suppose we just lost a few folks here....
> (sigh)
> 
> The pilot could chose to fly a heading that is not directly pointed at the
> intended point.  The pilot could
> choose a heading a few degrees toward (into) the wind.  If the number of
> degrees is chosen (or calculated
> on the basis of accurate airplane airspeed and wind speed) correctly the
> airplane will get to the point.
> (During that flight, airplane heading and track will not be the same.  There
> will be no wind hitting side of plane.
> A yaw string on nose will be straight down fuse)
> 
> The difference between the no wind heading to the point, and the heading
> chosen by the pilot to compensate
> for the wind is called crab angle.   The crab angle has compested for the
> movement of the body of air the
> airplane is flying in, while it flew toward a specific point.  The crab
> angle concept applies to full scale flight in
> everyday navigation to destination, and also applies to getting from over
> the right pole, to over the left pole
> in a cross wind.
> 
> All this would be a bunch easier with a white board and beer.  <VBG>
> 
> Later,  Ron Lockhart
> 
> 
> ----- Original Message ----- 
> From: "Ken Thompson" <mrandmrst at comcast.net>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Saturday, October 13, 2007 12:48 AM
> Subject: Re: [NSRCA-discussion] Weather Vane
> 
> 
>> Jim and all,
>>
>> Most of us realize the plane will do as you and others have described, my
>> only point in questioning this is...is it called "weathervaning" while
> it's
>> in the air, or is it called "wind induced yaw or crab"?
>>
>> Best to you in your recovery.
>>
>> Ken
>>
>> ----- Original Message ----- 
>> From: "James Oddino" <joddino at socal.rr.com>
>> To: <alberji at charter.net>; "NSRCA Mailing List"
>> <nsrca-discussion at lists.nsrca.org>
>> Sent: Friday, October 12, 2007 7:14 PM
>> Subject: Re: [NSRCA-discussion] Weather Vane
>>
>>
>>   If it does, this is my
>> > definition of weathervaning.
>> >
>> > I'm recovering from an emergency appendectomy so I'm depending on all
>> > you other guys to go try a cross wind stall turn with no rudder
>> > command tomorrow and report on your results.
>> >
>> > Best Regards, Jim O
>>
>>
>>
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> 
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