Usually this is the distance between the MAC/4 of the stab and wing.
.........bc ([EMAIL PROTECTED]
http://www.widomaker.com/~conk
Williamsburg, VA 23185
On Wed, 21 Aug 2002, Tom Koszuta wrote:
> Model Aircraft Aerodynamics by Martin Simons has a set of formulas in one of the
>Appendices that allows you to calculate the approximate neutral point and static
>margin of an aircraft. One of the parameters is the "length of the tail arm". It
>does not indicate exactly what this means. I am presuming that it is one of center
>of wing to center of stab, quarter chord line to quarter chord line, or wing TE to
>stab LE.
>
> Can anyone shed some light on this? Alternatively, his example uses a plane
>called a Bantam with a 1.25M span, which he quotes the tail arm to be 0.557M. If
>anyone has one of these and can measure, that would also be appreciated.
>
> I know that I can always start with the most conservative answer and work from
>there, but the engineer in me needs a more exact basis for my calculations.
>
> Tom Koszuta
> Clarence Sailplane Society
> (Buffalo) NY
>
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