[NSRCA-discussion] Rudder pull-pull

[Bob Richards]

--- On Sun, 5/11/08, Lance Van Nostrand <patterndude at tx.rr.com> wrote:
> If you use a shorter servo arm and more servo
> throw the cables will go slack.  The round servo wheel is a
> compromise by offsetting this slack tendency and letting you
> get more servo throw.  It's not a perfect match but it
> can be very close.

It is possible to adjust the geometry so the cables will actually go tighter at the servo is deflected. Simply move the attachment points on the servo arm rearward, so they are slightly behind the center axis.

> Anyone that can do the math on this and present a complete
> answer can get a recommendation to advance from a shade
> tree aerodynamicist to an apprentice.

:-) IMHO, empirical data trumps math and theory. According to the math, bumble-bees can't fly.

Bob R.