Performance loss versus yaw string deflection

I don't recall ever seeing an estimate of the performance loss in a
glider as a function of yaw string deflection. Does anyone know what it is?

Ultimately, I'm wondering how much attention should be paid to
deflections of, say, 1/8", 1/4", 1/2", etc., on the usual 4"-5" long yaw
string.

I suppose a professionally manufactured and tested yaw string, like the
Mk IV, comes with a performance correction card (much like compass has),
but I just have a blemished one I got an outlet store - no card.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly

* "Transponders in Sailplanes" http://tinyurl.com/y739x4
* Sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org