Originally Posted by
vivo quevas
It is the kick up in the back, it has to be cut down to 10mm and the rules my club uses 15mm on the up side of the side damms.
I imagine this what the wing rule was supposed to refer too but it is not wing chord. Wing chord is the distance from the leading edge of the wing to the trailing edge.
http://wright.nasa.gov/airplane/geom.html
Maybe Rob k can clear up any confusion on what the rule means.