JD-EE
The Hinge Line is the pivot edge of the Rudder. The Hinge Plane, is the Sweep of the Rudder. The rule is for the Plane, the Tail Strike is what is assumed by me to be the design consideration of the Arm. Someone is confused, it may well be me at this point, but I will still say that BEA got it wrong if Plane is what they meant to demonstrate. You are correct if tail strike is what you are saying also.
mm43
Noted, and thanks.
bear