Plate XIV is the process that I've been using with the attack disk, based on one of the Angriffsscheibe Handbuch methods. It uses the same formula as plate XIV. The method that Destross wrote about below eliminates the denominator from the formula (for the first method at least - sin(AoB). Don't know if it considers the sin(AoB) negligible as it approaches 1 @ 90°. I love the maths, but don't know how formula from the plate would work and formula from Ausdampfverfahren.
I haven't started looking at the 2nd method (Auswanderungsverfahren) yet.
Do you have charts for those Sjizzle?