Vertical tail volume coefficients - what am I missing?

[SMORGAN]

The Archaeopteryx foot launched glider has a vertical stab that looks big in comparison to conventional gliders, I guess it is so that the tail boom can be shorter to allow launching without the tail hitting the hill.
Grimace, if you are still watching this thread I would like to see some drawings of what you are proposing. You may also find some relevant info in the thread here on HBA of the Kanja UL glider.

UL SAILPLANE - Footlaunchable, foldable

I will introduce here my design of ultralight sailplane. It is result of my years long dreaming of concept that will suit my wishes. It is result of my flight experiences with Hang Gliding, Sailplane soaring, and evaluating of other footlaunchables, that were caught in my eye by their...

www.homebuiltairplanes.com