Jalani, your description of twist is a correct one.

It was I who messed it up wanting to calculate how much twist 250mm would be on an A-cat expressed as an percentage. The reason I wanted to do this earlier, was to get an idea about how hard he sheeted his sail as compared to the amount of twist designed into the sail..


While I have your attention. In the picture you posted earlier on, of you going upwind with bit-time twist. Is your boom bending noticabely, causing the foot of your main to be very deep?
It's hard to tell from the picture, but how much is your mast bending? It looks fairly straight, even with what I guess is quite high sheet tension.
You also seem to have a carbon mast, how sensite is it to downhaul compared to an alu section?

Would be nice (and relevant to the thread) to hear your opinions on this.