I think I answered the topic question
The last 4 tacks on the right (higher wind section) had an mean upwind angle of 31° done in about
15 knts with a Flysurfer Sonic Race 11 m² on 16 m lines and this high AR Monofoil:
http://kiteforum.com/viewtopic.php?f=19 ... 5&start=88
I don't think this is possible with a stabifoil. But for the mono (riding with around 14 knts) it is not the end for sure, as 15 knts wind / 14 riding speed is not a very good rate for upwind angle, if wind is much higher so with a 6 or 7 m² racekite in clean 30 knts without to much waves maybe even up to 25° are possible.
And I also answered for me what all those numbers about performance are worth to talk about:
- with this setup I passed a well known difficult bottleneck, which normaly needs many tacks, this time like nothing with just 3 tacks
- when I first tried boosting I nearly exploded loosing my board by the shock how much it was going upwards
- invented a nice new trick "air tack" transition with a landing far luvwards of the start
- was still able to jump about 4-5 m high when a very experienced friend was no more able to relaunch his foilboarding addicted tubekite ...