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Time to update the rest also then, some qoutes go back to 2009 if you follow the links. I bet technology has improved a bit since then and people changed their opinions ;) Foil kites from that era were indeed shit compared to what we have now, even I have completely converted and don't even own a pu...

That's why you spray the entire foil with primer first. black looks best, but harder to spot if you sanded through the primer or not. Sand through the primer until you start to see the bare fibers abd stop there. Carbon/epoxy doesn't soak up water, so ok to sand down to bare fibers but obviously bes...

This is what the Levitaz and their riders are using, winning almost all the big events last year so they must be doing something right

Also noticed they were using kite race foils with wings in wing races lately, so no big wings or do they use those in lighter winds? Can imagine that the waterstart will be quite challenging on kite race foils, especially in lighter winds.

LE of the profile 2000 grit, middle 1200, TE 800 for least drag.

The reverse for least ventilation on the surface piercing profiles, some even do a single perpendicular pass with even coarser grit just on the first cm of the LE to reduce the ventilation even further.

OVERALL SUMMARY Ram airs collapse and twist on downwind legs of races. Ram airs suck in chop and waves - THEY ARE A FLAT WATER OR LAND KITE (if that). Ram airs cause the rider to fall into the water on the downwind legs. Often you end up with an "expensive pile of fabric getting washing machined in...

LE > TE
Submerged surfaces 2000 - 1200 - 800
Breaching surfaces 800 -1200 - 2000 (top mast, wingtips)
all cross sanded 45deg and use a spraypaint base coat before sanding to fill any imperfections.

Big plans for trying to reach cavitation speeds of 55kn+ ( or did you mean ventilation?)

Did you do any research? Seems like it is a feature rather than a flaw: https://www.iksurfmag.com/reviews/kites/rrd-obsession-mk9-13-5m-2017/ "There is an interesting attachment for the back lines with an extra flap of material between the bungeed pigtail and Leading Edge to keep things neat and red...

It does remind me of this when they go high enough....