BWalnut said..
Pure VMG is one thing, but I don't think that's the main reason to buy a double skin. The double skin is comfort, relaxing over long upwind distances in a wide wind range. Minimal wear and tear on your body as well as allowing your brain to rest and casually sail.
Very true, to make the single skins go upwind well is pretty physical. 1.7km's extra downwinding every 30 mins also sounds good to me😅
There's finally a review up on the Flysurfer Zap,
In French but just auto translate the subtitles. I ordered a 4m largely because the sizing works better for me at my winter ocean spot than the 3.5 or 4.5 PPC would (I think😂). Expensive experiment, even discounted but quite a bit cheaper than the PPC.
Skip to 24:45 for some footage in use. His stow is hilarious...