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aeroegnr said..
I'm curious about the conditions for a strap jibe like that on fin too because most of my experience is in a foil for those. For example: 4.4-5.0 sail and foiling in 20kts when the foil is only doing 10-15kts in the jibe. The sail easily spins downwind as long as you keep carving because there's always apparent wind behind you. Vs jibing in like 10-12kts on a race foil and big 9.0 where it's easy to get backwinded so you step jibe and are careful with sheeting to stay flying and flip.
With fins and strap jibes seems like you'd need a lot of base wind but who knows I'm still a fin jibe struggler.
It's all about your speed relative to the wind speed, and how much speed you loose in the turn. Low board speed, high wind speed, limited speed loss all make sail-first (strap-to-strap) jibes easier. The first place I remember seeing the strap-to-strap jibe a lot was Maui: 30 knot winds, slow wave boards, plenty of swell to help you keep speed in a turn. I sometimes like doing sail-first jibes on flat water when I'm on my lazy (freestyle) gear and got plenty of wind. But sail first jibes are a pretty poor choice if your on gear that lets you go as fast as or faster than the wind. That includes fast foils in light wind, slalom gear, and big fin boards in lighter wind.
The sail rotation requires that you get quite a bit of apparent wind from behind, so you need to be slower than the true wind. The bigger the difference, the faster the sail will rotate, and the faster you get power back in your hands. You can actively make the sail go around faster, but that's a bit more advanced. A smaller sail is easier to rotate neutrally, and won't pull you off balance, like a larger sail may do if you don't level the clew (or do a "boom Shaka") before the rotation.
So basically, play with the sail-first jibe on the fin when you are nicely powered on your small (4.4-5.0) sails. On larger sails, stick to the step jibe.