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Subsonic said.. I was talking to one of the legends of WA the other day at the beach. He was saying planing gybes were rare back then, not from lack of skill, just the gear made it hard to plane out. He was also saying it was one board, one fin (interesting shapes but no exotic materials).
Planing out was less common, but in slalom I wouldn't have said they were "rare". It depends on who you are talking about, but vids from the '80s surf slalom show that I'm not looking through rose-coloured glasses when I say that the top guys could certainly plane through gybes most of the time.
A lot of the reason they didn't always plane through gybes was because back then "slalom" normally meant surf slalom, meaning the inshore gybe was in water just enough to float the fin (mostly!) and where the wind was light along the beach, and a sail big enough to get you quickly through the whitewater on the way out was likely to be overpowering when you were out the back.
Waveboards were less likely to plane all the way through because they were so small and the sails so flat, and fewer people were doing them because most people were pretty new to the sport.
I just did some flipping between '80s and 2024 slalom vids and the speeds now look a hell of a lot quicker, not surprisingly.