The theory behind having more fin config options on your race board.

One think to note, is that since that video was released, the twin set-up suggested for the Blackfish has changed.
It now uses the twins in the bottom right or the top left for the Blackfish (round ones might be a little bit faster on flat).
The top right are used for the Whiplash instead.


Also now the ventral fin not shown in the video has become more important and several people are also riding a single fin plus ventral in certain conditions.

nosaj27 said..
My understanding is that in SUP races anything other than a single fin is illegal in any SUP race, is that still the case???

I am really interested in Larry Allison's 4-fin set-up because I have seen and read so many good things about it but I am reluctant to proceed with the set-up if they aren't legal in SUP races.

There is no Racing Rule on Multiple Fins. Fins with wings are not allowed! Mahalo