I fought it, I fought it, but then I got an order for one. So I wrapped my head around the concepts in my own way - mine is not a theory logic.
This is my opinion on what’s going on -
The section between your feet is the part that planes, the engine room, so to speak. Then the tail, behind your back foot determines what you are able do with the resulting speed - variants on the drag that keep you in control…preventing the tail from trying to get in front of the nose. I.e - curve versus straight outline, rocker flip, pulled-in-ness etc.
So then lop off the board after the back foot - you need to employ other aspects of design to keep the speed under control, and you have less space to do it in. Hence the double tipped swallows, rearward and parallel fins, channels…
The straight rail line is already fast - more rail in contact with the wave face means more draw up the face and a corresponding fall-line from further up and steeper.
That straight rail line and area in the nose and tail seem to make it very stable - there’s not the wobbly feeling you sometimes get with direction changes in a curvy outline - I can recover well in turns where I’ve pushed it out of control. It handles a blind falling floater into the trough for example, or a foam rebound.
The pics are my current personal board - I’m 6’4 and 95 kg, 42yo and slowing down heaps with old injuries - this thing has excited me more than a string of recent wide curvy numbers.
I’ll definately make more of them.
JD

dart_one_s by JD_Shape, on Flickr
dart_three_s by JD_Shape, on Flickr
flextail_one_s by JD_Shape, on Flickr
image by JD_Shape, on Flickr
image by JD_Shape, on Flickr
image by JD_Shape, on Flickr