With the bi-fins, I have been experimenting with the dophin kick, but usually during fun diving, either at the surface, or when I'm cruising at depth, I mostly use a frog-kick that is similar to the kick I used to use on scuba inside shipwrecks. It doesn't take much effort, and it's very efficient. Getting down and up is the scissor or doplhin kick.
I have a monofin from Russia that I bought last year, but it is extremely stiff for sprinting, and is not much use for a gentle kick. The blade would not flex, and I always ended up going sideways in horizontal swimming, or would spin on descent in a deep pool.
Yesterday, moved by the engineering genius of Anderson and Sven, I decided that I would cut out a rounded triangle of material from the back-middle of the fin. It looks more like a whale tail now. I took it to the pool and it worked MUCH better. Now I just need to get some decent footpockets for it.
Cheers,
Erik Y.
