Simonspear.. you won't be sorry with the elios.. that's for sure.
John, I mean efficiency as to distance traveled vs. oxygen used... In my tests, I figured that speed would translate to efficiency but not the efficiency that I was looking for in freediving where speed is not the factor... but rather what fin will take you the farthest on the least amount of oxygen... Jim was able to sort of calculate this in his tests by how much air he used out of a tank on a series of runs.. but all the factors associated with freediving, i.e. kick style, breath up, rest, hydronation, etc., etc.. wouldn't allow me to reach any kind of of conclusion...except my conclusion had to be just what fin gets me to the bottom and back and does it the best for me...meaning, when I get back to the surface, which fin allows me to go to depth and still arrive comfortably at the top? For me it's the mono first, the sporasub pures second, and the cressi hf2000 a close third... after that, with the fins I have, the sporasub cruises (mares avanti quattro pro's) and several other long fins are very close, and the rest, mostly shorter fins of all sorts, fall far behind. This does however coincide very closely with my underwater speed tests. Now... can we talk what I found out about split fins?... although they all were worse than any other fin I tried.. there was one set I borrowed from Jim Grier that surprised me.. not that they were so fast... but that they were so much faster than any other split fin I tried that day.. I just can't remember what they were.... shoot.