[Kars]

To Dave, I just measured from you graph the spread of the fins' times leaving out the two slowest, and I found at 30m depth a difference of about 4 seconds. With the Fisher Power fins at approx 36s touching plate, and with Omer Millenium at 40s. 4 second measured over 40' is to me like a 10% difference.

I think that different fin caracteristics translate to different intensity, different workload and use of different musclegroups. Explaining why we seem to like such a wide range of different caracteristics.

Testing fins going deep is also very diffrent to dynamics in pools.
I think that differences in material become more pronounced going to greater depths.
But Dave's graph can be a good guide for the beginners to show that it's a good idea to start with a medium or soft cheap fin that are durable and comfortable with a good angle. Work on one's muscles, test different blades over a year or two, going deeper, develloping one's own style and then choose a fin matching your personal develloped preferences.

Perhabs Dave you can use the same footpockets and switch blades as you try out what you think is a typical plastic, fibreglas, and carbon blade to 50m dives. A HR monitor recording allong with your divegraph would be intresting. Have good rest between dives, laying your legs high to get rid of any acidation. When you decide to test 3 blade types,
conduct 3 sessions, shifting the order of blades used.

I'm looking very much forward to your dynamic tests, as well as you monofin tests!

Love, Courage and Water,

Kars