The discussion in this thread Pathos Fireblade and Salvimar 4One reviews... prompted me to put together fins with foot pockets that don't have tendons. This was my intial post.
So I decided to bring this thing to life, introducing the Speardiver "freeblades" I cut the tendons off H Dessault foot pockets and reshaped them. I figured the blade will need more support from the bottom so I shaped a piece of starboard. It doesn't feel much different than a blade in Pathos foot pockets. It will feel different once the water channeling rails are on. I'll try it and post back. Xan, you're welcome to try them.
BTW if there's a fiberglass blade that can handle that kind of stress it's this one. If it breaks at the toe there's no usable blade in existence that will bear it.
I finally got around to trying them. I really like the action, nice and soft. The footpockets are comfortable and the fins are light. I'd use the metaphor of a roomy comfortable Cadillac (these fiberglass fins) versus a cramped sports car (carbons in Pathos foot pockets).
hau also tried them and I made a vid so you can see the action of the fins. In the video I say he's moving faster, I'm making a comparison to the omer ice fins that he brought. I also made one of the fins with water channeling rails and the other without for comparison. I already knew this but it was nice to see again the water channeling rails doing their job. The fin without the rails would lose control and do a quick wobble right at the end of the stroke.