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Research Notes: Monofin Foot Pockets

This is the second half of my research — this time looking at monofin foot pockets. Most DIY monofins seem to either use dedicated monofin pockets or just adapt bifin pockets. I want to collect the options here to see which direction makes sense for a DIY build.

Research Notes: Foot Pockets for a Short Carbon Training Fin

I want to build a short carbon bifin for pool and training.
Before cutting any carbon, I need to choose the foot pocket. These notes collect what I’ve learned so far.

The main questions:

  1. Which pockets are most commonly used, and why?
  2. Which ones fit DIY blades without heavy mods?
  3. How much do blade angle and rails matter for short fins?
  4. Where can I find solid references?

Welcome to the ApneaScrap Lab Blog

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We're starting a blog to share progress on DIY freediving gear and testing. Stay tuned for updates.

This space will host:

  • Research notes that capture experiments and the theory behind our DIY projects.
  • Updates on builds, repairs, and anything else happening in the lab.
  • Brainstorming sessions where we think through solutions to tricky problems.
  • Field tests as we take prototypes into the water and report what worked (and what didn't).