Research Notes: Monofin Layer Stack
This note records the monofin layer stack derived from the Bluewater Freediving reference photo and cross-checked with the Predicting Flex technique.
December 2025¶
Research Notes: Monofin Leading Edge
I worked through the research on building a monofin leading edge and I am summarising the notes here. The aim is to replicate the low-drag, factory-style rail on a home-built monofin without special molds or cast urethanes.
Research Notes: Adhesives for Bonding Rubber Rails to Carbon Fins
After a season of pool and open-water sessions both of our documented rail-gluing approaches — Two-part Plastic to Carbon Adhesive and Marine Adhesive — started peeling right where the rails meet the foot pocket hardware. That joint sees the most peel stress when the blades flex, and the bond has been letting go in that exact spot.
The quickest fix has been to wick rubber-toughened cyanoacrylate (CA) under the lifted sections and clamp for a few minutes. That pinning keeps the rails in place for now, but it is still a patch layered on top of a bond that wants to fail.
Project Release: Publishing the Neck Weight Build
The modular neck weight project page is now live. It covers the collar build, the add-on weight modules, and where the supporting techniques live in the lab guide.
If you need the build steps, you can read the full guide here: Neck Weight Project.
Lab Update: Trapped Balloon Vacuum Gauge
We added a short guide to the measuring vacuum section that covers the trapped balloon gauge. The write-up walks through how to size the container, prep the airflow holes, and use the balloon expansion as a quick visual check that a bag has pulled down to around 80% of atmospheric pressure.
If you need a reference while setting up a bag, read the new page here: Trapped Balloon Vacuum Gauge.