Tell us about yourself!
You did a very neat job hand sewing! Looks professional! I have done this but only in a single layer. Yours looks better.
Buoyancy isn't as important as you think. It just needs to be slightly negative. The important thing is center of gravity, which affects angle of attack, which controls rate of descent. In the instructions I make a big deal of altering the center of gravity in the field to suit by sliding the camera back and forth. The pipes stay sealed and full of air. If you want to experiment with buoyancy, you can bring multiple lengths of pipes, or start long and do some cutting in the field. I haven't tried saltwater, but it shouldn't matter too much. If you find the rig floats in salt, you can just let a little water in, or put a dowel down the center pipe, plenty of fixes for that.
GoPro Underwater GliderView Instructable »
Fast Deploy Paracord Fishta...View Instructable »
Stylish InstaMorph Necklaces
Leather NATO Watch Strap
Harry Potter-Inspired Jewelry
Crabbing Basics for Puget Sound
High Speed Photography
Handy Dandy Hamster Holder
How to Take Light Painting Photograph (With Interesting Affects)
DIY Bluetooth Headphones [Sony MDR-V6 wireless mod]
Lost Your Charger? How to Charge any Battery Survival-Style
Make cool onboard videos on tools: custom mounts & closer focus for Polaroid Cube
The Lathean Hydra: A Multi-Headed Turning Tool from Repurposed Bits
GoPro clamp-mount for multiple angles with one camera (great for cycling!)
Bushcraft, Survival Kit For Extended Durations - Part 1 - Life Support Vest