[PSUBS-MAILIST] VBT
hank pronk via Personal_Submersibles
personal_submersibles at psubs.org
Sun May 19 12:51:06 EDT 2019
Hi All, Did you guys know that Nekton subs were built with a VBT'? I put one in today because I have a job next weekend to video a sewer outfall in Kootenay Lake that starts shallow and goes to 200 feet deep . It would be tricky to follow the pipe precisely if I had to also maintain neutral buoyancy as well as stay on coarse. My VBT is plumbed into the original VBT ports with a fill valve at the bottom of the tank witch is an aluminum CO2 tank. There is a tee at the top of the tank with a vent valve and an air pressure line that comes from a regulator. To fill I just let the water flood in the bottom of the tank. To remove the water I close the vent valve and pressurize the tank. I can let a little water out or a lot by simply opening the fill valve. If it works out and I like having it I can install a hand pump for fine control.
I also installed a new propeller with more pitch a more square blades to help with speed and reverse. This propeller is amazing in reverse.
Tuesday I will test this out plus a sample system for collecting sediment Hank
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