[PSUBS-MAILIST] air compensation

[hank pronk via Personal_Submersibles]

 Cliff, I just removed the spring from the first stage regulator to experiment  and  was shocked at the great result of 2 psi or so.Hank
    On Monday, July 31, 2023, 08:00:09 AM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  I understand your description.  I need to check the availably of LP ports on my first stage regulator.  I use one to bring regulated air into the boat for MBT and BIBS.  I should have a spare LP port.  If not, this is not a problem, as I can just put a T fitting in the LP 1/4" SS tubing.  Need to spec a piston style 1st regulator that can get me 2-5 psi over ambient.
Best
    On Monday, July 31, 2023 at 07:23:37 AM CDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  Cliff, you have to keep your existing first stage regulator anyways.  You simple remove one of your low pressure plugs and connect a line to feed the second regulator, witch is the modified first stage.   That is assuming you have not utilized the two extra ports already.  I am not great at explaining, so if it works out I will make a how to video.Hank
    On Sunday, July 30, 2023, 01:18:56 PM MDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  Hank, I did a calculation yesterday as to how much air it would take for the four Minn Kota 101s for a round trip to 300 fsw and back.  The answer was 1.5 SCF for the total (37 fluid oz internal volume in each thruster).  This was less than I expected so I am not feeling so concerned about the R300 HP air supply if I switch back to air compensation.  I have not made this decision yet, but I don't have high hopes that I am going to be able to find an oil that will not be affected by the arcing for these 101s.
Gas leak detection with soapy water works.  Can you send me the make and model of the first stage scuba regulator you are using and the part number for the pressure relief valve you are using?  If I switch back to air compensation, I cannot use the first stage I have because I have need for it at 50 psig above ambient for BIBS and MBT blowing.  I found the previous pressure regulator I used was just too small to handle four thrusters which was how it was plumbed.  It sounds like your regulator might work better.  
I will be interested in your next dive with all four thrusters under air compensation.  Hopefully it will be deeper to give the air compensation system a good test.
Cliff
    On Sunday, July 30, 2023 at 09:36:09 AM CDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Cliff, I am wondering if you can reduce the volume of air inside the motor to reduce air consumption?  Maybe some form fitted plastic inserts between the magnets etc. I have just discovered a nice feature while connecting my rear thrusters to the air compensation  system this morning.  You can pressure test for leaks with your soapy water sprayer. Hank_______________________________________________
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