[PSUBS-MAILIST] air compensation

[hank pronk via Personal_Submersibles]

 I agree, we should all follow a path that makes sense for our own application to come up with a plug and play reliable motor.  Before I invest a lot of time with magnetic couplers, I want to exhaust the option of air compensation.  I now have all four motors on air and will dive Thursday or Friday to see if the air flow is enough.  Pity the lake is only 60 feet, but the deeper lakes have too many people clogging up the access.  Hank
    On Monday, July 31, 2023, 07:27:43 PM MDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
  Hi Alan, point taken however I’m not convinced oil has been completely discredited yet.  The issues with air is not solely with cost but also with logistics.  Potentially carrying extra tanks and/or investing in a compressor if a dive shop is not readily available.  Our expedition to Lake Tahoe in 2018 was not exactly a remote location however the nearest dive shop for air was over an hour distant from our dive operations.
Assuming an oil or 1-atm solution can be found I’d have a hard time arguing against a “set it and forget it” configuration.  Let’s not forget also that air has its issues.  Cliff flooded a motor using air, Carsten mentioned water ingress with air, and plumbing for air has potential for issues as documented by Stanley.
I see either method as a clear winner which is why I support development of both.
Jon


    On Monday, July 31, 2023 at 05:49:14 PM EDT, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Jon, can you describe a reasonable & cheap oil compensation system?All the commercial units & X navy literature describe an over-pressure system that is not easy to build.I would consider the air used in an air compensation system to be minimal compared with blowing your ballast tanks every dive. Scuba systems seem to have very few failures so, that shouldn't be an issue.Alan
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