[PSUBS-MAILIST] window opening

[Jon Wallace via Personal_Submersibles]

Hank, this is a flat disc port?  If so, it doesn’t fit typical recommended configuration by Stachiw which is OD = ID * 1.25

I have to assume that such a large OD/ID ratio as you have described was used to increase depth capability without getting into a more expensive conical or spherical segment configuration.  I dont have access to stachiws book right now to see if he has a calculation based upon the ratio.  If nobody answers sooner I’ll look it up Sunday evening when I return home. 

Jon


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On Fri, 7/13/18, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] window opening
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Date: Friday, July 13, 2018, 7:09 PM
 
 Hi All,I need
 help to figure out the depth rating of my port in E3000.
  Right now it is a copy of a  P6 port at 14 inches
 od and 6 in ID and 3 inches thick.  I want to open the
 port frame up to 8 inches ID from 6 inches ID.  The
 thickness of the port will reduce by about 1\4 inch.
  I need to know how much this will impact the depth
 rating.Hank_______________________________________________
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