[PSUBS-MAILIST] window opening

[hank pronk via Personal_Submersibles]

 Hi Jon,Thank you,  the port is conical 14in  OD and 6 in ID and 3 in thick.  The new opening will be 8 inches, so I will just machine the port thinner on the inside. The bearing surface, or conical seat will be shorter also.  This will require some  math to figure out.Hank
    On Friday, July 13, 2018, 6:35:28 PM MDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 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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