[PSUBS-MAILIST] Original MBT vent?

[Jon Wallace via Personal_Submersibles]

 Thanks Rick, that confirms what the drawing is showing.
Jon


    On Thursday, June 10, 2021, 04:44:36 PM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Jon 
sorry I didn't get back to you yesterday. My OD on the hatch groove is 23.75" and 23.25" OD with a just under a 1/4" dia groove, but haven't looked on what the  drawings say. Don't have my O ring to give you that data you wanted.Hope that helps
Rick
On Wed, Jun 9, 2021 at 3:08 PM Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Good to know.  Thanks Rick.
    On Wednesday, June 9, 2021, 08:54:13 PM EDT, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 JonDan Hycroft has been my mentor while building my sub as the captain I think got tired of my calling him for clarification on things due to the plans lacking in various places. I would try him as he is a wealth of information. I stay in touch with him so let me know if you need his number.Rick 

Sent from my iPhone

On Jun 9, 2021, at 10:01 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



I found this K-600 drawing (see attached image) of MBT vent valve dated March 23, 1976.  Rejected I suspect because it brought a water source into the cabin and offered multiple leak points.  The date listed on the drawing is interesting because even going back to the MK-III vessel which predates VAST, I'm seeing the traditional MBT vent valve outside the conning tower with just the valve stem protruding inside.  Was this something he considered an improvement that was rejected by the Norwegians?  Did it vent faster?  George, you left us with many questions.
Jon<mbt-vent.jpg>_______________________________________________
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