[PSUBS-MAILIST] Original MBT vent?

[Rick Patton via Personal_Submersibles]

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:
>
>
> Jon
> Dan 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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