[PSUBS-MAILIST] K-600 has been blasted

[James Frankland via Personal_Submersibles]

Hi Jon,
Looks good.  Big job that by the looks of it.

Great to see it coming together.
Regards
James

On Sun, 2 Apr 2023 at 23:33, Rick Patton via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Isn't there a narrow piece that the lifting eye is connected to? Still
> confused why the hull would be more than one piece? I didn't think about
> Alec's comment about the inside. I hope I never have to do an inside
> blast!😬
>
> Rick
>
> On Sun, Apr 2, 2023 at 12:05 PM Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Well Rick, that's a long story.  The K-600 is just a beefed up K-350 and
>> originally intended to hold one person.  Take out that 2-foot midsection
>> you see in the photo and you can imagine how it originally came out of the
>> factory.  While using the K350 plans was convenient, Kittredge neglected to
>> consider the weight of the thicker hull, tank heads, and ribs of the deeper
>> diving K-600.  When he put it in water the first time it was negatively
>> buoyant and slowly settled on the bottom.  I believe he used thrusters to
>> get him back to the surface, but just barely so.  I remember him telling me
>> that if he had weighed 5 pounds more he wouldn't have made it back to the
>> surface.  He brought it to Bath Iron Works (nice to have connections from
>> his Navy days) and had them cut off the back tank head and add two feet of
>> hull to increase the buoyancy.  So that's why there's a noticeable
>> mid-section "scar" on the K-600.  :) :)
>>
>> Jon
>>
>>
>> On Sunday, April 2, 2023 at 01:47:55 PM EDT, Rick Patton via
>> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>>
>> I didn't realize that the pressure hull was made up of three pieces of
>> rolled plate. Wonder why the aft most piece is so short? Don't think all
>> that heat put into the hull would be a good thing,
>> I had my sub sand blasted in pieces before they were all welded together
>> which made it alot easier. I think the reason I did that was that the hull
>> had been fully welded and then sat for quite a long time while life was
>> happening and the steel might have been hazing due to it being located at
>> my shop which was a block from the salt water. I made an enclosed place to
>> blast it knowing that it would be messy out of 2"X4",s and visqueen but it
>> failed about half way through from the air blasting out of the nozzle..
>> A ton and a half is a lot of sand! Good job Jon.
>>
>> Rick
>>
>>
>>
>>
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