[PSUBS-MAILIST] Fw: Elementary 3000 new paint

[Private via Personal_Submersibles]

Very interesting, I had not thought of that. Would the cone not just have to be angled such that its surface were normal to the outer surface of the sphere?

Thanks,

Alec

> On Feb 13, 2016, at 8:45 PM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> At what angle is the interface?  I ask because as the shell compresses,
> that shell stress will act through the interface on the hatch, and at
> some critical angle, will actually act to push the hatch out of the hole
> - at least to the extent that the hull shell deflects / gets smaller
> under pressure.  This is dependent on both the interface angle, the
> friction between the two mating surfaces, and the strength of your hatch
> dogs. Ideally, you want the hatch to lock in place under the stress and
> provide that continuous load path through the hatch dome, instead of
> being pushed outboard by the deflecting shell.  In the latter case, the
> deflection will be minor and probably not represent a sealing problem,
> but it will cause the shell to behave as if it doesn't have that
> continuous load path through the hatch carrying the full shell stress,
> necessitating greater reinforcement around the hole.  That said, your
> hatch land may already be sufficient reinforcement - that's why I was
> hoping for a closer look.
> 
> Sean
> 
>> On 2016-02-13 15:17, hank pronk via Personal_Submersibles wrote:
>> Sean,
>> Yes the hatch and seat are conical.  The hatch dome is in line with the
>> hull so the load path is a smooth line.  
>> Hank
> 
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