[PSUBS-MAILIST] Fw: Elementary 3000 new paint

[Sean T. Stevenson via Personal_Submersibles]

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