[PSUBS-MAILIST] Fw: Elementary 3000 new paint

[hank pronk via Personal_Submersibles]

The 15 degrees is off vertical.  So imagine a vertical line from top to bottom of the centre of the sphere. Then the angle is 15 degrees off that vertical line.  The angle could be a pinch more maybe 17 degrees or so.  I had a hard time reaching it to measure with the ballast tank in my way.Hank 

    On Sunday, February 14, 2016 12:45 PM, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 I thought the idea with conical hatches on spheres was to have the angle of
intersection perpendicular to the surface.  i.e. the cone apex being the
centre of the sphere. Hank, Is the 15 degree angle 30 degrees inclusive, 15
degrees inclusive or 15 degrees from the line from sphere centre to hatch
joint??  Hugh  


-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Sean T. Stevenson via Personal_Submersibles
Sent: Sunday, 14 February 2016 2:45 p.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] Fw: Elementary 3000 new paint

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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