[PSUBS-MAILIST] hemi heads

[Keith Gordon via Personal_Submersibles]

Hank - some more Pisces info showing sphere hatch - not detailed but maybe of interest
Cheers
Keith Gordon





On 9/11/2015, at 5:17 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Sean,
> By all means, anyone is welcome to any drawings I obtain or map from the Pisces.    I actually already have material price to machine the hatch from a solid disk of 516-70N  this way it is one piece with no welds.  I just need the drawing first to order the disk.
> Hank
> 
> 
> 
> On Sunday, November 8, 2015 8:52 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I'd be interested in having a look at those drawings.  The idea with a
> conical bearing face on a hatch, if you are not trying to establish a
> metal-to-metal seal, is to provide a load path through the hatch itself
> to carry the shell stress that would otherwise require heavy
> reinforcement around the hole.  Thus, the "ideal" hatch would be the
> same thickness and curvature as the shell it is replacing, aligned to it
> so the load transfers straight through, with a flange on both the hatch
> and shell parts to create a substantial bearing face.  The conical angle
> in that case would be set by the hatch diameter, as the ideal interface
> angle would be perpendicular to the shell at every point.  I suspect
> that in practice, the cone is exaggerated beyond that, because we're
> talking about very small angles on larger spheres - on a PSub, perhaps
> it is more important.  The other advantage is of course the self-centering.
> 
> Sean
> 
> 
> On 2015-11-07 16:26, hank pronk via Personal_Submersibles wrote:
> > Dr Nuytten thinks he has detail drawings that he is willing to share
> > with me, if he can not find them, he has given me permission to measure
> > one of his Pisces in the bone yard.  I may have a look for myself even
> > with drawings, just because I am a visual guy- if I see it I can make
> > it.  Besides, how fun is a day at the Nuytco bone yard :-)
> > Hank 
> 
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