[PSUBS-MAILIST] Fwd: hemi heads

[Keith Gordon via Personal_Submersibles]

As discussed Hank have removed one image to reduce to 418 KB - will see how this goes
Keith 

Begin forwarded message:

> From: Keith Gordon <searov at xtra.co.nz>
> Subject: Re: [PSUBS-MAILIST] hemi heads
> Date: 9 November 2015 9:34:32 AM NZDT
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> 
> Hi Hank
> 
> Maybe of interest - I have attached some pix of Pisces 8 without her clothes on - 
> 
> 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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>> 
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