[PSUBS-MAILIST] Acrylic & distortion

[Joe Perkel]

Very basic Alan. I was thinking along the lines of flat slabs like Nekton.

Joe


On Jan 13, 2014, at 10:25 PM, Alan James <alanlindsayjames at yahoo.com> wrote:

> Hi Joe,
> it is do-able if you stick to a basic shape. 
> You could blow 2 ellipticle hemispheres & join them at the flanges &
> mount them under a frame that extends from the hull.
> Greg's the best person for advice on this.
> Alan
> 
> From: Joe Perkel <josephperkel at yahoo.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Tuesday, January 14, 2014 4:02 PM
> Subject: Re: [PSUBS-MAILIST] Acrylic & distortion
> 
> Alan,
> 
> I don't have that text yet, every time I think to buy one I get a weeks worth of groceries instead! :)
> 
>  Joe
> 
> On Jan 13, 2014, at 7:53 PM, Alan <alanlindsayjames at yahoo.com> wrote:
> 
> 
> Joe,
> if you look in the Stachiw book on acrylic you'll see that light is distorted
> as it moves through acrylic, & the longer it travels through it the more distortion.
> So looking straight through a thin section, not so bad, but looking through 
> the curves formed in an object made of acrylic would give more distortion.
> The impact resistance would be a problem for a ballast tank. When 
> forming a rounded shape from acrylic there is a thinning at the apex. 
> For a blown hemisphere dome the thickness at the apex is about a 3rd of the 
> original sheet thickness. So you would have to start with a relatively thick sheet.
> You would have to connect it to the hull, & this would be a problem as these
> connections would be stress points that could produce cracking.
> Hope that's thrown cold water on the idea. (sorry can't find smiley button on ipad)
> Alan
> 
> Sent from my iPad
> 
> On 14/01/2014, at 1:05 pm, hank pronk <hanker_20032000 at yahoo.ca> wrote:
> 
>> Joe,
>> If the acrylic is wet on both sides it disappears. 
>> Hank
>> 
>> 
>> On Monday, January 13, 2014 4:52:33 PM, Joe Perkel <josephperkel at yahoo.com> wrote:
>> What can I get away with as far as transparent see thru panels and not horribly distort the visual field?
>> 
>> For example, large transparent panels that double as MBT shell. Any rules of thumb, curvature direction, compound curves vs developable surfaces, etc?
>> 
>> Joe
>> 
>> Sent from Yahoo Mail for iPad
>> 
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> 
>> 
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> _______________________________________________
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> 
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140113/0724c8fa/attachment.html>