<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:14pt"><div><span>Hi Joe,</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>it is do-able if you stick to a basic shape. </span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span>You could blow 2 ellipticle hemispheres & join them at the flanges &</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent;
font-style: normal;"><span>mount them under a frame that extends from the hull.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="background-color: transparent;">Greg's the best person for advice on this.</span></div><div style="color: rgb(0, 0, 0); font-size: 18.88888931274414px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="background-color: transparent;">Alan</span><br></div><div><br></div> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 14pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <hr
size="1"> <font size="2" face="Arial"> <b><span style="font-weight:bold;">From:</span></b> Joe Perkel <josephperkel@yahoo.com><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, January 14, 2014 4:02 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Acrylic & distortion<br> </font> </div> <div class="y_msg_container"><br><div id="yiv6843622253"><div><div>Alan,</div><div><br clear="none"></div><div>I don't have that text yet, every time I think to buy one I get a weeks worth of groceries instead! :)</div><div><br clear="none"></div><div> Joe</div><div class="yiv6843622253yqt3045977133" id="yiv6843622253yqt46566"><div><br clear="none">On Jan 13, 2014, at 7:53 PM, Alan <<a rel="nofollow" shape="rect" ymailto="mailto:alanlindsayjames@yahoo.com"
target="_blank" href="mailto:alanlindsayjames@yahoo.com">alanlindsayjames@yahoo.com</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div></div><div><div class="yiv6843622253yqt3045977133" id="yiv6843622253yqt73155"><div>Joe,</div><div>if you look in the Stachiw book on acrylic you'll see that light is distorted</div><div>as it moves through acrylic, & the longer it travels through it the more distortion.</div><div>So looking straight through a thin section, not so bad, but looking through </div><div>the curves formed in an object made of acrylic would give more distortion.</div><div>The impact resistance would be a problem for a ballast tank. When </div><div>forming a rounded shape from acrylic there is a thinning at the apex. </div><div>For a blown hemisphere dome the thickness at the apex is about a 3rd of the </div><div>original sheet thickness. So you would have to start
with a relatively thick sheet.</div><div>You would have to connect it to the hull, & this would be a problem as these</div><div>connections would be stress points that could produce cracking.</div><div>Hope that's thrown cold water on the idea. (sorry can't find smiley button on ipad)</div><div>Alan</div><div><br clear="none">Sent from my iPad</div><div><br clear="none">On 14/01/2014, at 1:05 pm, hank pronk <<a rel="nofollow" shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca" target="_blank" href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"><div><span>Joe,</span></div><div><span>If the acrylic is wet on both sides it
disappears. </span></div><div><span>Hank</span></div><div class="yiv6843622253yahoo_quoted" style="display: block;"> <br clear="none"> <br clear="none"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div style="font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> On Monday, January 13, 2014 4:52:33 PM, Joe Perkel <<a rel="nofollow" shape="rect" ymailto="mailto:josephperkel@yahoo.com" target="_blank" href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>> wrote:<br clear="none"> </font> </div> <div class="yiv6843622253y_msg_container"><div id="yiv6843622253"><table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td colspan="1" rowspan="1" valign="top">What can I get away with as far as transparent see thru panels and not horribly
distort the visual field?<br clear="none"><br clear="none">For example, large transparent panels that double as MBT shell. Any rules of thumb, curvature direction, compound curves vs developable surfaces, etc?<br clear="none"><br clear="none">Joe<a rel="nofollow" shape="rect" target="_blank" href="http://overview.mail.yahoo.com/?.src=iOS"><br clear="none"><br clear="none">Sent from Yahoo Mail for iPad</a></td></tr></tbody></table></div><br clear="none">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br
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