<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><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>Sent from my iPad</div><div><br>On 14/01/2014, at 1:05 pm, hank pronk <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; 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="yahoo_quoted" style="display: block;"> <br> <br> <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 href="mailto:josephperkel@yahoo.com">josephperkel@yahoo.com</a>> wrote:<br> </font> </div> <div class="y_msg_container"><div id="yiv4181002505"><table border="0" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top">What can I get away with as far as transparent see thru panels and not horribly
distort the visual field?<br><br>For example, large transparent panels that double as MBT shell. Any rules of thumb, curvature direction, compound curves vs developable surfaces, etc?<br><br>Joe<a href="http://overview.mail.yahoo.com/?.src=iOS" target="_blank" rel="nofollow"><br><br>Sent from Yahoo Mail for iPad</a></td></tr></tbody></table></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div> </div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>