<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hank,</div><div id="AppleMailSignature">I like the purpose built flexible gas tanks because they are easy to fill & empty,</div><div id="AppleMailSignature">& built for the purpose. Don't fancy filling an inner tube with gas through a valve!</div><div id="AppleMailSignature">I had suggested before that if you were doing long transits with your sub you </div><div id="AppleMailSignature">could fill up those flexible tanks at a gas station at your destination. Maybe pour</div><div id="AppleMailSignature">their contents back in your car for the return trip! ( or did you say you were running</div><div id="AppleMailSignature">deisel). </div><div id="AppleMailSignature">You need some sort of structure to support them, so why not ( as previously suggested)</div><div id="AppleMailSignature">build fibreglass tanks with some sort of diaphragm for the small bit of equalisation</div><div id="AppleMailSignature">you may need!</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 18/07/2017, at 11:55 AM, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1500335283771_2504">Alan,</div><div id="yui_3_16_0_ym19_1_1500335283771_2504" dir="ltr">When you mentioned using gasoline for buoyancy and showed a nice bladder for fuel, I did a test. I though about what would be the lowest cost bladder to hold gasoline. I thought of an inner tube, so I went to my inner tube spot on the shelf and cut sample pieces and put them in a jar with gasoline. I don't remember how long ago that was now but I just checked the sample and the inner tube rubber appears unaffected. When I googled the idea, I did not find positive information, so a test was in order. I also have a long running test of an inner tube with oil in it, for over a year now I have been testing that, so far all is good.</div><div id="yui_3_16_0_ym19_1_1500335283771_2504" dir="ltr">Hank</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>