<html><head></head><body>The key is to have enough empty space at the center, so that the overall density is less than that of water.<br>
<br><br><div class="gmail_quote">On September 2, 2014 12:12:02 PM CDT, Martin Koppenhoefer <dieterdreist@gmail.com> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr"><div class="gmail_extra"><br /><div class="gmail_quote">2014-09-02 17:46 GMT+02:00 Clifford Snow <span dir="ltr"><<a href="mailto:clifford@snowandsnow.us" target="_blank">clifford@snowandsnow.us</a>></span>:<br />
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Then again if I made a pontoon out of concrete, they'd just sink.</blockquote></div><br /><br /><br />
</div><div class="gmail_extra">While I generally agree with your agreement, this is not true, ships can be built out of concrete (think aircraft carriers for instance), and German universities even hold a regular competition who builds the best canoe out of (fibre)cement: <a href="http://www.betonkanu-regatta.de/">http://www.betonkanu-regatta.de/</a><br />
;-)<br /><br /></div><div class="gmail_extra">cheers,<br />Martin<br /></div></div>
<p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr /><br />Tagging mailing list<br />Tagging@openstreetmap.org<br /><a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a><br /></pre></blockquote></div><br>
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