<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>Marc,</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>>></span><span style="font-size: 15.555556297302246px;">Right now I feel like I'm one of a tiny deviant cult</span><span style="font-size: 15.555556297302246px;"> .......</span></div><div style="color: rgb(0, 0, 0); font-size: 15.555556297302246px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="font-size: 15.555556297302246px;"> Well you are an American of French heritage hiding away on an obscure</span></div><div
style="color: rgb(0, 0, 0); font-size: 15.555556297302246px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="font-size: 15.555556297302246px;">seldom visited South East Asian Island populated by man hungry women</span></div><div style="color: rgb(0, 0, 0); font-size: 15.555556297302246px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="font-size: 15.555556297302246px;">& Moslem rebels.</span></div><div style="color: rgb(0, 0, 0); font-size: 15.555556297302246px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span style="font-size: 15.555556297302246px;">Alan</span></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> Marc de Piolenc <piolenc@archivale.com><br> <b><span style="font-weight: bold;">To:</span></b> personal_submersibles@psubs.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, April 12, 2014 1:42 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] concrete<br> </font> </div> <div class="y_msg_container"><br>I think I will post those reports to Dropbox.<br clear="none"><br clear="none">Right now I feel like I'm one of a tiny deviant cult of Portland cement <br clear="none">cultists within the psubs community. Maybe the reports will help me <br clear="none">proselytize new adherents...<br
clear="none"><br clear="none">Marc<br clear="none"><br clear="none">On 4/12/2014 9:03 AM, hank pronk wrote:<br clear="none">> Marc,<br clear="none">> Not only is it dirt cheap, concrete is so easy to form. The material cost for a 6 foot sphere is in the hundreds, not thousands. Hank<br clear="none">> --------------------------------------------<br clear="none">> On Fri, 4/11/14, Marc de Piolenc <<a shape="rect" ymailto="mailto:piolenc@archivale.com" href="mailto:piolenc@archivale.com">piolenc@archivale.com</a>> wrote:<br clear="none">><br clear="none">> Subject: Re: [PSUBS-MAILIST] concrete<br clear="none">> To: "Personal Submersibles General Discussion" <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">> Received: Friday, April 11, 2014, 8:26 PM<br clear="none">><br
clear="none">> I don't have hard numbers, but<br clear="none">> remember that resistance to mostly<br clear="none">> compressive loading is a structural STABILITY problem. Most<br clear="none">> practical<br clear="none">> steel structures buckle under compression long before<br clear="none">> reaching their<br clear="none">> actual compression limit. Concrete has an advantage there<br clear="none">> due to its<br clear="none">> stiffness - the NCEL tests suggest that it comes much closer<br clear="none">> to using<br clear="none">> its full compressive strength.<br clear="none">><br clear="none">> That said, my primary interest in concrete is due to its<br clear="none">> cost and ease<br clear="none">> of maintenance.<br clear="none">><br clear="none">> Marc<br clear="none">><br
clear="none">> PS. If anybody is interested, I will add the relevant<br clear="none">> reports that I<br clear="none">> have to my public Dropbox folder and post the link.<br clear="none">><br clear="none">> On 4/12/2014 3:15 AM, hank pronk wrote:<br clear="none">> > A six foot od sphere built in 1.25in thick steel would<br clear="none">> be equal in weight to 4in thick concrete. I would not<br clear="none">> ever expect 4in concrete to compare to 1.25 steel.<br clear="none">> But, it would be interesting to know where the concrete<br clear="none">> stands in comparison.<br clear="none">> > Hank<br clear="none">> > --------------------------------------------<br clear="none">> > On Fri, 4/11/14, Marc de Piolenc <<a shape="rect" ymailto="mailto:piolenc@archivale.com"
href="mailto:piolenc@archivale.com">piolenc@archivale.com</a>><br clear="none">> wrote:<br clear="none">> ><br clear="none">> > Subject: Re: [PSUBS-MAILIST] concrete<br clear="none">> > To: "Personal Submersibles General<br clear="none">> Discussion" <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">> > Received: Friday, April 11, 2014, 9:59<br clear="none">> AM<br clear="none">> ><br clear="none">> > A huge amount of work was done on<br clear="none">> > concrete for pressure-resisting<br clear="none">> structures, including long<br clear="none">> > term, deep exposure tests, by the US<br clear="none">> Naval Civil Engineering<br
clear="none">> > Laboratory. Most of the reports are<br clear="none">> available for<br clear="none">> > downloading free of charge from DTIC.<br clear="none">> ><br clear="none">> > Excellent results were achieved with<br clear="none">> concrete having NO<br clear="none">> > reinforcement. There has been limited<br clear="none">> work done with<br clear="none">> > prestressed concrete and even less<br clear="none">> done with reinforced<br clear="none">> > concrete and ferrocement, which can<br clear="none">> reasonably be expected<br clear="none">> > to give much more efficient and<br clear="none">> distortion-tolerant<br clear="none">> > structures.<br clear="none">> ><br clear="none">> >
Marc<br clear="none">> ><br clear="none">> > On 4/11/2014 8:25 PM, hank pronk<br clear="none">> wrote:<br clear="none">> > > A cheap alternative to a super<br clear="none">> strong sphere hull is<br clear="none">> > re-enforced concrete. I feel like<br clear="none">> hiding under a blanket<br clear="none">> > while I say this,lol. I know it<br clear="none">> is way out there, but<br clear="none">> > concrete is super strong under<br clear="none">> compression. It is not<br clear="none">> > so good for impact resistance.<br clear="none">> Concrete is a very easy<br clear="none">> > material to work with and form into a<br clear="none">> sphere shape. I<br clear="none">> > have no idea what
thickness would be<br clear="none">> needed. Properly<br clear="none">> > engineered I would trust it.<br clear="none">> > > Hank<br clear="none">> > ><br clear="none">> > ><br clear="none">> _______________________________________________<br clear="none">> > > Personal_Submersibles mailing<br clear="none">> list<br clear="none">> > > <a shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">> > > <a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">> > ><br clear="none">> ><br
clear="none">> > -- Archivale catalog: <a shape="rect" href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br clear="none">> > Polymath weblog: <a shape="rect" href="http://www.archivale.com/weblog" target="_blank">http://www.archivale.com/weblog</a><br clear="none">> > Translations (ProZ profile): <a shape="rect" href="http://www.proz.com/profile/639380" target="_blank">http://www.proz.com/profile/639380</a><br clear="none">> > Translations (BeWords profile): <a shape="rect" href="http://www.bewords.com/Marc-dePiolenc" target="_blank">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">> > Ducted fans: <a shape="rect" href="http://massflow.archivale.com/" target="_blank">http://massflow.archivale.com/</a><br clear="none">> > _______________________________________________<br
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href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">> ><br clear="none">><br clear="none">> --<br clear="none">> Archivale catalog: <a shape="rect" href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br clear="none">> Polymath weblog: <a shape="rect" href="http://www.archivale.com/weblog" target="_blank">http://www.archivale.com/weblog</a><br clear="none">> Translations (ProZ profile): <a shape="rect" href="http://www.proz.com/profile/639380" target="_blank">http://www.proz.com/profile/639380</a><br clear="none">> Translations (BeWords profile): <a shape="rect" href="http://www.bewords.com/Marc-dePiolenc" target="_blank">http://www.bewords.com/Marc-dePiolenc</a><br clear="none">> Ducted fans: <a shape="rect"
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