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Hi Ian, I was thinking about the subject of moister in the concrete of your hull, and was thinking that there must be allot of good books and articles on maintaining concrete sailboats out there that would be of good use for you. Keeping the concrete sealed will be a challenge, but since there are some great sealing products out there you should be able to do it to your satisfaction. I remember my father talking to me about the concrete poured into a foam block system for building homes like the Arxx Blocks brand, and I thought he said that one of the advantages to using this type of permanent form is it keeps in a fair bit of the moister that was put into the concrete to start with, and that made the concrete some what stronger then if it was allot more dry long term. I'll have to ask him again and then look to see if I can find any long term stress analysis data. Regards, Brent Hartwig > Date: Fri, 28 Dec 2007 17:54:16 -0500 > From: irox@ix.netcom.com > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] 200ton 18meter Live aboard submarine > > > Hi Frank, > > feel free to ask away, I'll do my best to answer everybodies questions, > issues and ideas. > > For questions the hull's construction, I should defer these questions to > Wilfried, since he's the guy making the hull. I will say, the thickest > point of the hull is around 350mm. I don't think there is any need to > use stainless re-bar (since the re-bar won't be exposed to the elements). > > Wilfried has constructed several concrete submarines before building > his 20tons 9meter submarine. We don't have plans to structurally test > mock ups of the hull for this project, just create a scaled up version > of Wil's successful 20tons submarine. > > Cheers, > Ian. > > -----Original Message----- > >From: ShellyDalg@aol.com > >Sent: Dec 28, 2007 4:49 PM > >To: personal_submersibles@psubs.org > >Subject: Re: [PSUBS-MAILIST] 200ton 18meter Live aboard submarine > > > >Hello Ian.If you don't mind me asking, how thick is the hull ? Are there > >internal rings of concrete or steel ? > >Is there reinforcing wire like a ferrous cement sailboat or just the re-bar. > >Would it make sense to use stainless re-bar ? I would think retaining rings > >of stainless would be easily cast into the concrete hull, with anchor points > >welded so that they were embedded in the concrete and connected to the re-bar, > > but Wil is the expert on this. If 30 meter or 90 feet is your average depth, > >and you tested it to 90 meters, what are the pressure cycles like as it > >pertains to number of cycles before failure. It's one thing to make a structure > >from concrete and send it down and leave it, but repeated cycles are a > >different thing. Will you be doing any testing with mock-ups before you start the > >real thing ? > >Sorry if I'm being too nosy, but the whole project just sounds so damn > >interesting. I know all the guys will be following this build very closely, and > >again, I wish you all the luck. Frank D. > > > > > > > >**************************************See AOL's top rated recipes > >(http://food.aol.com/top-rated-recipes?NCID=aoltop00030000000004) > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > The personal submersibles mailing list complies with the US Federal > CAN-SPAM Act of 2003. Your email address appears in our database > because either you, or someone you know, requested you receive messages > from our organization. > > If you want to be removed from this mailing list simply click on the > link below or send a blank email message to: > removeme-personal_submersibles@psubs.org > > Removal of your email address from this mailing list occurs by an > automated process and should be complete within five minutes of > our server receiving your request. > > PSUBS.ORG > PO Box 53 > Weare, NH 03281 > 603-529-1100 > ************************************************************************ > ************************************************************************ > ************************************************************************ > |