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Hi Jon, Sure I'll see what I can do. The Captian did at least one unmanned dive test of every K-250 he and his crew built, to 500 fsw, except mine, according to his book. Mine was later tested to at least 500 ffw by Dr. LeShack. Kittredge took a K-250 to the US Navies test chamber at General Dynamics and the blown dome imploded at 824 feet, which was very closely to George's calculations. Page 249 in his book. The new 1.5" thick cast acrylic conning tower will be able to resist more pressure then that. I'll have to gather more data and run the FEA on that part and the rest of the new assembly and see where I'm at from there. I'm shotting from the weakest part, and/or assembly to have a FOS of 2.5. So 1,250 fsw minum. I might not be able to comfertabley do 500 fsw, once all the figuring is done. But I might have even more. We'll see what we see. I was not planning on factoring in the syntactic foam for dealing with the external hydrostatic load for the FOS of 2.5. But if I was able to obtain good data on the mechanical properties of the type of syntactic foam I go with, then that area of the design might very well be able to with stand far more then 500 fsw. Because I'm using syntactic foam between the support ribs. I don't plan on needing the horizontal weldments I had once planned to use, for collision protection and resistence to external hydrostric load. Because I have a good source, I might go with Divencell micro spheres, and a high grade infusion molding vynel ester resin I fully expect to need to replace the forward viewport welded in seating ring, and thicken up the acrylic. I'm considering increasing the current 14.75" viewing to 16 or 17. I'm currently working thru the detials, and getting ready to run the FEA. According to your conservative viewport calculator for a 16" Di, and a operating depth of 500 feet, it would have a OD of 20", a thickness of 3.20". With the failure depth being 3,300 feet. That's an odd thickness, so I'll likely got with 3 or 3.25". I had guessed I would need about a 3" thick window there, so I must be getting better at this. ;} My K-250 has more conning tower support then shown in the current plans. Since I have the overlapping saddle collar. In addion to that the 3/4" of syntact foam that will coat the interior of the conning tower will add some strength. I'm planning on installing a full set of K-350 type A516 gr70 steel support rubs. Right next to the extisting A36 rolled angle iron one. This way I get the extra strength, and I have a flang on both sides of the void space to better hold in the syntactic foam. The current rubs have a ID of 32.50". The new surport ribs will have a ID of close to 33" so they can overlap the current flanges, and a OD of would need to be about 35" to allow them to go over the top of the current weld bead that is against the inner hull surface. Any thoughts on this configuration are very welcome from you guys. Since it's not set in stone yet, and I want to get it right. Regards, Szybowski > Date: Fri, 10 Jul 2009 10:15:15 -0400 > From: jonw@psubs.org > To: personal_submersibles@psubs.org > Subject: Re: [PSUBS-MAILIST] KL-250's Syntactic Foam Data > > > Hi Brent, > > Can you provide more details of how your upgrades are going to rate the > K250 for 500 feet? > > Thanks, > Jon > > > > Brent Hartwig wrote: > > > > Since I'm replacing the weakest parts of the original K-250 sub > > design, such as the blown dome and the forward viewport assembly. I > > plan to upgrade the subs operational depth to 500 fsw. So I guess > > that would make it a KL-500. ;} > > > > > > > ************************************************************************ > ************************************************************************ > ************************************************************************ > 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 > ************************************************************************ > ************************************************************************ > ************************************************************************ > |