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Carsten, I was thinking that if you set a air regulator at just above the final pressure you want the diver lockout or hyperbaric chamber to be at, after the last pressure tank the feeds that air valve. That way you wouldn't have near as much hissing from air coming in at say 120 PSI to 3,000 PSI, and in are hyperbaric chamber set-up we would have all the rubber hose length and air filters to take up sound. In just playing around, I worked up a really expensive submadman air muffler. Just add a length of plastic PVC or ABS pipe about a 18 inches long by say 2 inches ID, with a cap on the end of it, and a good number of good sized holes drilled into it. Then wrap an entire bath towel around the tube, and hold it on with a couple of plastic zip ties. Wa la, hiss noise gone, and you've also just added a air filter. I don't suggest using the wifes pink towels however. For a more manly air filter, use a black towel, black zip ties, and black ABS plumbing parts. Also if you first dry the towel with a scented fabric softener, your diver lockout will smell like a spring meadow. If your into that sort of thing. On top of all that, it is easily unscrewed so you can use it as a club to keep out unwanted divers and sea monsters, just not the mermaids. ;)' Well Carsten, it looks like it's time for use to drink beer in your diver lockout chamber again while the rest of the SMMO's get to go to the convention. That reminds me, I need to install a nice cup holder in my K-250. Cheers, Szybowski. Date: Tue, 29 Jul 2008 21:10:59 +0200 To: personal_submersibles@psubs.org Subject: [PSUBS-MAILIST] Re: [PSUBS-MAILIST] Pressure hull framing options. From: MerlinSub@t-online.de Hi Brent The frame distance in the diver chamber is longer as the normal frame distance because of the huge bottom exit and therfore we decide to reinforce this area all around with the 8 longitudinals. Also two of them are use as support for the bottom exit. two more longitudinals are reinforce the sail hatch cylinder botom conetion to the pressure hull. Yes the motorcycle muffer should reduce the noice of the high pressure air. But dont work well - so we decide to replace this unit by a self designed unit in the future. vbr Carsten -----Original Message----- Date: Tue, 29 Jul 2008 01:46:14 +0200 Subject: RE: [PSUBS-MAILIST] Pressure hull framing options. From: Brent Hartwig <brenthartwig@hotmail.com> To: <personal_submersibles@psubs.org> Hello Carsten, Thanks for those pictures and drawing. I really wanted to see those and hope to make good use of them in future projects. The drawing I had seen some years ago was a front cross section view of the diver lockout, showing the 8 longitudinal support members in it. I had taken that to mean you had planned to have those through the entire hull. Why only put them in the diver lockout? Is it to reinforce the H ring rolled on edge that is supporting the smaller head leading to the control room? I noticed there is what looks like a motorcycle muffler for reducing the hiss of incoming high pressure air into the diver lockout. Is that what it is, and if so does it work well for you? We need a better muffler setup for are hyperbaric chambers. We are using the tiny crushed brass balls type muffler. They don't work that well. http://www.frappr.com/?a=viewphoto&id=4001713&pid=10244472 Regards, Brent Hartwig > Subject: RE: [PSUBS-MAILIST] Pressure hull framing options. > From: MerlinSub@t-online.de > To: personal_submersibles@psubs.org > Date: Wed, 23 Jul 2008 16:02:00 +0000 > > Hi Brent, > > I use H-Frames bended in both directions and also longitudinal H-Frames. > > http://www.euronaut.org/content/upload/notes/H-frames.jpg > http://www.euronaut.org/content/upload/notes/IMG_2289.JPG > http://www.euronaut.org/content/upload/notes/Pic00003.jpg > http://www.euronaut.org/content/upload/notes/Pic00046.jpg > > This Frame : (called: double T) v = weld > > ============hull=== > v-----v > I > I > ----- > > is nearly perfect because it is self supporting and need only a small all around weld to the hull. > And the longitudinal tensile strength goes soft into the frame.. > > > And this Frame : > > =================hull=== > vI Iv > I-----I > I I > > is nearly perfect to integrate an internal endcap- > > > > =================hull=== > vI Iv > I-----I > vI Iv > ========I > I > I > I > I > Endcap > > > No worry about double plating and corrosion. > Only a small amout of oxygen inside the gap - eaten > by a very little amount of FeO2 - than corrosion stops. > > VBR Carsten > > > > ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. 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