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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 > > > > |