<div dir="auto">Hi Brian <div dir="auto">36"od, A516gr70, 3/8" wall. Sail 32"od, A516gr70, 3/4" wall. External t-rings, 2x2x.25 @ 12" o.c.</div><div dir="auto">David</div><div dir="auto"><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Aug 16, 2018, 12:31 PM Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Arial,sans-serif;font-size:10pt">That's interesting ! What is the diameter of the main body of your sub? And what is the thickness of the hull material?<div><br></div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a> wrote:<br><br>From: David Colombo via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] Sand Blasting<br>Date: Thu, 16 Aug 2018 09:38:13 -0700<br><br><div dir="auto">Hi Brian, <div dir="auto">When we were doing the Finite Element Analysis trying to achieve 1000 ft design depth, we ran into that issue. And to honest, we chased the loads and added additional steel and reinforcing, and then the load stress moved somewhere else, and we would chase it again. Ultimately the initial design parameters were exceeded in the weight of the sub, and we never could hit the 1000ft mark. So after a conversation with Cliff, who brought me back to my senses, I put my ego in my back pocket, and settled on the 500ft mark, as we were able to achieve all of my initial design parameters on the first run of the FEA. I know that my design is not the standard k boat, but having been in a few I found that I wanted a bigger sail diameter to accommodate all of my instruments, and my shoulders. This decision I believe was the main reason we could not hit the 1000ft mark. But I'm ok with the depth. Our main pilot sail is 32"od, with a 30"od acrylic dome. The forward sail is 27.5"od. with same dome size. Plenty of room for looking around. I think were forming the forward sail today. So I may have an updated photo soon.</div><div dir="auto"><br></div><div dir="auto">David</div></div><div><br><div>On Aug 16, 2018 6:27 AM, "Brian Cox via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Arial,sans-serif;font-size:10pt"><span style="font-size:10pt">David, I've been looking at your sub configuration and I'm curious about the intersection of the conning tower and the main body of the sub. My original design was a 24" conning tower intersecting a 32" main body. That design was deemed problematic by a consensus of a number of fellow psubbers. The issue was a weak area at the side area where the intersection occurs . Are you planning any additional reinforcement in that area ?</span><div><span style="font-size:13.3333px"><br></span></div><div><span style="font-size:13.3333px">Brian<br></span><div><br><span style="font-size:10pt">--- <a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a> wrote:</span><br><br><span style="font-size:10pt">From: David Colombo via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>></span><br><span style="font-size:10pt">To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>></span><br></div><span style="font-size:10pt">Subject: Re: [PSUBS-MAILIST] Sand Blasting</span><br><span style="font-size:10pt">Date: Tue, 14 Aug 2018 16:09:22 -0700</span><div><br><br><div dir="ltr" style="font-size:10pt">I was just thinking it would be bit less oily and sooty for working on if I had it cleaned. The primer was just a thought to slow down any flash rust while welding tabs etc.<br></div><div style="font-size:10pt"><br><div><div><div dir="ltr"><div>Best Regards,<br>David Colombo<br><img src="http://static.squarespace.com/static/533310a9e4b0fba62008a464/t/5339c1f2e4b041bac4e25d1b/1396294132055/?format=500w" height="110" width="200"><br>804 College Ave<br>Santa Rosa, CA. 95404<br>(707) 536-1424<br><a href="http://www.SeaQuestor.com" target="_blank" rel="noreferrer">www.SeaQuestor.com</a><br><br></div></div></div></div>
<br><div>On Tue, Aug 14, 2018 at 2:34 PM, Alan via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div></div><div>David,</div><div>Some thoughts.</div><div>I would consult your sand blaster to see if he is going to have problems</div><div>getting in to the nose cone area. And also whoever is going to paint it</div><div>to check that the intended primer doesn't have a set time by which it needs</div><div>to have the next coat applied & that it is compatible with your intended marine</div><div>paint system. If they specialise in marine paint application they should be able </div><div>to give you advise on when to prime.</div><div>I painted my sub with marine epoxy but had to buy specialised equipment</div><div>to apply the extra thick paint. Started to get expensive.</div><div>You may have a lot of attachment brackets you want to weld in for seats coms, scrubber, piping etc that you position at a later stage & that might burn your</div><div>external primer.</div><div>Another thought is that if you are getting it blasted professionally you don't</div><div>want to do it twice. You want them to do it once just before painting & clean</div><div>up around the welds for you.</div><div>Cheers Alan</div><div><div><div><br></div><div><br>On 15/08/2018, at 5:19 AM, David Colombo via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote><div><div dir="ltr">
<div>Hi Guys, I have a question on sandblasting my hull parts. The
initial fabrication is almost complete and I was thinking that I might
want to have the parts sand blasted prior to welding them all together.
Maybe even a light primer seal coat to slow flash rust as it may be at
the welders for a couple of weeks. Any thoughts or advice would be
appreciated. I know right now every time I get near the parts I'm
covered in black smudges.</div><div><br></div>
<br><div><div><div dir="ltr"><div>Best Regards,<br>David Colombo<br><img src="http://static.squarespace.com/static/533310a9e4b0fba62008a464/t/5339c1f2e4b041bac4e25d1b/1396294132055/?format=500w" width="200" height="110"><br>804 College Ave<br>Santa Rosa, CA. 95404<br>(707) 536-1424<br><a href="http://www.SeaQuestor.com" target="_blank" rel="noreferrer">www.SeaQuestor.com</a><br><br></div></div></div></div>
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