<font color='black' size='3' face='Arial, Helvetica, sans-serif'><font size="3" style="color: black; font-family: Arial, Helvetica, sans-serif;">Jim,</font>
<div><font size="3"><font face="Arial, Helvetica, sans-serif">Snoopy can do roll control because she has sufficient metacentric height to start with, and is improving on what she already has while surfaced. For the uninitiated, MH is the distance between a center of gravity and a center of buoyancy. Due to the stock fore and aft tanks, Snoopy (like all K-boats) tends to be roly-poly. But even without the side tanks, they won't roll over (or at least won't <i>stay</i> rolled over) because there is a good solid MH integral to the design. Brian, I suspect, has the other problem. His MH is too short, and that simply won't work. Also, it's good to keep in mind that the metacentric height changes (shortens) as and after you submerge. There are a whole bunch of fun calculations that have to be done to prove to ABS (for instance) that the boat will retain sufficient stability in whatever trim she is in, surfaced, diving, and submerged. There just ain't no substitute for MH in that game. As to Brian's problem I'd say that if he does have sufficient payload capacity to add lead down low, then he could easily lower the sub's CG without altering its CB, which would improve the MH. Is that enough acronyms for now? In any case, if he actually does have the payload for another 500# of lead (or whatever), I'd be prone to strapping that under the hull and try again before going to work with the edge grinder, just to see if it works.</font></font></div>
<div><font size="3"><font face="Arial, Helvetica, sans-serif">Vance<br>
</font></font><br>
<br>
<div style="color: black; font-family: helvetica, arial; font-size: 10pt;">-----Original Message-----<br>
From: via Personal_Submersibles <personal_submersibles@psubs.org><br>
To: personal_submersibles <personal_submersibles@psubs.org><br>
Sent: Thu, Apr 14, 2016 11:21 am<br>
Subject: Re: [PSUBS-MAILIST] more Esmae video<br>
<br>
<div id="AOLMsgPart_1.2_85ca0c62-c0c6-489e-8e43-43ca5e894f48">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000" class="aolReplacedBody"><font color="#000000" size="2" face="Arial">
<div><font size="3">Brian,</font></div>
<div><font size="3">Alec imparted some education to me one time on roll
control. When he added side ballast tanks to Snoopy, I asked why he had
mounted them so they were partially above the waterline when surfaced. He
explained that when the vessel rolls to one side, the tank on that side then
becomes more submerged and provides more "lift." Simultaneously the tank
on the other side rises and provides less lift. The net effect is
automatic roll dampening.</font></div>
<div><font size="3">Jim T.</font></div>
<div><font size="3"></font> </div>
<div> </div>
<div>
<div>In a message dated 4/14/2016 9:18:04 A.M. Central Daylight Time,
<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> writes:</div>
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><font style="BACKGROUND-COLOR: transparent" color="#000000" size="2" face="Arial">
<div style="FONT-SIZE: 10pt; FONT-FAMILY: Arial, sans-serif">
<div>Hi Alan, Going to add a lot of weight to the bottom of the
concrete ballast , at the very bottom. Need to cut an access hole in
that area so I can put lead bars in there and bolt them in.</div>
<div> </div>
<div>Brian<br>
<br>
--- <a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br>
<br>
From: Alan
via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
To:
Personal Submersibles General Discussion
<<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br>
Subject: Re: [PSUBS-MAILIST] more
Esmae video<br>
Date: Thu, 14 Apr 2016 19:17:46 +1200<br>
<br>
</div>
<div>Another interesting video Brian.</div>
<div>I see what you mean about the stability.</div>
<div>Pity you couldn't have sunk her completely to see how stable </div>
<div>she was once that big conning tower was under the water.</div>
<div>What's the next step?</div>
<div>I am not sure I am getting all the posts so apologies if I'm
doubling </div>
<div>up on any one else's comments.</div>
<div>Alan<br>
<br>
Sent from my iPad</div>
<div><br>
On 13/04/2016, at 10:19 am, Brian Cox via Personal_Submersibles
<<a title="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>>
wrote:<br>
<br>
</div>
<blockquote>
<div>
<div style="FONT-SIZE: 10pt; FONT-FAMILY: Arial, sans-serif">
<div>Hi All,</div>
<div>
Here is some additional video made by a friend of mine:</div>
<div> </div>
<div><a title="https://vimeo.com/162570037" target="_blank" href="https://vimeo.com/162570037">https://vimeo.com/162570037</a></div>
<div> </div>
<div>Brian</div>
</div>
</div>
</blockquote>
<blockquote>
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