<div dir="ltr"><div>Hi Phillippe, </div><div><br>As others have said, AGM's and Emile for the dome.</div><div><br></div><div>I would try and make it so you can open the hatch from outside.</div><div><br></div><div>If the hatch hinge bracket is the same as the K350, make it stronger. I feel like if I lean too hard on the open hatch, it could bend the bracket. </div><div><br></div><div>With regards to the tanks. If your only diving lakes and flat calm water, the standard tanks are good. Tried and tested.</div><div><br></div><div>Rough weather and open sea is a different story.</div><div><br>The tanks allow the boat to ride well and I find it takes the open sea well, but the tanks spill air. I made semi enclosed and they still lose air in rough water. I can tell you it is unnerving to be in open sea and you boat is trying to dive without you wanting it to.</div><div><br></div><div>Enclosing the tanks fully would solve this problem.</div><div><br></div><div>If it were me, I would make the standard tanks, but then almost fully enclose them all round with just a water inlet hole. Could be made to fit around the forward viewport so you can still see. Then make smaller saddle tanks as well like Alec.<br><br>You get all the benefits. Good longitudinal stability for rough weather. No air loss. Auxiliary tanks for added cross stability and freeboard.</div><div><br></div><div>I might even do a picture....slow day at work... :)</div><div><br></div><div>Kind Regards</div><div>James</div><div><br></div><div><img width="543" height="282" src="cid:ii_j78wls8p0_15e56d0f38086c72"><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On 6 September 2017 at 10:23, hank pronk via Personal_Submersibles <span dir="ltr"><<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div></div>
<div>Hi Philippe,</div><div>It is nice to hear of another project getting under way. I think if you are building from scratch, the side mount MBT's are the only way to go. You can use four tanks with a space between the tanks for the side thruster wash. I think however that steel tanks might be to heavy for a K250 , making the sub behave poorly when you transition from floating to sinking. You will have to do some calculations first, I would recommend aluminum tanks over fibreglass. My sub also had lead acid batteries in a sealed compartment with an air flow system for charging. I went with AGM batteries for the simplicity and added safety. </div><div>Hank</div><div><br></div>
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On Tuesday, September 5, 2017, 6:56:48 PM MDT, Philippe Robert via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<wbr>org</a>> wrote:
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</div></div><div><div><div class="h5"><div id="m_7419674666373889463yiv0917626317"><div dir="ltr">Hi All,<div><br></div><div><div>I undertook the construction of a k-250 submarine. I have most of the metal components to make the pressure hull. I have some questions about batteries, MBT and acrylics dome.</div><div><br></div><div>-Is it a good idea to use deep cycle lead-acid battery inside the pressure hull ? I read on old psubs mailing list to open the hatch when the batteries is charging. (h2)?</div><div><br></div><div>-Do you think that the MBT can be replace by steel saddle tanks ? I have no idea how to make the original one and if I can upgrade the original MBT it will be great.</div><div><br></div><div>-I try to find someone to make my acrylic dome with some experience in submarine dome forming.</div><div><br></div><div>-I live in Quebec, Canada. So, if you know k-250 owner near New Hamphire, Vermont or Main it will be great if I can take a look on the sub. An hour or two, I do not want to disturb the owner.</div><div><br></div><div>tanks</div><div><br></div><div>Philippe </div><div><br></div><div><a href="mailto:phelop@gmail.com" target="_blank" rel="nofollow">phelop@gmail.com</a></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div></div></div></div></div><span>______________________________<wbr>_________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.<wbr>org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/<wbr>listinfo.cgi/personal_<wbr>submersibles</a><br></span></div>
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