<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi Dave,<div><br></div><div>Is it just one tank per side? If so you could valve them separately for redundancy but there is literally no situation where you’d need to control them independently to adjust lateral trim. If you have (or could have) two tanks per side, then it’s really useful to plumb them in forward and aft pairs. </div><div><br></div><div>Best,</div><div>Alec<br><br><div id="AppleMailSignature" dir="ltr">Sent from my iPhone</div><div dir="ltr"><br>On Jan 17, 2019, at 5:18 PM, David Colombo via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="auto">Alan, that's a good point. Nothing wrong with multiple vents <div dir="auto">David</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Jan 17, 2019, 2:02 PM hank pronk 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><div class="m_3330854085815194763ydpda729f9ayahoo-style-wrap" style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div></div>
<div>Alan,</div><div>Good points, I almost made that mistake on E3000. I ended up with individual pneumatic valves on each tank. </div><div>Hank</div><div><br></div>
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On Thursday, January 17, 2019, 2:40:45 PM MST, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="noreferrer">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="m_3330854085815194763yiv4299409874"><div><div></div><div>David,</div><div>some food for thought on the ballast valve issue.</div><div>GL requires that you be able to still get out if one of the ballast tanks is damaged.</div><div>If your left ballast tank was hit high by your support boat etc & ruptured &</div><div>if you had left & right ballast tanks vented from a single vent, then the right </div><div>would also leak air out the left ballast tank rupture.</div><div>I am making solenoid operated ballast valves that are linked to software & will level automatically.</div><div>Alan</div><div class="m_3330854085815194763yiv4299409874yqt6910430273" id="m_3330854085815194763yiv4299409874yqt28180"><div><br clear="none">On 18/01/2019, at 9:38 AM, David Colombo via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div>Hi Cliff, I plan on doing a manifold system that groups together a couple of tanks for both port and starboard tanks and foward and aft tanks. I hope to use electric valves. The varible ballast is a worm drive 100# weight internal under my battery area. The external mbt will all be molded fiberglass shapped around the ribs between the pressure hull and exoskeleton, with the exoskeleton being one side of the tanks. I also plan on a lifting bag component at the nose area forward of the front pilot to be used to lift that pilot higher out of the water to increase the freeboard height of the ct for on station personal transfers. Question, if i have a starboard and port tank, would you manifold them to a single valve locatation at the 12 oclock position, or use two valves to control each side. <div><br clear="none"></div><div>David</div></div><br clear="none"><div class="m_3330854085815194763yiv4299409874gmail_quote"><div dir="ltr">On Thu, Jan 17, 2019, 11:14 AM Cliff Redus via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote class="m_3330854085815194763yiv4299409874gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydp4e0e50b7yahoo-style-wrap" style="font-family:times new roman,new york,times,serif;font-size:16px"><div></div>
<div>Nice to see progress on your boat. I love the pics. On your segmented wrap around MBT, how are you going to vent the individual MBT segments? Are you going to use pneumatic actuated vent valves like Alec has on Shackleton or are you going to try and manifold the vent piping and have single MBT vent valves on the port and starboard side?</div><div><br clear="none"></div><div>Back to Hank's question, are you going to have a VBT or are you going to handle variable ballast like I do by adding ballast weights at the CG of the boat?</div><div><br clear="none"></div><div>What are you going to make the MBT segments out of, plastic like <span><span style="color:rgb(34,34,34);font-family:Roboto,arial,sans-serif;font-size:16px">polyethylene, polypropylene or layup </span></span>FRP?</div><div><br clear="none"></div><div>Cliff</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div>
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On Thursday, January 17, 2019, 8:59:28 AM CST, David Colombo via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995"><div><div>Hi Hank, we have a trim weight inside using a worm gear drive, and the main ballast tank is a series of wrap around tanks between the hull and exoskeleton.<div>David</div></div><br clear="none"><div class="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995gmail_quote"><div class="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995yqt1599385611" id="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995yqt18656"><div dir="ltr">On Thu, Jan 17, 2019, 5:34 AM hank pronk via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote class="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995m_598496672674728081ydp89be2be8yahoo-style-wrap" style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div></div>
<div>David,</div><div>Will you have a VBT? Is the fibre glass shell acting as the MBT or will you have tanks? </div><div>Hank</div><div><br clear="none"></div>
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On Thursday, January 17, 2019, 4:46:14 AM MST, hank pronk via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div>David,</div><div>Looking sweet</div><div>Hank</div><div><br clear="none"></div>
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On Wednesday, January 16, 2019, 8:59:28 PM MST, David Colombo via Personal_Submersibles <<a rel="nofollow noreferrer" shape="rect" href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="m_3330854085815194763yiv4299409874m_-9011622145782627168m_462937028384382176ydpb8519099yiv7623860995m_598496672674728081yiv2295826328"><div>Hi guys, started to build the work platform for the building of the SeaQuestor exoskeleton. I couldnt resist setting the stations to get a look.<div>David</div></div>
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