<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top"><div>Alec,<br />I am driving Gamma with two Perry thrusters that have a simple mechanical seal. I think a Minkota could be modified with a mechanical seal. A new end cap and a shaft extension would do it. This could be a add on kit for Psubbers. I can send you pictures of the Perry seal set up.<br />Hank</div></td></tr></table> <div id="_origMsg_">
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Brian Cox via Personal_Submersibles <personal_submersibles@psubs.org>; <br>
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Personal Submersibles General Discussion <personal_submersibles@psubs.org>; <br>
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Re: [PSUBS-MAILIST] Gauge for outside viewport? <br>
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Wed, Oct 7, 2015 2:05:54 PM <br>
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<td valign="top"><div style="font-family:Arial, sans-serif;font-size:10pt;"><div>Alec, BTW, that big 12" seawater depth gauge doesn't have a phosphorus dial, however it is very readable in minimal light and does have a small reflective strip which runs around the one edge of the numbers.</div><div> </div><div>Brian <br clear="none"><br clear="none">--- personal_submersibles@psubs.org wrote:<br clear="none"><br clear="none">From: Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org><br clear="none">To: Personal Submersibles General Discussion <personal_submersibles@psubs.org><br clear="none">Subject: Re: [PSUBS-MAILIST] Gauge for outside viewport?<br clear="none">Date: Wed, 7 Oct 2015 08:29:07 -0400<br clear="none"><br clear="none"></div><div dir="ltr">Just a follow-up on this. While I'm pretty sure external oil filled gauges would work outside I find the oil
doesn't like staying inside them, so I ended up bringing the gauges inside the hull. In the end, the majority of my air system is outside with just the gauges and the BIBS inside the hull. Apart from hull stops, the valves for operating the sub are outside and operated via mechanical through-hulls. It's not hard because there's just three valves total. In my experience most air leaks happen in those valves that are used routinely, as opposed to hull stops that are left alone. Even using top quality Swagelok valves, you sometimes have to tighten things up because a leak develops with use. <div><br clear="none"></div><div>One recent design change is that I'm trying air compensation on the thrusters again. I had originally made them oil compensated because the thrusters are jettison-able and oil compensation meant one less connection between thruster and hull, but I'll give air a try because, with big battery banks and freeboard, I
expect this sub to rack up many more hours of running time than Snoopy did using thrusters just for maneuvering. Air compensation should mean less brush maintenance.</div><div><br clear="none"></div><div><br clear="none"></div><div>Best,</div><div><br clear="none">Alec </div></div><div><br clear="none"><div>On Wed, Oct 7, 2015 at 6:46 AM, Steve McQueen via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="javascript:return">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204, 204, 204);border-left-width:1px;border-left-style:solid;"><div dir="ltr"><div>Alec, while I am not 100% sure from the photo I believe these are standard ss Ashcroft pressure gauges used in industry. They are normally oil filled to dampen the needle movement. The oil is added
through a rubber plug normally that might also act as a compensation diaphragm. Anyway maybe a vendor to start having discussion with.<br clear="none"><br clear="none"></div>Steve<br clear="none"></div><div><br clear="none"><div><div class="yqt0705066940" id="yqt94424"><div><div>On Sun, Sep 20, 2015 at 11:03 PM, Alec Smyth via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="javascript:return">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"></div></div><blockquote style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204, 204, 204);border-left-width:1px;border-left-style:solid;"><div><div><div dir="ltr">I have an interesting thing to think about and wondered if any of the PSUBS brain trust might have a suggestion.<div><br clear="none"></div><div>One of the simplifications on my new sub is that all HP air lines are
external, aside from the BIBS (which is normally shut off anyway). Thus, I'm looking for a 3,000-4,000 psi gauge to mount outside a viewport, like in the Pisces photo that I'll paste below. In case my paste doesn't come through, it is the one at the top of the following article: <a rel="nofollow" shape="rect" target="_blank" href="http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1">http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1</a></div><div><br clear="none"></div><div>The first thing that came to mind was to use a SCUBA submersible pressure gauge, but the problem is these are normally 1 atm dry enclosures of limited depth rating. There is generally little information posted about how deep they'll go, but what I did find was mentioned 260 feet for the plastic ones and 490 feet for the brass variety. This is a 1,000 foot sub.</div><div><br
clear="none"></div><div>The second idea was to use oil filled gauges intended for above-water use. But these generally have considerable bubbles in the oil, are not very good at keeping the oil inside, and have other hardware not intended to live long in sea water.</div><div><br clear="none"></div><div>Any suggestions would be most welcome!<br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div>Thanks,</div><div><br clear="none">Alec </div><div><br clear="none"></div><div><img width="429" height="432" alt="Inline image 1" src="cid:1.182603500@web125406.mail.ne1.yahoo.com"><br clear="none"></div></div>
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