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<body bgcolor="#ffffff" link="#000000" vlink="#000000" alink="#000080" topmargin=0 leftmargin=0 marginwidth="0" marginheight="0"><font face="Courier New" size=2>I am pretty sure GL and the other
classes like a hatch, OP, AOP solution<BR>without electronics a lot
more. </font> <BR><BR>On Euronaut there is a manual ballvale as
Overpressure valve integrate in the hatch<BR>and a red label on the hatch handle
"Never open before equalize". <BR><BR>Its not with the rule because we assume
the operator is able to read a red label - but for us it works. <BR><BR> In
case I had to build something with the rules I just will block with the
ballvalve handle in close position <BR>the hatch handle or the latches.
<BR><BR>Another way could be to design the hatch latches that way on a tread
handle <BR>that you have to turn the whell some turns and it gives the hatches
only a litte opening to equalize <BR>and gives the latches later
complete free with more turns. <BR>In that way you can open the hatch very
fast in case in the batterey get very hot below your feets.. <BR>And you can
still blow your ears drums away in case you like that.. <BR><BR>vbr
Carsten<BR>
<BR>
<BR>"Jon Wallace" <jonw@psubs.org> schrieb:
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<div class="moz-cite-prefix"><br>
Advantage: ABS<br>
<br>
I think the sentence being scrutinized may perhaps just be badly
worded. With the exception of some intricate mechanism that
equalizes as part of a sequence to open the hatch as Jim
suggested, I don't see a way to comply with the requirement
without the involvement of electronics. Philosophically I don't
think I want to rely on an electromagnet or boolean logic giving
me permission to exit the vessel. If Jim's mechanism turns out to
be to complicated then Doug's concern is valid...remember Apollo
1.<br>
<br>
Jon<br>
<br>
<br>
On 12/11/2013 4:17 PM, Alan James wrote:<br>
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<blockquote
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type="cite">
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<div><span>Hi Doug,</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>Elaborating on your
idea.</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>If you had digital
pressure gauges you could have a system</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>comparing the voltage
of the two, & when they were in a </span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>similar range they
would activate or deactivate an electromagnet</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>that pulled back a
latch that was impeding the movement of the hatch</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>release mechanism.
(car door lock mechanism) You would</span></div>
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><span>need a manual
over-ride. Any electronics nerd could do this easily</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>& the car lock
mechanisms I've seen for round $20-</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span
style="BACKGROUND-COLOR: transparent">With the
over-pressure valve set at a couple of psi you know</span><br>
</div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>that on the surface
the most over pressure there could be is</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>what your
over-pressure valve is set at. Under-pressure is</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>not such an issue as
you won't be able to physically open the hatch </span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>if the under pressure
is too much, & hence you have to equalize.</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>So I don't think it
needs sophisticated monitoring. </span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>I'm not sure how much
of an issue it would be if you opened your</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>hatch with a couple of
psi over-pressure. Would the dome fly</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>open at 90 miles an
hour, or would pressure be released incrementally</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>as the hatch dogs
unlatched before fully releasing.</span></div>
<div style="FONT-SIZE: 18px; COLOR: rgb(0,0,0); FONT-STYLE: normal;
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><span>Obviously G.L. thinks
this is an issue.</span></div>
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><span>Alan</span></div>
<br>
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<font face="Courier New" size=2> </font><font face="Courier New" size=2><br><br>-- <br><BR>Carsten Standfuß<BR>Dipl.Ing.Schiffbau @ Meerestechnik<BR>Heinrich Reck Str.12A<BR>18211 Admannshagen Germany<BR><BR>+49 (0) 172 8464 420<BR>WWW.Euronaut.org<BR>Carsten@euronaut.org</font></body>
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