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Re: Re: [PSUBS-MAILIST] hull test
NO NO NO!!!
Sorry guys, I meant leave the camcorder running in the hull and review it
when you drag the thing back to the surface.
I didn't mean running data cable to the surface!
Rick
Vancouver
----- Original Message -----
From: "irox" <irox@ix.netcom.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, October 27, 2005 1:46 PM
Subject: Re: Re: [PSUBS-MAILIST] hull test
>
> The camcorder idea might be a bit problematic, depending how deep your sub
> is being tested. The longer your cable, the higher the resistance, the
worse the signal
> quality will be when it reaches the surface. Of course it's pretty
straight forward to
> test, just layout the cable and dry land and what you can see.
>
> RS432 (slow) or fiber-optic (fast) would work over large distances, but
this would
> increase costs (the later more than the former) and complexity.
>
> Ian.
>
> -----Original Message-----
> From: Paul Kreemer <paulkreemer@gmail.com>
> Sent: Oct 27, 2005 3:43 PM
> To: personal_submersibles@psubs.org
> Subject: Re: Re: [PSUBS-MAILIST] hull test
>
> Rick, there you go, some good practical methods. Put a plain old camcorder
> onboard. My idea with a video cable running to the surface was way too
> complicated. And pessimistic. You want to believe that you'll get the
> camera, and sub, back fairly dry.
>
> Come to think of it, I have a JVC miniDV camera that I would love to
consign
> to a deep watery grave... Or use in an ROV and not worry about flooding.
>
>
> Paul
> Sub-Log.com
> Seattle, WA
>
> On 10/27/05, Alec Smyth <Alec.Smyth@compuware.com> wrote:
> >
> > If I recall correctly, Piccard tested his bathyscaphe by sending it down
> > unmanned with a simple clock mechanism to release ballast. In that case,
it
> > was done untethered in the open ocean and the sub had virtually no depth
> > limit, but I can see doing a test like that with Euronaut if you first
> > tethered a line between an anchor and a buoy, and sent the sub up and
down
> > that so as to have more control over where it surfaced at the end of the
> > test.
> > Alec
> >
> > -----Original Message-----
> > *From:* Dan H. [mailto:jmachine@adelphia.net]
> > *Sent:* Wednesday, October 26, 2005 10:30 PM
> > *To:* personal_submersibles@psubs.org
> > *Subject:* Re: Re: [PSUBS-MAILIST] hull test
> >
> > Bill, Paul,
> > I don't think microwaves are used in underwater communication, but I'm
> > not positive. For local communicating acoustic equipment is used. It is
like
> > radio communication but instead of an electrical radio frequency
carrier, it
> > uses a high frequency sound wave carrier. Mechanical not electrical, or
> > sound wave not electrical wave,
> > For a deep water test, if I ever had to do another, I'd use a line for
> > safety and to control decent, but also a simple two wire cable connected
to
> > a magnetic drop weight system. Something simple, controlled with a dry
cell
> > in a plastic bag or something as simple as that. No need to get fancy
but a
> > magnetic release with actual wires to the surface would be best.
> > In large subs they do usually test manned since a leak, or anything
that
> > is fixable, is dealt with as the test is in progress. Also I remember
> > reading somewhere that strain gauges are placed in critical parts on the
> > hull to monitor its performance. These need to be tended to and
monitored.
> > They just pilot it down and watch to see what is happening.
> > Dan H.
> >
> > ----- Original Message -----
> > *From:* Paul Kreemer <paulkreemer@gmail.com>
> > *To:* personal_submersibles@psubs.org
> > *Sent:* Wednesday, October 26, 2005 4:39 PM
> > *Subject:* [Norton AntiSpam] Re: [PSUBS-MAILIST] hull test
> >
> > Boy I like Bill's idea of remote control of a few key systems. Why not
> > attach an umbilical for ballast control, leak detectors and maybe an
> > internal camera? One downside of a wire would be coming up with the
300-1000
> > feet of cable needed. But you'd have, in effect, a super-size ROV with
> > optional human cargo. ;-)
> >
> > Paul
> >
> > On 10/26/05, Akins <lakins1@tampabay.rr.com> wrote:
> > >
> > > Your below post got me to wondering Dan.
> > > Since we use microwave transmissions for underwater communications,
why
> > > couldn't microwave transmissions
> > > be used to activate a remote control in a sub the size of Carsten's
so
> > > that a test line would only be there for making
> > > sure the sub did not drift away and for a secondary backup. Would the
> > > microwave transmissions go thru the hull and
> > > the remote could be rigged to activate the ballast pumps so the sub
> > > could surface after the test depth and time were reached?
> > > Would this be feasible or practical?
> > > Bill.
> > >
> > > ----- Original Message -----
> > > *From:* Dan H. <jmachine@adelphia.net>
> > > *To:* personal_submersibles@psubs.org
> > > *Sent:* Wednesday, October 26, 2005 8:12 AM
> > > *Subject:* Re: [PSUBS-MAILIST] hull test
> > >
> > > Silky,
> > >
> > > A sub hull is a lot of money and work to loose if you lower it to the
> > > bottom
> > > for a test on a line, with no person in it, but it's the safest way to
> > > test
> > > a personal sub. Of course testing in a pressure chamber would be even
> > > better but most small sub builders don't have or can't afford this
> > > luxury.
> > > Even with the risk of loosing the sub because of a simple line
> > > malfunction,
> > > a deep water test of the hull should be done unmanned. After all, it's
a
> > >
> > > test to see if you'll be safe diving in it.
> > >
> > > A sub the size of Carsten's is not in this category. I can only
imagine
> > > the
> > > feeling in Carstan's gut when he does his tests, manning it himself. I
> > > have
> > > a lot of faith is the calculating skills of a man that can design and
> > > build
> > > such a project and I'm sure he's pretty confident he will have no
> > > problems
> > > he can't solve as he goes, but we all know there is considerable risk
> > > involved.
> > >
> > > P-subs should only be test proven unmanned!
> > > Dan H.
> > > ----- Original Message -----
> > >
> > >
> >
>
>
>
>
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