Vance,
Since I would never discard any tidbit of your sage advice, I can prove my innocence! But damn, look at the timestamp on that email. I think you can be forgiven for forgetting...
-------------------------------------------------------------------------------------------------------------------------------------------------------
From: VBra676539@aol.com [mailto:VBra676539@aol.com]
Sent: Wednesday, February 02, 2005 3:58 AM
To: Alec Smyth
Subject: Re: dive sites in FL
Alec,
Showing up with a sub is only a mild bump in the road down here. In fact, showing up with the space shuttle probably wouldn't surprise too many people. They'll be interested, but then there's the blonde in the g-string right over there...
I'd say the Keys are pretty good for close dives with interesting bottom features. Seclusion, however, ain't in the picture. All the blondes in g-strings are down there, plus all the people watching them. The big issue is distance. Palm Beach in the summertime is a good area--reasonable visibility and reefs, ledges or wrecks (you choose) to look at. However, the Gulf Stream, which meanders a bit depending on season, reaches its closest proximity to land at the inlet there--about a 1/4 mile offshore. And it can be fierece.
Vance
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Now, you BETTER call me to make a pit stop here on your way up I-95 to the next convention, eh?
:)
Alec
PS: The displacement has gone from 3,300 to 4,500 lbs due to the addition of external VBT and battery pods, and a coning tower.
________________________________
From: owner-personal_submersibles@psubs.org on behalf of vbra676539@aol.com
Sent: Fri 1/5/2007 11:21 AM
To: personal_submersibles@psubs.org
Subject: [PSUBS-MAILIST] Alec's fleet
Alec,
I'd say it was a LOT different if your original hull now displaces over two tons. And here's something else--if you bring a submarine all the way to the Keys again without calling me, then you'd better start looking for explosives strapped to your hull. That will be me in the distance with the radio detonator in hand.
Vance
-----Original Message-----
From: Alec.Smyth@compuware.com
To: personal_submersibles@psubs.org
Sent: Fri, 5 Jan 2007 10:57 AM
Subject: RE: [PSUBS-MAILIST] Thrust from a pump?
Vance,
That's a simple question with a long answer. I started out years ago building a
"flying" sub with the pilot in a prone position, a sort of poor man's Deep
Flight. I had it about 90% complete when Dale Heinzig decided to part with his
K-250 for health reasons, and I bought it. My reasoning was that a "flying" sub
and a conventional one were so different that they would be complementary, like
a plane and a helicopter. As soon as I got the K-250, however, it sucked up
every minute of my time in maintenance and improvements, so the flying sub went
on hold. That was not a bad thing, though, because experience driving the K boat
led me to reconsider the practicality of my earlier ideas. Let me summarize the
K-250 experience so far.
1) Winter #1: Total rebuild, including rather fundamental things like re-doing
the pressure hull welds.
2) Summer #1: Trip to Florida Keys. Sub worked great, but came back looking like
a salvaged WWII wreck (e.g. mechanical arm torn off in a grounding, electronics
shorted out due to humidity, much rust).
3) Winter #2: Total rebuild again, but this time focusing on maintenance
reducing enhancements. Lots of components redone in SS or plastic.
4) Summer #2: The maintenance oriented changes worked, and the sub was less
stressed because I stayed in fresh water. The just a couple of things fix this
winter.
At this point the K-250 reduction in maintenance allows me to finish off the
original sub, but due to the lessons learned it'n now a completely changed
design. No longer a "flying" sub but something more conventional and for two
people. The closest analogy is Lula, a Paul Moorehouse design, except of course
mine is very much smaller. It's similar in displacement to a K-350, though due
to the evolution of the design it's inherited a somewhat more elongated form.
cheers,
Alec
________________________________
From: owner-personal_submersibles@psubs.org <mailto:owner-personal_submersibles%40psubs.org> on behalf of vbra676539@aol.com <mailto:vbra676539%40aol.com>
Sent: Fri 1/5/2007 9:47 AM
To: personal_submersibles@psubs.org <mailto:personal_submersibles%40psubs.org>
Subject: Re: [PSUBS-MAILIST] Thrust from a pump?
Alec, Which submarine are we talking about here? Vance
-----Original Message-----
From: Alec.Smyth@compuware.com <mailto:Alec.Smyth%40compuware.com>
To: personal_submersibles@psubs.org <mailto:personal_submersibles%40psubs.org>
Sent: Fri, 5 Jan 2007 9:17 AM
Subject: RE: [PSUBS-MAILIST] Thrust from a pump?
About 4,500 lbs
________________________________
From: owner-personal_submersibles@psubs.org <mailto:owner-personal_submersibles%40psubs.org> <mailto:owner-personal_submersibles%40psubs.org <mailto:owner-personal_submersibles%2540psubs.org> >
on behalf of Rick and Marcia
Sent: Thu 1/4/2007 10:42 PM
To: personal_submersibles@psubs.org <mailto:personal_submersibles%40psubs.org> <mailto:personal_submersibles%40psubs.org <mailto:personal_submersibles%2540psubs.org> >
Subject: Re: [PSUBS-MAILIST] Thrust from a pump?
Alec, regarding water pumps, how heavy is your sub?
----- Original Message -----
From: "Smyth, Alec" <Alec.Smyth@compuware.com <mailto:Alec.Smyth%40compuware.com> <mailto:Alec.Smyth%40compuware.com <mailto:Alec.Smyth%2540compuware.com> >
>
To: <personal_submersibles@psubs.org <mailto:personal_submersibles%40psubs.org> <mailto:personal_submersibles%40psubs.org <mailto:personal_submersibles%2540psubs.org> >
>
Sent: Wednesday, January 03, 2007 2:20 PM
Subject: [PSUBS-MAILIST] Thrust from a pump?
I'm contemplating using water pumps as maneuvering thrusters (NOT for
main propulsion). Cousteau's socoupe used a hydraulic pump for the jets,
but I'd like to avoid that route if possible due to the excessive noise.
DC submersible pumps are convenient but I haven't found anything beefy.
I could try mating a trolling motor to a pump head. Submersible well
pumps look promising because they're very powerful yet compact, but they
require AC, and I don't think I can reverse them so I'd need four pumps
instead of two. I could of course hang trolling motors off the boat font
and back, but it really messes up the hydrodynamics of what can
otherwise be a quite clean design, and the props on my trolling motors
make them too large to duct into the MBTs.
Assuming I do settle on some kind of pump, the next question is how
strong it needs to be. Does anyone know how to translate GPM (or LPM)
into static thrust?
Any ideas or experiences would be much appreciated.
Thanks,
Alec
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