Re: [PSUBS-MAILIST] Sound Absorption

["Dan H." <jmachine@adelphia.net>]

Marten,

My K-350 is 3 feet in diameter and luckily, I'm a little guy, 5'-6".   There
is enough room for me to operate the sub with my head in the conning tower
but it's tight when working on things inside the hull.  A hull 3'- 6" in
diameter would be better but the trade off is it's gets heavier to trailer
around.  You might want to reconsider your five foot diameter design because
of it's weight.  Remember it has to be heavy enough to dive.  If your not
going to transport it, displacement isn't as much an option.

Dan H.
----- Original Message -----
From: "Marten Liebster" <mliebster@tbteam.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, April 29, 2004 10:05 AM
Subject: RE: [PSUBS-MAILIST] Sound Absorption


> Steven & Dan,
>
> Thanks for your responses and pointers. My sub is in the concept stage,
I'm
> reviewing different ideas and learning what's doable and not. I'm a fairly
> big guy - 6'5" - so I'd like my pressure hull to be at least 5 feet in
> diameter.
>
> For a living I am a programmer and my experience in fabrication is purely
> wood working. So the thought of through hull propulsion is a bit scary for
> me. However, having hydraulic connections pass from the interior to the
> exterior seems much easier to implement.
>
> As a result, I am planning to use hydraulic propulsion, I do realize it's
> not as efficient as an electric motor. This is the reason for my asking
the
> original question, I'll have a pump running all the time. I anticipate
that
> with not much to absorb sound and with the shape of the hull, that would
get
> really annoying.
>
> Marten
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan H.
> Sent: Wednesday, April 28, 2004 10:29 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Sound Absorption
>
> Marten,
>
> I haven't got me sub wet yet but the thrusters are up and running.  My
three
> thrusters are in pods on the exterior of the hull.  Of course I can hear
> them in the sub but they're not loud.  If you had a hydraulic pump running
> all the time I'm sure that would get annoying.
>
> I like the idea of hearing noises through the hull.  You can't see
> everything around you all the time.  Hearing a noisy boat in your vicinity
> before you surface is a good thing!
>
> Besides, sound abatement materials against the hull is a place to trap
> moisture.
>
> Dan H.
>
> BTW. "Persistence" is now yellow.  I finished the paint job last week.
> Tomorrow the trailer will be blue.
>
>
> ----- Original Message -----
> From: "Marten Liebster" <mliebster@tbteam.com>
> To: <personal_submersibles@psubs.org>
> Sent: Wednesday, April 28, 2004 2:50 PM
> Subject: [PSUBS-MAILIST] Sound Absorption
>
>
> >
> > Hi,
> >
> > I am in the initial process of designing a psub, my first. The web
> > site
> and
> > mailing list have to proven to be chock full invaluable information to
me.
> > One thing that I haven't seen much about (perhaps I'm searching on the
> wrong
> > keywords) is that of sound absorption.
> >
> > I'd imagine that a psub could be a noisy place, with all of the
> > motors, pumps, hydraulic and other equipment. It seems to me the hull
> > would
> reflect
> > back the sound waves, it being bare metal in a tube-like shape.
> >
> > Questions:
> > Is your psub a noisy place?
> > Do you use anything on the hull to absorb the sound?
> >
> > Thanks,
> > Marten Liebster
> > A psub newbie
> >
> >
>
>
>
>