Carsten a microphone what a great idea. I was thinking of some sort
of a wet sensor.
I knew there was a good reason to keep you around
hehheh
Dean
In a message dated 2/8/2009 12:17:49 P.M. Central Standard Time,
MerlinSub@t-online.de writes:
Just for
the protokoll: We sunk our boats (Nemo and Sgt.Peppers) on a rope.
We
add a cable wire for a camera with microfone and found out that the microphone
was really helpfull - you hear any drop of water..
Both
boats in ballast and to be just 1-5 kg to heavy. We flooded the softtanks from
outside. On our boats the softtanks have a outside tread to add a
ballvale.
On the bottom we blow the ballst tanks via a pressure hose
connetecd this open ballvale and a scuba bottle with reducer.
We
did the job from a really small inflatble boat with no space and bouancy for a
winch job.
But the way with the pressure hose is only common for deeps
up to 300 feet or so - depents on you pressure hose and the pressure
reducer.
vbr carsten
"Dan H." <Jumachine@comcast.net>
schrieb: > > Dean, > > It was a windy day when we
did the unmanned deep water test on my sub. First off, the wind kept us
drifting down the lake. Second, the water was choppy from the wind and
the sub was on a nylon line. At 540 ft it had some stretch to it.
These factors made us need to keep an even pull upward, no matter if the sub
was moving or not. One person could pull on the line but it took two to
make progress because of the elastic nature of the pull. We would both
pull, then one hold and the other get a grip farther down then repeat.
With the elastic line we couldn't even tell if we were actually hauling sub or
just stretching line. When we got fifty feet or so pulled up we figured
we must be moving the sub. It's difficult to estimate resistance.
We were fighting so many forces that also includes inertia of the moving sub
with out tugs on the line, the weight we had to over come and the water
flowing around the hull. > > The original plan was, the sub was
to be weighted 30 pounds heavy with expendable drop weights that were to be
released by puling on a second smaller line. That was attached to a
release pin on top of the sub. I figured, even if the lines wrapped
around a bit, one would still slide by the other. That didn't
happen! > > We had to hand haul up to about half way, then unwrap
three twists in the line. After that we pulled the pin and waited till
the sub surfaced. Let me tell you.... It was a great sight to see
that yellow hatch break the surface! > > If I was to do it again,
I'd use a electric weight release and send down two wires with the nylon
hauling line. That way wrapped wires and line wouldn't be a
problem. Or have a winch on the surface boat capable of 600 feet of
line. > > Dan H > ----- Original Message -----
> From: Recon1st@aol.com > To:
personal_submersibles@psubs.org > Sent: Saturday, February
07, 2009 9:28 AM > Subject: Re: [PSUBS-MAILIST] safety
chain > > > Dan good thought on a com wire. It
sure would be better. > Do you have an estimate of how much
water resistance you encountered. > I guess not a lot if you
were able to hand haul it up. > > Was that the plan
to begin with or a SNAFU? > > This spring I will be
installing a winch on my surface boat. > >
Dean > > In a message dated 2/6/2009 8:57:27 P.M.
Central Standard Time, Jumachine@comcast.net writes: >
Dean, Frank > > I don't have a
float system on my sub but have given one some thought. It would be
pretty difficult to have a cable on the sub capable of lifting the subs weight
flooded. Mine was just about 30 pounds negative when we tested it on a
line and had to hand pull it up from 540 feet. Al Secore probably still
is walking bent over. Thirty pounds heavy, in rough water, with the
resistance of the water flowing around the sub as it rises is a lot more then
thirty pounds hanging on a hook in the shop. Any cable would have to
have a reasonable safety factor for rough conditions. >
> Also, having a way to communicate with the trapped
sub would be nice for the folks on both ends. I was thinking of making
my float pull up a wire pair from a spool on the sub. It could be used
with equipment you surface crew can carry for emergency communications and
also serve as a guide to send help down to you. > >
Your surface support crew can carry a latch mechanism that is
designed to mate with a mushroom shaped pin on top of your sub. If the
emergency alert line emanates from the top of the mushroom, your latch
mechanism can be threaded on the wire at the surface and slide down till it
hits the top of the sub and latches. Of course you first need to attach
a strong cable to the latch before you let it down. The big question is,
will there be a winch heavy enough and a cable long enough available but you
need the winch no matter how you do it. > > We
used to use a similar system to retrieve rock core samples from a drill tube
instead of pulling up the entire drill string. The latch was sent down
the drill pipe till it hit a mushroom pin on top of the core barrel. It would
catch and you started hauling it up. > >
I like the idea of wires to communicate through. >
> Dan H. > -----
Original Message ----- > From:
ShellyDalg@aol.com > To:
personal_submersibles@psubs.org > Sent:
Thursday, February 05, 2009 2:36 PM > Subject:
Re: [PSUBS-MAILIST] safety chain > > >
Hi Dean. I think an 1/8 inch is way too small. We discussed this
last year and it's a good idea to have the ability to pull the sub up, but
carrying a spool/cable assembly on board will require a pretty heavy
set-up. >
One idea tossed around back then was a float and cable like you
had planned, but the cable is used as a guide for lowering a "clamp" that
would be capable of attaching to the sub to pull it up. That way the heavy
"clamp" is carried on board the surface craft where it's not exposed to sea
water, doesn't add any weight to the top of the sub, and can have a thick
cable strong enough to pull the sub free from mud or minor entanglement. Just
lifting the sub alone may not be enough if it's in the mud or hung up on
something. > It should be pretty
easy to fabricate some type of "hook and latch " device that the clamp can
drop onto ( guided by the float/cable ) and then be able to pull really hard
if the sub got stuck. An 1/8th inch cable would then be enough if used as a
guide. Frank D. > > >
-------------------------------------------------------------------------- >
Great Deals on Dell Laptops. Starting at $499. >
> >
------------------------------------------------------------------------------ >
Who's never won? Biggest Grammy Award surprises of all time on AOL
Music.
************************************************************************ ************************************************************************ ************************************************************************ The
personal submersibles mailing list complies with the US Federal CAN-SPAM
Act of 2003. Your email address appears in our database because
either you, or someone you know, requested you receive messages from our
organization.
If you want to be removed from this mailing list simply
click on the link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address
from this mailing list occurs by an automated process and should be
complete within five minutes of our server receiving your
request.
PSUBS.ORG PO Box 53 Weare, NH
03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
Who's never won? Biggest Grammy Award surprises of all time on AOL Music.
|