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I partially concur with David.
I read the instructions on a fish finder & it said
that it located fish via the bubble in the swim bladder.
So "JAWS" wouldn't show up cause he doesn't have a swim
bladder. I doubt wether any fish come to the surface to fill their
swim bladder though. The submarine may show up as a
rock on the bottom or a reef.
I have only had experience with cheap fish finders &
have questions about their reliability,
as the many fish showing under the boat haven't always
translated to bites or fish on the table.
Alan
----- Original Message -----
Sent: Monday, March 15, 2010 2:39
PM
Subject: RE: [PSUBS-MAILIST] Desert Star
Sport
Frank,
Although the steel of the sub
would give a great return, its actually the air within the sub that shows up
best...in fact...
Fish use less energy when
neutrally buoyant. For this reason most fish go to the surface and gulp small
bubbles of air to stay this way. It is this small bubble of air that is so
easily seen by fish finders and really not the fish themselves. The bigger the
fish, the bigger this gulped bubble of
air.
David
Bartsch
From: ShellyDalg@aol.com
Date: Sun, 14 Mar 2010 18:51:09 -0400
Subject:
Re: [PSUBS-MAILIST] Desert Star Sport
To:
personal_submersibles@psubs.org
In a message dated 3/14/2010 3:29:50 P.M. Pacific Daylight Time,
hc.fulton@gmail.com writes:
I
think it would be worth trialing.
Some of the psubs I've seen have a little "fish finder" on them, mostly
to show bottom profile and depth.They work on the "slice" method and the
profile is a "built-up" picture from several signals. I think the side scan
device is the same except looking sideways, Right ? Don't they take a "slice"
and by adding all the slices together a picture is generated showing the
echo's.
I know a regular "fish finder" can be had pretty cheaply, although like
every thing, you get what you pay for. A friend has one that he paid $30 for.
Not too fancy but it definitely shows fish from his little boat, and a bottom
profile. It seems to me that he said it has a maximum depth reading of 300
feet. Like I said it's a cheap one and the screen on it is only about 3" X 4".
He uses it off the coast here and the water gets deep pretty quick but he can
tell when the bottom drops away like over a shelf, can see big boulders,
gullies, and of course fish if there's a big one or several in a school. He's
got enough experience with it that he can tell if it's kelp or rocks etc.
A steel sub should be easy if you know how to interpret the
picture.
Frank D.
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