| Title: | SAILING |
| Notice: | Please read Note 2.* before participating in this conference |
| Moderator: | UNIFIX::BERENS |
| Created: | Wed Jul 01 1992 |
| Last Modified: | Mon Jun 02 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2299 |
| Total number of notes: | 20724 |
I keep reading about cruising boats hitting logs, containers and other
such things which are practically submerged.
What is wrong with moumnting a forward looking echo sounding
transducer, connecting it to your normal echo sounder. Then once in
cruise mode switch to the forward transducer and set the alarm.
Theoretically the only thing to set off the alarm would be something
solid ahead of the boat.
There must be something wrong with this scenario else others would have
done it long ago. Comments?
Axel
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1964.1 | Logs | SALEM::GILMAN | Tue Nov 17 1992 14:39 | 13 | |
Several things strike me as problems with the forward sonar.
1. Even if it did see something ahead how much warning would you
get? At best a few seconds I would think.
2. The transducer is very subject to damage at the bow, when coupled
with # 1 I wonder if it just plain isn't worth it.
3. A log would not draw much water, a small log, say 6 inch dia
which is quite capable of holing you would barely stick down enough
for the sonar to see the log.
Jeff
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| 1964.2 | Wood eye? | MILKWY::WAGNER | Scott | Wed Nov 18 1992 13:11 | 12 |
Add to the last list:
4. A waterlogged log looks a LOT like water to a sonar; wouldn't pick
it up.
5. Waves, it would pick up.
What we really need is energy-absorbing bumpers, and antiwhale bottom
paint.
Scott.
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| 1964.3 | Robin thinks it might work | AKOCOA::DOUGAN | Wed Sep 08 1993 14:56 | 13 | |
You read it here first! With due modesty I quote Robin Knox-Johnston
in Yachting World, September 1993:
"Some of the boats entered for this years Whitbread are planning to
fit forward facing echo sounders, which they hope will give advance
warning of a large mass in their path, but they are likely to run into
definition problems like clutter on a radar. The pitching of the boat
won't help either, as the sea's surface will give more spurious echoes.
It's still worth a try, though. If they do work, perhaps we can all
fit them and avoid hitting containers, logs and the assorted lumps of
debris which are floating about the oceans of the world."
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