Salomon Fringe wrote in news:484cdba2$0$6032$ba620dc5
@text.nova.planet.nl:

(I need zero depth performance
for inland waterways). Does anybody know of a unit/brand/type that
would
work for me? I'm not interested in fish, just displaying depth.


You're asking for the impossible. The depth limit is determined by the
speed of sound and the pulse WIDTH (time) of the ping. A zero depth
would require a zero ping, which doesn't transmit anything. The other
problem is once the ping transmitter is shut off on a ping, it takes a
tiny amount of time for the receiver to come back on to listen for the
return from the ping, some latency is inevitable.

So, you want the shortest ping time unit with the fastest response you
can get to that ping.....and they're all about the same, mostly useless
under 2 ft. of depth, right where everyone needs it.

What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles. A couple of stiff wires that
would protrude down into the water 3 ft from the BOW that would make an
awful griding noise like the curb feelers did through the hull alerting
us the expensive lower unit was about to be torn off by the bottom
rocks...while we're feeling our way along through the shallows....we
shouldn't be in in the first place.

The feelers would be spring loaded and fly back along the hull at speeds
above no wake speeds.

Just for reference, I find the depth sensed by the simplest of depth
meters so close to the bottom is much better than the "fish finders" with
their charting displays. But, the charting display gives you some
instant idea of whether we're getting shallower or deeper and how fast so
you can turn away or back....

On Mon, 09 Jun 08, Larry wrote:
What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles.

On a sailboat, that's called a centerboard or swing keel.

Rick

lid wrote in news:cior44h1c8m8672ml387rb0cm33rjkqb3h@
4ax.com:

On a sailboat, that's called a centerboard or swing keel.

Rick



On many sailboats, it's called the FIXED KEEL. It's our big curb feeler...
(c;

On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote:

What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles. A couple of stiff wires that
would protrude down into the water 3 ft from the BOW that would make an
awful griding noise

Such devices exist.

They are frequently called propellers.

Wayne.B wrote in
:

On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote:

What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles. A couple of stiff wires that
would protrude down into the water 3 ft from the BOW that would make an
awful griding noise

Such devices exist.

They are frequently called propellers.


When they grow up on steroids, we call them "screws", which make contacting
the bottom with them MUCH more exciting!

On Wed, 11 Jun 2008 03:16:09 +0000, Larry wrote:

Wayne.B wrote in
:

On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote:

What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles. A couple of stiff wires that
would protrude down into the water 3 ft from the BOW that would make an
awful griding noise

Such devices exist.

They are frequently called propellers.


When they grow up on steroids, we call them "screws", which make contacting
the bottom with them MUCH more exciting!

At 30 inch diameter are they props or screws? At $4k each I don't
think I could handle much more excitement.

Wayne.B wrote:
On Wed, 11 Jun 2008 03:16:09 +0000, Larry wrote:

Wayne.B wrote in
:

On Mon, 09 Jun 2008 19:24:42 +0000, Larry wrote:

What I always thought we needed was a sort of underwater "curb feeler"
like we used to put on the pimpmobiles. A couple of stiff wires that
would protrude down into the water 3 ft from the BOW that would make an
awful griding noise
Such devices exist.

They are frequently called propellers.

When they grow up on steroids, we call them "screws", which make contacting
the bottom with them MUCH more exciting!

At 30 inch diameter are they props or screws? At $4k each I don't
think I could handle much more excitement.

At $4k they are called screws, as in, If you break one, you are screwed.

Wayne.B wrote in
:

At 30 inch diameter are they props or screws? At $4k each I don't
think I could handle much more excitement.


I'd call them screws.....

On Jun 12, 11:47*am, Larry wrote:
Wayne.B wrote :

At 30 inch diameter are they props or screws? *At $4k each I don't
think I could handle much more excitement.

I'd call them screws.....

The crabbers and fisherman in Alaska call them wheels.

wrote:
On Jun 12, 11:47 am, Larry wrote:
Wayne.B wrote :

At 30 inch diameter are they props or screws? At $4k each I don't
think I could handle much more excitement.
I'd call them screws.....

The crabbers and fisherman in Alaska call them wheels.


Saw that on teevee, did ya?