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Old 18-04-2011, 09:04   #31
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Re: Your Thoughts on Floating Debris Avoidance?

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Originally Posted by capn_billl View Post
If someone wanted to make some money a good forward looking "collision" sonar that looks from waterline to bottom of keel would be a good thing.
They're out there, but expensive and not exactly getting rave reviews.

Interphase vs Echo Pilot Forward-Looking Sonar
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Old 18-04-2011, 09:26   #32
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Re: Your Thoughts on Floating Debris Avoidance?

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They're out there, but expensive and not exactly getting rave reviews.

Interphase vs Echo Pilot Forward-Looking Sonar
Whether they work well or not for telling you bottom contours coming up what I can't see them working for is as an anticollision device. Most things will be too shallow to not disappear in the waves. Maybe they would warn you of an 8' deep shipping container.

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Old 19-04-2011, 07:46   #33
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Re: Your Thoughts on Floating Debris Avoidance?

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Originally Posted by rebel heart View Post
They're out there, but expensive and not exactly getting rave reviews.

Interphase vs Echo Pilot Forward-Looking Sonar
No good for floating objects. Neither good in a heeled boat going in the open waters.

I think a collision avoidance thing would be difficult to build except perhaps with military type of money. Objects floating just under surface are super difficult to detect by echo in normal sea conditions.

However, since the dangerous debris could often be large metal objects (containers, barrels, etc.), perhaps a sort of short range 'downward-looking' radar could be built. (?)

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Old 19-04-2011, 08:05   #34
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Re: Your Thoughts on Floating Debris Avoidance?

That's certainly possible, but how you would tune the thing to discriminate between a wave top, a pair of seabirds, a tree branch and the corner of an awash shipping container hovering one foot below the surface is beyond my technical ken.
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Old 19-04-2011, 09:25   #35
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Re: Your Thoughts on Floating Debris Avoidance?

Looks like our summer cruse from the Columbia River to the Strait of Juan d Fuca will be mostly clear of debris this year but next year and the next will be day light sailing only on the WA coast. I did hear that the US Coast Guard is taking measures to clean up some of the big debris to keep shipping channels ( 10 miles off shore ) clear of stuff. I wonder if the debris field will attract different types of fish than normal ( like sharkes )which we really don't see in the Pacific NW.
I'm glag our rudders swing up if they bump anything and with our cat 18 inches of clearence hopefully we'll scoot across most debris that is submerged.
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Old 19-04-2011, 09:44   #36
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Re: Your Thoughts on Floating Debris Avoidance?

if i hit a house, can i keep it???? or A NICE OLD Z CAR???/
that would be nice, but i think cars will have sunk by the time should get here.....and i think houses wont look like much by the time they ge there---- yeah we may have some stuff- but i think that wont be as bad as predicted-- the journalists have grown very sensationalistic of late.
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Old 19-04-2011, 11:39   #37
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Re: Your Thoughts on Floating Debris Avoidance?

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Originally Posted by rebel heart View Post
They're out there, but expensive and not exactly getting rave reviews.

Interphase vs Echo Pilot Forward-Looking Sonar
I have the interphase, it warns of aproaching bottom, but at the highest setting it looks down 15 - 20 degrees, even an 8' deep shipping container wouldn't be picked up until you are right on it. An object that is flat like the deck I ran over, it beeped right about the time I hit it. It wouldn't see something like a barrel until it rolled under the sensor.
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Old 28-04-2011, 00:55   #38
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Re: Your Thoughts on Floating Debris Avoidance?

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Get a geiger counter - depending on wind direction will give you advance warning of Japanese debris
I hope that you can tell me where to get that geiger counter so that I would know it. Also the direction of how to use it. Thanks.
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Old 28-04-2011, 04:02   #39
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Re: Your Thoughts on Floating Debris Avoidance?

The problem with forward looking sonar is that the surface water (6ft) is aerated too much for it to work. Shame. My bro does naval sonar and explained patiently when I asked about hearing/avoiding the big ships when solo night sailing/sleeping.
I remember the Ceylon tsunami debris caused a member here to lash oars to each bow to protect them against the heavier stuff in his plastic cat.
As a Prout Fanatic you'll note that all forward edges are designed to press debris down and under, including the keel, and the prop is nominally protected by it drive leg (outboard style).
Some of the vertical stemmed hulls aren't going to enjoy bouncing over logs or containers. The forward crash cells do need to be properly isolated from the boat interior. Top (deck) access for bulky but light storage is fine if they have a pipe that allows them to be sounded and pumped dry regularly.
The thro hull instruments are particularly prone to damage from beach or debris. Consider where your leak alarm is and add another in the box that traps and contains the 5 litre leaks you get when cleaning/changing the instruments. That's the right place to put your sink outlets too just in case they leak slowly. Keeping the thro hulls together saves hassle when they go wrong, just allow plenty of working space.
And do remember to contact the rescue frequency and offer assistance with search, support and transport if you are in a disaster area. Nothing much is working, most boats are lost or damaged, you've got a vital asset if you are still floating.
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Old 28-04-2011, 10:30   #40
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Re: Your Thoughts on Floating Debris Avoidance?

I might be able to pick up a giger counter from my old work area ( Handford nuclear site Wa state, the Manhatten Project Area 20 of miles upstream from my moorage) to carry with us as we cruse the WA coast. I guess I could mount 2 of them on the bows of our catamaran as we cruse.

Looks like sailing to Hawaii from Seattle might be a bumpy ride for the next several years if you have a heavy steel boat.
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Old 28-04-2011, 10:37   #41
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Re: Your Thoughts on Floating Debris Avoidance?

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Originally Posted by David_Old_Jersey View Post
Get a geiger counter - depending on wind direction will give you advance warning of Japanese debris
I think you are far more likely to pick up an indication of what the US piled up on Johnston Atoll ...

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Old 28-04-2011, 10:39   #42
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Re: Your Thoughts on Floating Debris Avoidance?

Where's that at?
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Old 28-04-2011, 12:08   #43
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Re: Your Thoughts on Floating Debris Avoidance?

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Where's that at?
16 45 N x 169 31 W,
717 NM southwest of Honolulu,
about one-third of the way from Hawaii to the Marshall Islands.

Johnston Atoll was used for high altitude nuclear tests in the 1950s and 1960s, and until late in 2000 the atoll was maintained as a storage and disposal site for chemical weapons.
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Old 29-04-2011, 10:04   #44
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Re: Your Thoughts on Floating Debris Avoidance?

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16 45 N x 169 31 W,
717 NM southwest of Honolulu,
about one-third of the way from Hawaii to the Marshall Islands.

Johnston Atoll was used for high altitude nuclear tests in the 1950s and 1960s, and until late in 2000 the atoll was maintained as a storage and disposal site for chemical weapons.
I now recognize the Marshall Islands as a waste site and all the excess waste is barried at Handford Wa just 20 miles up the road from where we are moored. I was one of the USA Cold War Patriot's who worked on decomisioning of the enrichment for the bombs used in Japan and the Marshall islands.
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Old 29-04-2011, 10:40   #45
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Re: Your Thoughts on Floating Debris Avoidance?

As I posted yesterday, will mention again: There are literally hundreds of uprooted trees, brush, and everything else that accumulated beside the river for the last century presently floating down the Hudson as we speak. The river reached all-time high levels by a country mile in the last 24 hours. The NYS lock system opens up May 1 out of Champlain. The Champlain canal (if it can open)and the lower Hudson to NYC will be a minefield of some very large logs for a while . Anyone navigating the Hudson and outside over to Sandy Hook, out the channel needs to keep their eyes peeled for all kinds of crap in the water.
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