Theoretical question - SailNet Community
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post #1 of 6 Old 07-06-2012 Thread Starter
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Theoretical question

I have been traveling up the iCW for the past few days and a question has been pestering me, so I thought I would put it out there and see what others think.

Many of the places that I have anchored recently experience substantial tide changes (8 feet +) and the associated current flowing. Typically I set a bow anchor and allow my boat to swing with the tide changes. The other night I considered setting both a bow and aft anchor to limit the swing as I have done previously in tight places.

The thought that occurred to me is this. I have never set an aft anchor in such significant current as I have been seeing lately and is it possible to cause damage to the engine if water is flowing swiftly past the aft of the boat? I am picturing the water forcing itself into the exhaust with enough force and volume to cause a problem.

Or maybe I just have too much time on my hands while at anchor to think up silly scenarios?

Thanks for your thoughts.

SV S.S.R.I
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post #2 of 6 Old 07-06-2012
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Re: Theoretical question

First, the exhaust is usually above the waterline or exits vertically so water would enter the exhaust. Second, I think, in strong current it will be hard to keep the stern pointing into the current. In my experience in strong reversing currents, both the aft anchor and the bow anchor are secured to the bow.
It is possible to put water into the engine via the exhaust but highly unlikely that it would happen in this scenerio.
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post #3 of 6 Old 07-07-2012
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Re: Theoretical question

There is a loop in the exhaust (not a vented loop) that goes way above the waterline. I would think there would need to be a lot of pressure to overcome that hurdle and push a columne of water through the muffler and up another hill to the mixing elbow. Extremely unlikely.

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post #4 of 6 Old 07-07-2012
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Re: Theoretical question

As ebs notes, setting two anchors from the bow is the way to go. Reduces swing and much less change of the anchor pulling out when the current changes.
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post #5 of 6 Old 07-07-2012
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Re: Theoretical question

Quote:
Originally Posted by Silvio View Post
is it possible to cause damage to the engine if water is flowing swiftly past the aft of the boat? I am picturing the water forcing itself into the exhaust with enough force and volume to cause a problem.
No more chance than on all the boats that sit in slips in areas with very high reversing current.
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post #6 of 6 Old 07-08-2012
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Re: Theoretical question

You might want to check if there is a vent in your exhaust loop, if there is, no problem...
Otherwise its theoretically possible to siphon water into the engine, however very unlikely.... like if the exhaust loop doesn't go very high above the waterline..

Otherwise just close the seacock on the exhaust.... and no worries, just to relax.
Just don't forget to reopen it
Greg
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