Theoretical question - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
 Not a Member? 


Like Tree2Likes
  • 1 Post By SVAuspicious
  • 1 Post By Mantus Anchors
Reply
 
LinkBack Thread Tools
  #1  
Old 07-06-2012
Silvio's Avatar
Battered and Bruised
 
Join Date: Nov 2010
Posts: 482
Thanks: 0
Thanked 5 Times in 4 Posts
Rep Power: 4
Silvio is on a distinguished road
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
It's my happy pill
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #2  
Old 07-06-2012
ebs001's Avatar
Senior Member
 
Join Date: May 2006
Location: Ottawa, Canada
Posts: 2,034
Thanks: 4
Thanked 16 Times in 14 Posts
Rep Power: 8
ebs001 is on a distinguished road
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.
Reply With Quote Share with Facebook
  #3  
Old 07-07-2012
Gladrags1's Avatar
Sailor
 
Join Date: Apr 2003
Location: Rock Creek, Maryland
Posts: 462
Thanks: 9
Thanked 5 Times in 5 Posts
Rep Power: 12
Gladrags1 is on a distinguished road
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.
__________________
Mandolin
Bayfield 36
Sailing out of Rock Creek, Chesapeake Bay
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #4  
Old 07-07-2012
JimsCAL's Avatar
Senior Member
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,180
Thanks: 0
Thanked 13 Times in 12 Posts
Rep Power: 7
JimsCAL is on a distinguished road
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.
Reply With Quote Share with Facebook
  #5  
Old 07-07-2012
SVAuspicious's Avatar
Mermaid Hunter
 
Join Date: Oct 2006
Location: on the boat - Chesapeake
Posts: 2,668
Thanks: 0
Thanked 36 Times in 27 Posts
Rep Power: 8
SVAuspicious will become famous soon enough
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.
Silvio likes this.
__________________
sail fast and eat well, dave
S/V Auspicious
AuspiciousWorks.com
beware "cut and paste" sailors.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #6  
Old 07-08-2012
Mantus Anchors's Avatar
Senior Member
 
Join Date: Dec 2011
Posts: 163
Thanks: 4
Thanked 0 Times in 0 Posts
Rep Power: 3
Mantus Anchors is on a distinguished road
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
Silvio likes this.
__________________
Anchor Purveyor
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Simple question, but still a question:keel repair eckcn17 Gear & Maintenance 9 03-16-2011 11:01 AM
The $64,000.00 question Maverick1958 Cruising & Liveaboard Forum 12 02-01-2010 11:47 AM
c&c 30 mki a,b,c,etc.. question Csobanc Boat Review and Purchase Forum 1 01-28-2010 08:11 PM
To cut or not to cut, that is the question Omatako Seamanship & Navigation 44 03-28-2009 05:54 PM
Keel/ballast Question?? Plus Extra Credit Question ;) stephenronning General Discussion (sailing related) 2 03-20-2009 07:25 AM


All times are GMT -4. The time now is 09:58 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012