|
|
16-03-2011, 16:51
|
#1
|
Registered User
Join Date: Dec 2008
Location: Key West
Boat: Westsail 32 and Herreshoff 28
Posts: 1,161
|
Clearance under keel for hurricane anchoring?
How much room (water) do we need under our keels to weather a hurricane?
2 feet?
4 feet?
I know we should have as much as we can get but what should be the "minimum"?
I have a large shrimp boat anchor that I'd like to set but at my choice area I would hardly have 2 feet of water between my keel and the sand.
And then theres that darn "upright" fluke that would tickle my iron keel.
I have other areas of greater depth to consider, I would just like to be as shallow as can be safe.
Thanks
|
|
|
16-03-2011, 17:20
|
#3
|
Registered User
Join Date: Mar 2006
Location: Tampa Bay area, USA
Boat: Beneteau First 42
Posts: 3,961
|
Re: Clearance under keel for hurricane anchoring?
Quote:
Originally Posted by endoftheroad
How much room (water) do we need under our keels to weather a hurricane?
2 feet?
4 feet?
I know we should have as much as we can get but what should be the "minimum"?
I have a large shrimp boat anchor that I'd like to set but at my choice area I would hardly have 2 feet of water between my keel and the sand.
And then theres that darn "upright" fluke that would tickle my iron keel.
I have other areas of greater depth to consider, I would just like to be as shallow as can be safe.
Thanks
|
It kind'a depends upon which way the winds are expected to blow. On shore they'll be a major surge. Off shore, the water will be blow out. Each situation is different and depends upon where the center of rotation is with respect to your anchorage.
FWIW...
__________________
"It is not so much for its beauty that the Sea makes a claim upon men's hearts, as for that subtle something, that quality of air, that emanation from the waves, that so wonderfully renews a weary spirit."
|
|
|
16-03-2011, 17:40
|
#4
|
Registered User
Join Date: Sep 2009
Location: on board, Australia
Boat: 11meter Power catamaran
Posts: 3,648
|
Re: Clearance under keel for hurricane anchoring?
Would depend where you are anchoring.
In a mangrove creek hole would be OK however if exposed to waves as Boatman says.
|
|
|
16-03-2011, 17:40
|
#5
|
Moderator Emeritus
Join Date: Mar 2003
Location: Hayes, VA
Boat: Gozzard 36
Posts: 8,700
|
Re: Clearance under keel for hurricane anchoring?
As indicated there isn't a rule of thumb. The water level, may go up or down in any extreme and then the other way. That might be considered typical. Deeper water requires more rode. You may also face the debris being blown away from shore could collide with your boat and yet again if it comes back. Ain't no rules with hurricanes.
__________________
Paul Blais
s/v Bright Eyes Gozzard 36
37 15.7 N 76 28.9 W
|
|
|
16-03-2011, 17:48
|
#6
|
cat herder, extreme blacksheep
Join Date: Jul 2008
Location: furycame alley , tropics, mexico for now
Boat: 1976 FORMOSA yankee clipper 41
Posts: 18,967
|
Re: Clearance under keel for hurricane anchoring?
in 41 kt winds,we were slammed into a spoils bank thaT IS NORMALLY 2-3 FT DEPTH-- THE DEPTH OF THE TROUGHS BETWEEN THE 4 FT SEAS WAS ONLY 4 INCHES. did no favors for the boat. wasnt even a hurrycame.
|
|
|
16-03-2011, 17:49
|
#7
|
Registered User
Join Date: Aug 2009
Location: Michigan
Posts: 225
|
Re: Clearance under keel for hurricane anchoring?
Looks like you’re in the FL, Keys. Anything more than a 6 or 8 ft. surge is going to wreak havoc on any thing around you. That said 8’ ft. under the keel during those times SHOULD be OK but watch for your neighbors. If it’s a Cat. 1-2 or less you would probably be OK with less but do you want to chance it?
Sounds like you’re putting in a mooring, if not forget this post.
__________________
PATRIOTISM is supporting your country all the time AND your Government when it deserves it.
Mark Twain
|
|
|
16-03-2011, 18:01
|
#8
|
Registered User
Join Date: Jun 2009
Location: North Carolina, USA
Boat: Tartan 34C
Posts: 584
|
Re: Clearance under keel for hurricane anchoring?
Quote:
Originally Posted by endoftheroad
How much room (water) do we need under our keels to weather a hurricane?
2 feet?
4 feet?
I know we should have as much as we can get but what should be the "minimum"?
|
Minimum? 1 inch
Normal? Not applicable
Guarantee? Not available
John
|
|
|
16-03-2011, 18:17
|
#9
|
Registered User
Join Date: Dec 2008
Location: Key West
Boat: Westsail 32 and Herreshoff 28
Posts: 1,161
|
Re: Clearance under keel for hurricane anchoring?
Quote:
Originally Posted by knotnow
Looks like you’re in the FL, Keys. Anything more than a 6 or 8 ft. surge is going to wreak havoc on any thing around you. That said 8’ ft. under the keel during those times SHOULD be OK but watch for your neighbors. If it’s a Cat. 1-2 or less you would probably be OK with less but do you want to chance it?
Sounds like you’re putting in a mooring, if not forget this post.
|
I am setting a shrimp boat anchor and figure I may as well put it somewhere proper as it's getting time to start thinking about those things..
|
|
|
16-03-2011, 18:46
|
#10
|
Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
|
Re: Clearance under keel for hurricane anchoring?
To many variables to give any recommendation at all. Others have pointed out some of the issues but another factor will be which side of the eye you are on. If you are on the side with onshore winds and the tide is high then the water in your spot could be many feet deeper. If the eye passes so you are on the side with offshore winds and low tide a spot that is normally many feet deep could be mud.
Other factors, is your spot open in any direction so you could have a long fetch into your anchorage? Is it a close harbor or channel between two islands.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
|
|
|
16-03-2011, 19:35
|
#11
|
CF Adviser
Join Date: Oct 2007
Boat: Van Helleman Schooner 65ft StarGazer
Posts: 10,280
|
Re: Clearance under keel for hurricane anchoring?
There are other considerations when choosing anchor depth:
- The deeper the water the more effective the anchor chain catenary will be to act as a shock absorber in preventing break away loads.
- Much better to find a deep hole to drop the anchor so that you are dragging upwards in all directions, as the wind changes
|
|
|
17-03-2011, 07:21
|
#12
|
Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,139
|
Re: Clearance under keel for hurricane anchoring?
What's a "shrimp boat anchor"?
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
|
|
|
17-03-2011, 07:25
|
#13
|
Moderator Emeritus
Join Date: Jul 2010
Location: Key West & Sarasota
Boat: Cal 28 "Happy Days"
Posts: 4,210
|
Re: Clearance under keel for hurricane anchoring?
Quote:
Originally Posted by GordMay
What's a "shrimp boat anchor"?
|
A home built big ol' honking anchor... We're loaded with them in KW
__________________
Any fool with a big enough checkbook can BUY a boat; it takes a SPECIAL type of fool to build his own! -Capngeo
|
|
|
17-03-2011, 07:40
|
#14
|
Marine Service Provider
Join Date: Oct 2006
Location: Eastern Shore, MD
Boat: Camper Nicholson 44 Ketch
Posts: 2,060
|
Re: Clearance under keel for hurricane anchoring?
I thought it was an anchor for a really, really small boat....
Quote:
Originally Posted by capngeo
A home built big ol' honking anchor... We're loaded with them in KW
|
|
|
|
17-03-2011, 07:41
|
#15
|
Moderator Emeritus
Join Date: Jul 2010
Location: Key West & Sarasota
Boat: Cal 28 "Happy Days"
Posts: 4,210
|
Re: Clearance under keel for hurricane anchoring?
Quote:
Originally Posted by endoftheroad
How much room (water) do we need under our keels to weather a hurricane?
2 feet?
4 feet?
I know we should have as much as we can get but what should be the "minimum"?
I have a large shrimp boat anchor that I'd like to set but at my choice area I would hardly have 2 feet of water between my keel and the sand.
And then theres that darn "upright" fluke that would tickle my iron keel.
I have other areas of greater depth to consider, I would just like to be as shallow as can be safe.
Thanks
|
I've been through 4 hurricanes in KW, all in Garrison Bight. Wilma was the only one that had much surge. Where are you moored?
__________________
Any fool with a big enough checkbook can BUY a boat; it takes a SPECIAL type of fool to build his own! -Capngeo
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|
|