Reply
 
Thread Tools Search this Thread
 
Old 03 February 2008, 14:11   #11
Member
 
Country: UK - England
Town: cookoo land
Boat name: tba
Make: ribcraft 595
Length: under 3m
Engine: Suzi 140
Join Date: Sep 2007
Posts: 316
The answer is.....

The answer is of course.........'it all depends'!

3-5x depth, given a good length and weight of chain should do the trick in most condidtions. Obviously, the chain element of the rode is probably responsible for 50% of the anchor effectiveness. I tend to carry 20m if 'lighter' chain if going offshore, to keep weight in the boat down without sacrificing too much anchoring power.

Will also sometimes carry 2 anchors. General allrounder like bruce or danforth and a grapnel for any rocky bottoms or as a spare.

The safety element of anchoring is not to be under estimated of course. I will always encourage students to consider anchoring as a primary means of keeping themselves out of trouble in the event of engine failure, particularly in large busy harbours. As such, I would recomend keeping you anchor and rode to hand at all times in a bucket or similar, as near to helming position a s possible. If your bow line, attached to your D ring on the stem, is also lead back to the helm area, then you should be able to connect and deploy the anchor in a matter of seconds. Carbines or caribiners can also be used for a quick method of attachment, but shouldn't be relied on long term.
__________________

__________________
BassBoy is offline   Reply With Quote
Old 03 February 2008, 14:14   #12
Member
 
Country: UK - England
Town: cookoo land
Boat name: tba
Make: ribcraft 595
Length: under 3m
Engine: Suzi 140
Join Date: Sep 2007
Posts: 316
weight v length

Codds

The length of chain shouldn't be underestimated due to the catenary effect.
__________________

__________________
BassBoy is offline   Reply With Quote
Old 03 February 2008, 14:14   #13
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
I also carry a sea anchor - anyone else carry them? I purchased on designed for 15m yachts but it's so small when rolled up it's not a problem. Have yet to use it though!!! Can also be used as a drogue.
__________________
codprawn is offline   Reply With Quote
Old 03 February 2008, 14:15   #14
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by BassBoy View Post
Codds

The length of chain shouldn't be underestimated due to the catenary effect.
Yes but surely an angel at the right position will have almost the same effect?
__________________
codprawn is offline   Reply With Quote
Old 03 February 2008, 14:24   #15
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally Posted by codprawn View Post
Yes but surely an angel at the right position will have almost the same effect?
Bugger all if it's blowing a hoolie.
__________________
JW.
jwalker is offline   Reply With Quote
Old 03 February 2008, 14:51   #16
Member
 
Country: UK - England
Town: cookoo land
Boat name: tba
Make: ribcraft 595
Length: under 3m
Engine: Suzi 140
Join Date: Sep 2007
Posts: 316
Catenary

Codds
I'm no architect but have a look at 'catenary' on wikipedia, particularly "anchoring of marine vessels"

BB
__________________
BassBoy is offline   Reply With Quote
Old 03 February 2008, 15:04   #17
Member
 
Paul Glatzel's Avatar
 
Country: UK - England
Town: Poole
Length: 6m +
Join Date: May 2000
Posts: 406
Returning to Jono's original observation both Start Powerboating & The RYA Powerboat Handbook advocate 6x as a recommendation to deploy in respect of mixed chain/warp.

By advocating 6x then this is an amount likley to deal with most scenarios, as a skipper if you assess all of the relevant factors and choose to deploy less then that's fine - indeed that's what I do when appropriate. To have advocated less as the default amount would have been wrong.

Regards

Paul
__________________
Paul Glatzel
Powerboat Training UK, Poole & Lymington & Aquasafe Powerboat School, Lymington

www.powerboat-training-uk.co.uk, www.aquasafepowerboatschool.co.uk
Paul Glatzel is offline   Reply With Quote
Old 03 February 2008, 15:08   #18
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Quote:
Originally Posted by BassBoy View Post
Codds
I'm no architect but have a look at 'catenary' on wikipedia, particularly "anchoring of marine vessels"

BB
Yes I do understand the principles.............

"the catenary curve given by the weight of the rode presents a lower angle of pull on the anchor or mooring device."

Which can also be replicated by hanging a heavy weight on the line which has the same effect of keeping the pull as horizontal as possible.
__________________
codprawn is offline   Reply With Quote
Old 03 February 2008, 15:26   #19
Member
 
Country: UK - England
Town: cookoo land
Boat name: tba
Make: ribcraft 595
Length: under 3m
Engine: Suzi 140
Join Date: Sep 2007
Posts: 316
Codds,
Yup.
BB
__________________
BassBoy is offline   Reply With Quote
Old 03 February 2008, 18:11   #20
RIBnet supporter
 
Country: UK - Scotland
Town: West of Scotland
Make: humber
Length: 5m +
Engine: 90
Join Date: Nov 2007
Posts: 92
from the original Jono conversation, I'd be thinking of the following;

what is if you are really going to use a anchor for in the vast majority of boats folk think of when looking at level 2 etc. ; and then consider what you need maybe? :-)
__________________
eilean mor is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 04:46.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.