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-   -   How do I calculate minimum pullout force needed? (http://www.sailnet.com/forums/general-discussion-sailing-related/72747-how-do-i-calculate-minimum-pullout-force-needed.html)

flipdoc 03-12-2011 04:10 PM

How do I calculate minimum pullout force needed?
 
Can anybody give me some guidance on how to calculate what the minimum pullout force of a system should be for a given boat. Mine is a Bristol29.9.

The original displacement was 8650lb. I would like to install a system that will securely anchor my boat in a protected bayou, but it is the Emerald Coast area of FL, so prone to hurricanes, although a storm surge is more frequent in this area (Panama City).

bljones 03-12-2011 04:53 PM

Attractiveness of partner x # of drinks consumed/ time of ovarian cycle + your net income squared - the value of your boat cubed.

Or just wear a condom, and you never have to worry about pulling out.

RichH 03-12-2011 05:48 PM

Quote:

Originally Posted by flipdoc (Post 708159)
Can anybody give me some guidance on how to calculate what the minimum pullout force of a system should be for a given boat. Mine is a Bristol29.9.

The original displacement was 8650lb. I would like to install a system that will securely anchor my boat in a protected bayou, but it is the Emerald Coast area of FL, so prone to hurricanes, although a storm surge is more frequent in this area (Panama City).

Contact your insurance carrier ... as they should have all the 'historical' data and recommendations for such forces and methods to prevent.

pdqaltair 03-12-2011 06:53 PM

Not that asking your insurance is unsound; I think that is a very good idea.

However, the AYBC anchor guidelines are listed on the below post, as well as some other means of estimating storm loads ("Tuning and Anchor Rode").

Sail Delmarva: Drogue and Parachute Sea Anchor Testing: A Summary for Small to Medium Cruising Catamarans

And certainly, in Florida, this is one item when going to the next size, when in doubt, is expected. Hurricanes are something else (I managed a facility that was RIGHT in front of Katrina in NOLA).

klem 03-12-2011 08:17 PM

I would suggest taking a look at this website. It is set up for anchors but the same formulas apply for moorings, the major difference being the scope used. Keep in mind that you need to take in the specifics of your situation. Any wave action will greatly increase shock loading. Additionally, how well your boat sits to an anchor (how much it veers back and forth in high wind) plays a big role as well. You can never have too large of an anchor and it is always nice to have a generous safety factor.

Forces


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