T&T: Anchor,chain,rope specs and use - wind speed/force table
Bob McLeran
rmcleran@ix.netcom.com
Fri Apr 20 09:23:41 EDT 2007
Here's a copy of a spreadsheet with figures for various wind speeds and
areas (originally posted by Capn Wil Andrews). You'll need to copy and
paste it into a document with fixed fonts and then add some spaces in
order to arrange the columns properly. The formula used is at the bottom
of the tables.
Cd = 0.70 (Sail
Boats)
WIND SPEED IN KNOTS
----->
Sq Ft | 10 20 30 40 50 60 70 80 90
100 110 120 130 140 150 Sq Ft
50 | 12 47 107 190 297 427 581 759 961
1186 1436 1709 2005 2326 2670 50
75 | 18 71 160 285 445 641 872 1139
1442 1780 2153 2563 3008 3488 4004 75
100 | 24 95 214 380 593 854 1163 1519
1922 2373 2871 3417 4010 4651 5339 100
125 | 30 119 267 475 742 1068 1453 1898
2403 2966 3589 4271 5013 5814 6674 125
150 | 36 142 320 570 890 1281 1744 2278
2883 3559 4307 5126 6016 6977 8009 150
175 | 42 166 374 664 1038 1495 2035 2658
3364 4153 5025 5980 7018 8139 9344 175
200 | 47 190 427 759 1186 1709 2326 3037
3844 4746 5743 6834 8021 9302 10678 200
225 | 53 214 481 854 1335 1922 2616 3417
4325 5339 6460 7689 9023 10465 12013 225
250 | 59 237 534 949 1483 2136 2907 3797
4805 5932 7178 8543 10026 11628 13348 250
275 | 65 261 587 1044 1631 2349 3198 4176
5286 6526 7896 9397 11029 12790 14683 275
300 | 71 285 641 1139 1780 2563 3488 4556
5766 7119 8614 10251 12031 13953 16018 300
325 | 77 308 694 1234 1928 2776 3779 4936
6247 7712 9332 11106 13034 15116 17353 325
*************************************************************
Cd = 1.00 (Power
Boats)
WIND SPEED IN KNOTS
----->
Sq Ft | 10 20 30 40 50 60 70 80 90
100 110 120 130 140 150 Sq Ft
50 | 17 68 153 271 424 610 831 1085
1373 1695 2051 2441 2865 3322 3814 50
75 | 25 102 229 407 636 915 1246 1627
2059 2542 3076 3661 4297 4983 5721 75
100 | 34 136 305 542 847 1220 1661 2170
2746 3390 4102 4882 5729 6644 7627 100
125 | 42 169 381 678 1059 1525 2076 2712
3432 4237 5127 6102 7161 8305 9534 125
150 | 51 203 458 814 1271 1831 2492 3254
4119 5085 6153 7322 8594 9967 11441 150
175 | 59 237 534 949 1483 2136 2907 3797
4805 5932 7178 8543 10026 11628 13348 175
200 | 68 271 610 1085 1695 2441 3322 4339
5492 6780 8204 9763 11458 13289 15255 200
225 | 76 305 686 1220 1907 2746 3737 4882
6178 7627 9229 10984 12890 14950 17162 225
250 | 85 339 763 1356 2119 3051 4153 5424
6865 8475 10255 12204 14323 16611 19069 250
275 | 93 373 839 1492 2331 3356 4568 5966
7551 9322 11280 13424 15755 18272 20976 275
300 | 102 407 915 1627 2542 3661 4983 6509
8238 10170 12306 14645 17187 19933 22882 300
325 | 110 441 992 1763 2754 3966 5399 7051
8924 11017 13331 15865 18620 21594 24789 325
NOTES
Loads based on the formula : D = 0.00339 * Cd * V * V *
S
D = pounds of pressure on boat created by wind
velocity
Cd = the coefficient of
drag
V = wind velocity in
knots
S = square feet of boat exposed to
wind
Temperature = 59F. Barometric pressure = 29.92 in.
Hg.
<><><><><><><><><><><><><><>Mozilla Thunderbird<><><><><><><><><><><><>
Bob McLeran and Judy Young Manatee Cove Marina
M/V Sanderling Patrick Air Force Base
Hampton 35 Trawler Melbourne, Florida
On 4/20/2007 8:48 AM, Robin wrote:
> What's what's a reasonable relationship between anchor holding specs,
> chain working load, and nylon breaking strength? These are the way
> the three are routinely rated in marine catelogues.
<snip>
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