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SUMMARY OBSERVATIONS PUGET SOUND TESTS, SITES 1, 3 AND
56
AVERAGE HOLDING POWER
The results are slightly skewed in favor of the anchors tested with
the higher horsepower boats. In a few tests the CQR,
Delta and
Performance 35 were not dragged because of limits on the horsepower of
the boats setting those anchors. Nevertheless, the averages give a
reasonable picture of relative holding power.
Wing Point and Jefferson Head are not included as being
generally foul ground.
COMPARISON WITH OTHER ANCHOR TESTS
A summary of the West Marine San Francisco mud tests of 1990 and the
1990 Biscayne Bay sand tests reflects the following.8
Comparison with Columbia River
tests11
in sand bottom.
Average Observations
|
Anchor |
Cable Tension to Drag |
|
CQR 45 |
437 |
|
Bruce 45 |
305 |
|
Luke 50 |
186 |
Dan Hi Tensile 25 |
849 |
|
Lightweight 25 |
809 |
Three other anchor tests are summarized in Appendix 2. They provide
an interesting comparison. They confirm that the Bruce style
generally does not perform as well as the CQR or Danforth types.
The MAX anchor tests at Pensacola indicate that at least on those tests
which were commissioned by Creative Marine, the MAX
out-performed the FX 37,
CQR 45 and Bruce 44 consistently.
CALCULATED RODE TENSION IN WIND AND
WAVES12
The following is Bob Smith's analysis of the force applied to
sailboats of different sizes in wind and waves based on observations in
the Columbia River. See "Anchors Selection and Use"
2d ed.
(1983).
|
|
|
WIND VELOCITY - KNOTS |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
21 |
24 |
27 |
30 |
33 |
36 |
39 |
42 |
45 |
48 |
51 |
54 |
57 |
60 |
63 |
|
LENGTH OF BOAT IN FEET |
21 |
46 |
60 |
76 |
94 |
114 |
135 |
158 |
184 |
211 |
240 |
271 |
304 |
339 |
375 |
414 |
|
|
24 |
60 |
78 |
100 |
123 |
149 |
176 |
207 |
240 |
275 |
313 |
354 |
397 |
442 |
490 |
540 |
|
|
27 |
76 |
99 |
126 |
155 |
188 |
223 |
262 |
304 |
349 |
397 |
448 |
502 |
560 |
620 |
684 |
|
|
30 |
94 |
112 |
156 |
192 |
232 |
275 |
323 |
375 |
430 |
490 |
553 |
620 |
691 |
765 |
844 |
|
|
33 |
113 |
148 |
188 |
232 |
281 |
333 |
391 |
454 |
521 |
592 |
669 |
750 |
836 |
926 |
1021 |
|
|
36 |
135 |
176 |
224 |
276 |
334 |
397 |
465 |
540 |
619 |
705 |
796 |
893 |
995 |
1002 |
1216 |
|
|
39 |
158 |
207 |
263 |
324 |
392 |
465 |
546 |
634 |
727 |
827 |
934 |
1048 |
1168 |
1293 |
1427 |
|
|
42 |
183 |
240 |
305 |
376 |
455 |
540 |
633 |
736 |
843 |
960 |
1083 |
1215 |
1355 |
1499 |
1655 |
|
|
45 |
211 |
275 |
350 |
431 |
522 |
620 |
727 |
844 |
968 |
1102 |
1243 |
1395 |
1555 |
1721 |
1899 |
|
|
48 |
240 |
313 |
399 |
491 |
594 |
705 |
827 |
961 |
1101 |
1253 |
1415 |
1587 |
1769 |
1958 |
2161 |
|
|
51 |
271 |
354 |
450 |
554 |
671 |
796 |
934 |
1085 |
1243 |
1415 |
1597 |
1792 |
1998 |
2211 |
2440 |
|
|
54 |
303 |
397 |
504 |
621 |
752 |
892 |
1047 |
1216 |
1394 |
1586 |
1790 |
2009 |
2239 |
2479 |
2735 |
|
|
57 |
338 |
442 |
532 |
692 |
838 |
994 |
1166 |
1355 |
1553 |
1767 |
1995 |
2239 |
2495 |
2762 |
3048 |
|
|
60 |
374 |
490 |
623 |
767 |
929 |
1102 |
1292 |
1501 |
1721 |
1958 |
2210 |
2480 |
2765 |
3060 |
3377 |
|
|
63 |
413 |
540 |
687 |
845 |
1024 |
1215 |
1425 |
1655 |
1897 |
2159 |
2437 |
2735 |
3048 |
3374 |
3723 |
|
|
66 |
453 |
592 |
754 |
928 |
1124 |
1333 |
1564 |
1816 |
2082 |
2370 |
2675 |
3001 |
3345 |
3703 |
4086 |
|
|
69 |
495 |
647 |
824 |
1014 |
1228 |
1475 |
1709 |
1985 |
2276 |
2590 |
2923 |
3280 |
3656 |
4047 |
4466 |
|
|
72 |
539 |
705 |
897 |
1104 |
1337 |
1586 |
1861 |
2162 |
2478 |
2820 |
3183 |
3572 |
3981 |
4406 |
4863 |
|
Factor |
0.104 |
0.136 |
0.173 |
0.213 |
0.258 |
0.306 |
0.359 |
0.417 |
0.478 |
0.544 |
0.614 |
0.689 |
0.768 |
0.85 |
0.938 |
13
ANCHOR CABLE TENSION = (LENGTH)2 X FACTOR. SCOPE OF FIVE
BOAT. VEERED 30-DEGREE TO WIND. TABLE VALUES ARE FOR SLOOPS
OR CUTTERS, ADD 15% FOR YAWLS, 25% FOR KETCHES AND SCHOONERS.
NEXT
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