Anchoring, under-keel clearance and passage planning
Anchoring, under-keel clearance and passage time, with the numbers the calculators stop short of. Minimum scope by bottom and length of stay. What the anchor is actually holding — load goes as the square of the wind, so 40 knots pulls four times what 20 does — and the wind at which your chain comes bar-taut and stops being the spring you were relying on: for 8 mm at 6:1 that is about 27 knots. Then under-keel clearance, where the Rule of Twelfths cannot be trusted, and what a passage to windward really takes. 9 pages, printable, with a fill-in passage plan and anchor log.
What’s inside
Minimum scope by bottom and length of stay - chain and mixed rode
What each bottom does, and the two that often will not hold at all
The steady pull on your anchor, by wind speed and windage — and why doubling the wind quadruples it
The wind at which your chain comes bar-taut and stops being a spring, by chain size and scope
Why veering more chain buys more than buying heavier chain
Fill-in sheet for your own boat's windage, chain and scope
Swing-room tables: the water you actually sweep, not the rode length
Anchoring order of work, and a before-you-turn-in checklist
Water needed above charted zero, by swell and the margin you keep
Where the Rule of Twelfths cannot be trusted, and what to use instead
Real passage times by windward fraction and tide
Fill-in passage plan and anchor log
Plus a second PDF, worked out for you
Run one of the free calculators first and buy from that page, and this sheet is computed from your own figures. Buy from here and the pack still arrives complete — the sheet simply has no numbers of yours to work from yet.
14-day refund, no questions asked. If the pack is not what you needed, email support@graburl.com and we refund you in full — you do not have to justify it or delete the file. Full policy.
$19.00 including any taxes · PDF, 9 pages · instant download, link valid 7 days and 5 downloads. Sold by GrabURL. The charge appears on your statement as GrabURL. Refund policy · Terms of sale · support@graburl.com
