Nick F
Guru
- Joined
- Sep 2, 2020
- Messages
- 688
- Location
- Canada
- Vessel Name
- Callisto
- Vessel Make
- 1974 Grand Banks 42 Classic, Hull 433
I had the following request for some further numbers on required scopes. Two small charts attached which I hope answer the questions. Note that the values I am calculating are not for "straightening out" the chain (which theoretically would take an infinite force), but for reaching the point where the chain is pulling horizontally at the anchor on the seabed.
Quote
I would like to tighten up some of my assumptions regarding scope calculations for lesser used depths. Unfortunately, XL spreadsheets aren't my specialty, or any experience with them. I was hoping I could impose upon you to work some numbers for me.
My anchor chain is 1.5 pounds per foot.
My solid depth scope number is 15' at a 7:1 ratio.
What I would appreciate you doing for me is to calculate the force required to straighten the chain out at 15' ratio 7:1 with 1.5 lbs. chain weight. Then using the force and chain weight, calculate the scope ratios for:
10'
20'
25'
30'
unquote
Quote
I would like to tighten up some of my assumptions regarding scope calculations for lesser used depths. Unfortunately, XL spreadsheets aren't my specialty, or any experience with them. I was hoping I could impose upon you to work some numbers for me.
My anchor chain is 1.5 pounds per foot.
My solid depth scope number is 15' at a 7:1 ratio.
What I would appreciate you doing for me is to calculate the force required to straighten the chain out at 15' ratio 7:1 with 1.5 lbs. chain weight. Then using the force and chain weight, calculate the scope ratios for:
10'
20'
25'
30'
unquote
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