dhays
Guru
- Joined
- May 26, 2015
- Messages
- 9,046
- Location
- United States
- Vessel Name
- Kinship
- Vessel Make
- North Pacific 43
I come from sailboats with relatively small engines. My last sailboat had a 56hp engine on a 40' boat. When I set my anchor I would give it about 80% throttle in reverse. Worked fine.
Now I have a 43', 31,000lbs boat with a 380hp engine. I don't think giving it that much power to set the anchor is a great idea.
I recall hearing a rule of thumb (for what those are worth) to use about 1hp per foot of boat to set an anchor. That is about what I had been doing on my past sailboats.
Assuming that isn't a silly concept, my Cummins will idle at about 600rpm. At 800 rpm, according to Cummins, it produces 58 hp. So, how much power should I be applying to set the anchor? The last time I anchored this new boat I pulled the anchor out twice after bringing the rpm up to my normal cruise power. I didn't think about it until today that this is about 140hp, 3x what I could ever have generated with my sailboat.
Second question. What scope should the anchor be set at? I'm not talking about what scope should be out for the anchor to hold, so lets not get sidetracked. I'm asking what scope should I use to set the anchor with an all chain rode? I used to set at about 5-1 on my sailboat and then adjust from there but that was simply an uninformed practice that seemed to work most of the time.
Now I have a 43', 31,000lbs boat with a 380hp engine. I don't think giving it that much power to set the anchor is a great idea.
I recall hearing a rule of thumb (for what those are worth) to use about 1hp per foot of boat to set an anchor. That is about what I had been doing on my past sailboats.
Assuming that isn't a silly concept, my Cummins will idle at about 600rpm. At 800 rpm, according to Cummins, it produces 58 hp. So, how much power should I be applying to set the anchor? The last time I anchored this new boat I pulled the anchor out twice after bringing the rpm up to my normal cruise power. I didn't think about it until today that this is about 140hp, 3x what I could ever have generated with my sailboat.
Second question. What scope should the anchor be set at? I'm not talking about what scope should be out for the anchor to hold, so lets not get sidetracked. I'm asking what scope should I use to set the anchor with an all chain rode? I used to set at about 5-1 on my sailboat and then adjust from there but that was simply an uninformed practice that seemed to work most of the time.
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