Advice on setting my anchor

[msu1966]

I am setting my anchor on my R27 for the first time with the standard anchor from the factory. I keep drfting in 12' of sand bottom with approximately 25' + of Cain deployed. After deploying the chain I put her n reverse @ 600 rpm. to set it in sand bottom but I still drift with 7 mph wind.
Any suggestions are appreciated.
Thanks, Ken

 

[gswearin]

Hi Ken,
I'd increase your scope to at least 5:1. in 12 feet with about 3 feet from the roller to the water, I'd put out 75 feet of rode.

 

[msu1966]

Gary are you saying I should deploy all of the chain plus 75' of rode? How much torque/rpm in reverse to get the anchor to hold?

 

[CaspersCruiser]

Calculus: Water depth + distance from bow sprit to water (I use 5’ on my 2012 R27) multiplied by desired scope— 3 for benign conditions, 5 minimum for stronger winds or current, 7 or more for storms)

So if you are in 12’ of water in an R27 Classic, for a 3 to 1 scope, you should deploy 51’ of anchor rode. For 5 to 1 it’s 85’. For 7 to 1 it’s 119’.

https://www.soundingsonline.com/voices/ ... -anchoring

 

[msu1966]

Casper Cruiser, your advice and the link you gave I believe has worked so far. I was doing the math like this: @ 3 :1 I multiplied the depth of 12 ft. x 3 = 36 + 6 for height off the water = 42 ft. of rode. Not sure how the 3:1 gets you to 51 ft. The other part I did not do was putting the boat in reverse while paying out the rode after the anchor was on the bottom.
Huge appreciation to all.
Regards, Ken

 

[dbsea]

Casper Cruiser, your advice and the link you gave I believe has worked so far. I was doing the math like this: @ 3 :1 I multiplied the depth of 12 ft. x 3 = 36 + 6 for height off the water = 42 ft. of rode. Not sure how the 3:1 gets you to 51 ft. The other part I did not do was putting the boat in reverse while paying out the rode after the anchor was on the bottom.
Huge appreciation to all.
Regards, Ken

It's (12 + 6) *3 = 54 or 18 *3 = 54, 51 if using the 5ft off the water calculation.

 

[CaspersCruiser]

……I was doing the math like this: @ 3 :1 I multiplied the depth of 12 ft. x 3 = 36 + 6 for height off the water = 42 ft. of rode…..

This afternoon, I measured the distance from the bow anchor roller to the water on my 2012 R27 to confirm a measurement I made a few years ago. It is 4’ 6” bow to water. I round that up to five for easy anchor math.

The formula for how much anchor rode to deploy is: Water depth + Bow to Water distance multiplied by the desired scope. For example, to anchor in 12’ water depth in my boat at a 3 to 1 scope, the formula is (12’ + 5’) x 3 = 51’.

 

[Brian98133]

Plus draft, I would assume? Since our transducer is on the keel, whatever your draft is should be included. I.E., 4.5' roller to waterline plus 2' draft = 6.5'.

That's what I do, anyway. Not sure if I"m splitting hairs - which I can scarcely do these days! 😀

 

[dbsea]

Plus draft, I would assume? Since our transducer is on the keel, whatever your draft is should be included. I.E., 4.5' roller to waterline plus 2' draft = 6.5'.

That's what I do, anyway. Not sure if I"m splitting hairs - which I can scarcely do these days! 😀

If you have a recent garmin, the draft offset is programmable in the chart plotter and will be reflected in your depth number on the chart plotter.

 

[Brian98133]

True, true! I have the offset at zero because I have a couple 'scary' areas to get through and I want to know exactly what my clearance is.

 

[CaspersCruiser]

…… I want to know exactly what my clearance is.

If that is your desire, then most folks would suggest using an offset. That way your depth sounder will read how much water is below your running gear.

 

[trailertrawlerkismet]

After you get your desire scope let out you would then, in idle plus a tad, back down until you feel the anchor has set. After it is set make sure to tie the rope rode or chain off a bow cleat. A tied off line prevents your ride from deploying if your windless fails to hold in place. If you plan on anchoring a lot and in various sea bottom conditions you might think about upgrading the anchor to a Rocna or equivalent style anchor, for better and more secure holding power.

Jim F