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Old 08-01-2015, 12:27 PM   #41
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I don't lengthen the flucks. Widen them by added mudders as shown in one of your pictures. The throat angle was about 20 degrees, 5 times scope. Now the angle is around 45 degrees, 3 times scope before the shaft would start pulling the flukes up out.

I tested on dry hard land. The flucks started digging in right away where before the anchor would not dig in. Several years ago, we had a long discussion, so I went around the marina counting the number of different anchor, nothing the differences. The new improved anchor had sharp points and edges, and the angle was larger, so the flucks would dig in easier and quicker. Being chaep and old school the modification cost me nothing. Owning an old boat many times you have to think out side of the box, and change modify.
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Old 09-23-2015, 06:26 PM   #42
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I lashed my GoPro camera to a small float. Got some very interesting footage of my anchors in action.

In this video (and 6 others that are viewable from my YouTube channel) I purposely used a very aggressive and violent setting technique. I used lots of boat momentum and made no attempt to "nurse" the anchors into the ground.

The "180 degree, simulated wind shift torture test" was especially interesting as the anchor remained buried throughout its rotation.

Steve

https://youtu.be/d4cHdfsuTfI
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Old 09-23-2015, 08:26 PM   #43
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Good video. The commercial trawler say once they are set, they hold.
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Old 09-23-2015, 08:45 PM   #44
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Wicked awesome idea, floating the gopro above the anchor...which did its job admirably I must say.
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Old 09-24-2015, 07:48 AM   #45
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Interesting camera technique, Steve, thanks for that.


How many horsepower does your engine make at 3000 RPMs?


-Chris
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Old 09-24-2015, 09:07 AM   #46
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Quote:
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Interesting camera technique, Steve, thanks for that.
How many horsepower does your engine make at 3000 RPMs?

-Chris
Ranger, I think I know why you asked that, but I had to laugh, because for some reason it immediately brought to mind a story my late uncle used to tell. He was always full of stories.

This one was about a boy, who when he heard about a neighbourhood being burgled, and her TV stolen, his first question was..."what size screen did it have?"
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Old 09-24-2015, 09:16 AM   #47
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So the snubber is the full length of the chain, or am I looking at this wrong?
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Old 09-24-2015, 09:30 AM   #48
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Interesting camera technique, Steve, thanks for that.


How many horsepower does your engine make at 3000 RPMs?


-Chris
Chris, according to the the yanmar "propeller curve" chart, the engine makes 14 horsepower at 3000 rpm (max crankshaft power is 40hp and max RPM is 3800).

I use a fairly large, fixed pitch, three blade prop that pulls very hard in forward but in reverse, it is probably half as efficient (many sailboats use featherig props that have the same efficiency in both forward and reverse).

This engine propeller combination is not able to pull, in reverse, nearly as hard as a gale force wind with chop would pull. It is why I feel it is important for me to use boat momentum to at least provide a momentary yank on the anchor of very high load.

This does require that one has a lot of confidence in their anchor roller and/or chain snubber.

Boat wieghs about 15,000 lbs.

Steve
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Old 09-24-2015, 09:33 AM   #49
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So the snubber is the full length of the chain, or am I looking at this wrong?
A 30 foot snubber was attached at the 80 foot mark on the chain.

Steve
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Old 09-24-2015, 09:40 AM   #50
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A 30 foot snubber was attached at the 80 foot mark on the chain.



Steve

Ahhh. Gotcha. For some reason I thought it was attached near the anchor.

My snubber is a dinky 10'. Is a 30' snubber used for the extra stretch?
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Old 09-24-2015, 09:41 AM   #51
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So the snubber is the full length of the chain, or am I looking at this wrong?
Take a look again and think about the camera angle...it's straight down...so he must have affixed some sort of float with two lines to the anchor chain or shackle. I'm guessing the float was something flat, so the gopro wouldn't wobble from side to side like a round one would have done..?
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Old 09-24-2015, 09:48 AM   #52
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Cardude, my preference for this test would have been to use no snubber at all (I did just that in the other 6 tests that I videoed). But with this secondary rode, the chain is only 80 feet long, so in order to achieve the desired scope some nylon had to be used.

I suppose I should have used the same rode for each test so as to be a more accurate comparison.

Steve
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Old 09-24-2015, 09:54 AM   #53
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Take a look again and think about the camera angle...it's straight down...so he must have affixed some sort of float with two lines to the anchor chain or shackle. I'm guessing the float was something flat, so the gopro wouldn't wobble from side to side like a round one would have done..?
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Old 09-24-2015, 09:55 AM   #54
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Forfjord

Didn't mean to get the thread sidetracked with snubber talk. I thought the test was cool.

Not familiar with that type of anchor. Looks like it stuck and reset well.
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Old 09-24-2015, 09:56 AM   #55
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Ranger, I think I know why you asked that, but I had to laugh, because for some reason it immediately brought to mind a story my late uncle used to tell. He was always full of stories.

This one was about a boy, who when he heard about a neighbourhood being burgled, and her TV stolen, his first question was..."what size screen did it have?"



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Chris, according to the the yanmar "propeller curve" chart, the engine makes 14 horsepower at 3000 rpm (max crankshaft power is 40hp and max RPM is 3800).

This engine propeller combination is not able to pull, in reverse, nearly as hard as a gale force wind with chop would pull. It is why I feel it is important for me to use boat momentum to at least provide a momentary yank on the anchor of very high load.

Boat wieghs about 15,000 lbs.

Thanks, I suspected it would be useful to better understand how much HP you were applying to the anchor/rode... and to compare your horsepower at 3000 RPMs versus ours. I can't get to 3000, but at 2600 WOT we make 900 hp.

-Chris
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Old 09-24-2015, 10:01 AM   #56
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Here are links to the other 5 videos that I created.

A 33 pound genuine Bruce:
https://youtu.be/VEOMxWidKe0

A 25 pound Danforth copy of exceptionally poor quality:
https://youtu.be/IJJtdlCbUIA

A 45 pound Manson Supreme:
https://youtu.be/tDJwRd-D7vA

A 45 pound Manson Supreme with very short scope:
https://youtu.be/mr37r1j7u0g

A 45 pound Manson Supreme with rode attached to the "rock slot":
https://youtu.be/lVm0NiQ7EB8

Steve
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Old 09-24-2015, 10:02 AM   #57
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There, see...I just knew it was some super high tech camera mount system!
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Old 09-24-2015, 10:08 AM   #58
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Thanks, I suspected it would be useful to better understand how much HP you were applying to the anchor/rode... and to compare your horsepower at 3000 RPMs versus ours. I can't get to 3000, but at 2600 WOT we make 900 hp.

-Chris
In the sailboat world, everyone has roughly the same "relative" sized engine (able to make displacement hull speed). As a result, describing back-down force with rpm is common and somewhat of an apples to apples comparison.

Powerboats naturally have engine sizes that are all over the map. I am glad you brought up the issue in this conversation.

Steve
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Old 09-24-2015, 10:11 AM   #59
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There, see...I just knew it was some super high tech camera mount system!
Murray, it is true that I do not have a lot of money invested in the camera mount as I found the float on a beach.

I did have to go all the way to Barkley Sound to find that particular beach, however.

Steve
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Old 09-24-2015, 11:10 AM   #60
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I think this is very cool. It would benefit a lot of boaters to do the same (assuming the water was clear enough), especially over a long period of time as their boat shifts and acts on the anchor naturally, in addition to what happens as they set it in their normal fashion or try new techniques. It's apparent from a lot of threads here that many people do not understand what is really going on down there.
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