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Old 03-17-2019, 10:08 AM   #61
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Yes I can produce about 1000lb pull at full throttle in fwd gear w Willy .. I think. Just judging from what I have read. Steve of Anchor Setting Vidios got into that when Peter B asked about reverse thrust.

I’ve found that my two propellers differ greatly fwd to reverse. My reverse gear feels like twice or more reverse thrust is availible w my MP prop that has symetrical blades w no twist. That is the pitch is constant across the blades.
But it’s my other prop that’s weak in reverse and it’s probably a typical prop. Like most other trawlers on this forum.

I agree w your “50 or 60hp .... except that I feel it’s closer to 50hp. Nice round figure to work with.

But what happends when you’ve got a group of boaters w extremly wide range of boats .. some w enough power to pull a house over and others w barely enough to pull the screen door open. All talk’in about backing down anchoring at 1400rpm.

We all need to sort this all out and do what’s relavant to our own boats and situations.

And FF other anchor tests use a benchmark of 5000lbs rode tension.
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Old 04-12-2019, 07:49 PM   #62
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Anchors are like cars, everyone has an opinion as to what's the best but as with cars there's less difference than meets the eye. I've been anchoring for 40 years on a 40' boat. On our old wooden cruiser we ran a 45# Danforth type and claw (Bruce) day hook. In the case of anchors size does matter. The 33# Bruce is OK but at the lower end of the scale. We always held well but ran a sentinal (weight system that reduces the boat jerking on the anchor).

Our current 40' Tolly runs a 44# Bruce with chain rode, if I were buying another I'd go up a notch size.
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Old 04-12-2019, 08:38 PM   #63
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Slowmo,
Is your user name related to the old hydroplane “Slow-motion IV”?
I remember those days. In those days “marine engines” had the flywheel on the proper and ideal end on the engine.

I agree that when using a Claw one should use an anchor one or two sizes larger than what one would carry using a modern anchor.
I’ve had a theory that one element of the Claw that is common to the Bruce Claw is a relatively shallow (low numerical number) throat angle in degrees. There are other Claws that have a low throat angles and I wonder if anyone else has an opinion re throat angles separating good performers from poor performers. So I ask you do you have any experience or general knowledge relating to this?
I only have/had two Claws that I’ve used. Two have a low throat angles and I have felt they had better performance that I expected hearing all the negative verboso on the Claw type of anchor. I also had another Claw on my previous boat that worked OK. Don’t remember ever anchoring in much wind w that one though. Went to Juneau and back using it all the time though.
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Old 04-12-2019, 09:50 PM   #64
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Hi, No I didn't intend to reference Slow Motion though with our wood boat I had Jensen motorboat do our maintenance over the past decade. But the reference really was to the 7.5kn cruise speed of our old Respite.

I actually have much more experience with a Danforth type. The Tollycraft we purchased has a Bruce and and the former owner swore by it. I used a Bruce as a 'day hook' on Respite but never overnight. Respite has a fairly large Danforth type that was fabricated (years ago) by my father and modified to a) allow slightly more fluke angle to improve digging in and b) modfied pivot to prevent the rode from being able to snag the pivot. Its also about 50#. That worked extremely well over the past 30 years or so, but when I look at how big an anchor we had versus other 40' boats (with more windage)...well I tend to think a lot of boats are under endowed on the anchor front.

On the Bruce I would expect the throat angle to play a role, just as the fluke range of a Danforth can. But I imagine it is a trade off between how quickly it can grab and ultimate holding power. However my personal experience with the Bruce is limited to a day hook or stern anchor on Respite. Our just purchased 40' Tollycraft has the 44# Bruce. I haven't had it out yet so but the the boat has been to Alaska and didn't end up on a beach. I do think a lot of people who complain about this or that anchor are blaming the equipment rather than the operator. It may be that the new anchors (Rocna) are a bit more forgiving of the operator.
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Old 04-13-2019, 01:35 AM   #65
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Slowmo,
Interesting bout the Dans.
I bought a very heavily built Danforth from Dunlap Industrial Supply in Everett. Was 35lbs as I recall and on my 30’ Willard that nearly a monster. This no name Dan had beefy low aspect ratio flukes and a 3/4” thick shank. Very beefy thing. Never did get it wet and don't remember what happened to it. Seems to me it had a wider throat angle probably aiming for short scope work. It was said the anchor was made by a salvage company in their own shop.

Have you seen the thread “Anchor Setting Videos”? I think I saw a Claw break out vertically. As in the fluke end of the anchor popping straight up. That was the strangest thing I ever saw an anchor do. Gonna go back and make sure I wasn’t seeing things. That’s what made me think about the throat angle. If the throat angle was wide it would force the fluke to be in an inverted way at a very high angle of attack. Under high rode tension the shank tip would be pressing down on the seafloor and then if the fluke abruptly “stalled” it could break out vertically. That’s the only explanation I can produce.

I found the Bruce test where the anchor broke out vertically ... post #118.
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