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Old 02-21-2016, 10:32 AM   #261
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Art,

Thus far, all my tests of the Fortress have been conducted with the fluke angle in the 33 position. I will put a test using the 45 position on my wish list.

Steve
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Old 02-21-2016, 11:29 AM   #262
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In my experience...the Danforth/fortress style lands flat no matter what the fluke angle is set at. If it doesn't catch and dig...nothing changes...it is only when it grabs that the larger fluke angle just grabs more bottom.


But they all land and flatten to near zero fluke angle...no catchie....no grabbie....and no to being the primary anchor on my pulpit for that reason.
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Old 02-21-2016, 12:56 PM   #263
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On harder bottoms I seem to recall a Fortress in one of Steve's vids that just jacked the whole anchor up in the air (water) and fell over on a stock. Art , I suspect your bottom is extremely soft. Steve's bottoms are much firmer and I doubt very seriously if the aluminum Fortress would set w the flukes set at 45 degrees up here.

In Alaska w murkey water and not much sunlight bottom seaweed is much less. Lots of Bull Kelp but we don't anchor in Bull Kelp. The only time my old Danforth wouldn't hook up is in about 6' of water at a river mouth on grass in northern BC. It was like trying to set anchor on an oiled plate. Was some kind of thick light green grass. The weed that you see in Steve's vids is real common here in Puget Sound. Usually dosn't interfere w anchoring but upon retrieval great salads of green seaweed regularly comes up.
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Old 02-21-2016, 01:37 PM   #264
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Steve's bottoms are much firmer and I doubt very seriously if the aluminum Fortress would set w the flukes set at 45 degrees up here.
I'll just add that Brian, from Fortress anchors is watching all these videos and making comments (on other forums). He as made no suggestion that I try the 45 degree fluke setting.

Steve
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Old 02-22-2016, 11:49 AM   #265
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Steve,

The 45 shank / fluke angle should only be used to improve holding capacity in a soft, silty, soupy type of mud bottom. If this angle is used in a harder soil, which appears to be the bottom condition for your videos, then the anchor is likely to skip along and not set.

Here's an image from the Vryhof anchoring manual which has an explanation and illustrations which can help clarify what can occur:


post image


Vryhof also manufactures anchor models with a wider shank / fluke angle to improve holding in soft mud (as does Bruce and the US Navy), so this performance feature is no secret to Fortress, although we hold a US patent on the adjustable 32 / 45 crown (centerpiece).

Safe anchoring,
Brian
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Old 02-22-2016, 11:56 AM   #266
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Steve,

The 45 shank / fluke angle should only be used to improve holding capacity in a soft, silty, soupy type of mud bottom. If this angle is used in a harder soil, which appears to be the bottom condition for your videos, then the anchor is likely to skip along the bottom and not set.

Here's an image from the Vryhof anchoring manual which has an explanation and illustrations which can help clarify what can occur:


post image

Vryhof also manufactures anchor models with a wider shank / fluke angle to improve holding in soft mud (as does Bruce and the US Navy), so this performance feature is no secret to Fortress, although we hold a US patent on the adjustable 32 / 45 crown (centerpiece).

Safe anchoring,
Brian
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Old 02-22-2016, 03:47 PM   #267
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Pleased to see you in Brian. Thanks for info. Do you know... are the results mentioned by Vryhof backed by accurate data resulting from closely watched/measured seabed anchor penetrations?
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Old 02-22-2016, 04:11 PM   #268
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Pleased to see you in Brian. Thanks for info. Do you know... are the results mentioned by Vryhof backed by accurate data resulting from closely watched/measured seabed anchor penetrations?
Art,

Unquestionably. Vryhof has two test tanks in Holland (one soft, the other hard soil) and per my USA contact who is based out of Houston, they have a significant amount of underwater footage which illustrates anchor behavior in various soil conditions.

Here's a link to their new 172 page anchor manual which I think will be of great interest to the esteemed anchor gurus on this forum:

http://www.vryhof.com/flipbooks/am2015/#

Be safe,
Brian
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Old 02-22-2016, 06:40 PM   #269
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Art , I suspect your bottom is extremely soft. Steve's bottoms are much firmer . . .
Get a room, you guys.
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Old 02-22-2016, 08:03 PM   #270
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Get a room, you guys.
That's NOT Funny!!
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Old 02-22-2016, 08:16 PM   #271
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Art,

Unquestionably. Vryhof has two test tanks in Holland (one soft, the other hard soil) and per my USA contact who is based out of Houston, they have a significant amount of underwater footage which illustrates anchor behavior in various soil conditions.

Here's a link to their new 172 page anchor manual which I think will be of great interest to the esteemed anchor gurus on this forum:

http://www.vryhof.com/flipbooks/am2015/#

Be safe,
Brian
Brian - I'm impressed with the anchor manual! Thanks - Art
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Old 02-23-2016, 10:02 PM   #272
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Here is the Fortress FX-16 undergoing the "Reducing Scope" test.

Steve

Video #51
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Old 02-23-2016, 10:34 PM   #273
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I do like FX's - i.e. video # 51.
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Old 02-23-2016, 11:15 PM   #274
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That's NOT Funny!!
Is too!
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Old 02-23-2016, 11:41 PM   #275
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Well so much for "size matters" ...... and you got a salad for desert.
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Old 02-23-2016, 11:52 PM   #276
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The big Forfjord (65 pounds) with the "Deep Set" test. Except for the last moment of the test, it appeared that the anchor was going to stay put - and it probably would have had the anchor not rolled over.

Note: The pull of the anchor rode remained almost perfectly aligned with the initial setting of the anchor.

Steve

Video #52
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Old 02-24-2016, 01:02 AM   #277
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Yikes...that was violent!

It'll be hard not remember that scene next time we are anchored in a big blow
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Old 02-24-2016, 10:24 AM   #278
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I've always thought that w the Forfjord both flukes being spread apart and a bit distant from eachother that the flukes would get in a contest w eachother. And it would be unlikely both flukes would have exactly the same resistance so the better holding fluke would stay burried and the other would break out. That would leave the Forfjord in a position like a set Kedge anchor w little holding power.

The anchor did set beautifly in the vidio. My Forfjord would'nt set the one time I used it nor would another anchor at the same site. But my 13lb Danforth set quickly and held through the night. I didn't keep the Forfjord. The fishing fleet in SE Alaska seems really happy using this anchor ... or the Claw when they can't find a Forfjord used or can't afford one new. They only prefer one other anchor .. the Dreadnought. It looks a lot like the Forfjord and probably sets better but most likely dosn't hold as well. The one time I used the Dreadnought it set instantly .. literaly. As far as I could tell it set itself.
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Old 02-25-2016, 05:48 PM   #279
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Next is the Manson Supreme undergoing the "Deep Set" test.

Unfortunately, great clouds of turbidity obscured much of the action.

Steve

Video #53
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Old 02-25-2016, 07:34 PM   #280
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Next is the Manson Supreme at the "Sand/gravel" site with 2.5 to 1 scope.

Unlike the "sandy mud" site (which is very consistent), this area is quite varied in composition. I noticed that during the SUPER Sarca test (Video #48) the size of the larger rocks was much larger than other nearby areas. See lower right of this photo:


The seabed in the area of this Manson Supreme test is free of larger rocks and seems to have the lowest ratio of rock/sand of all of the tests at this site. This test was conducted within 200 feet of the above Sarca test site.

Steve

Video #54
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