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07-02-2017, 06:59 AM
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#1
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Guru
City: Windmill Harbour, Hilton Head Island, SC
Vessel Name: River Girl
Vessel Model: 2004 DeFever 49 RPH
Join Date: Sep 2016
Posts: 570
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The perils of Stabilizers
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Jeremy
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07-02-2017, 07:16 AM
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#2
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,670
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How sad.
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07-02-2017, 07:21 AM
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#3
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Guru
City: Cape May, NJ
Vessel Name: Irish Lady
Vessel Model: Monk 36
Join Date: Dec 2007
Posts: 4,947
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Very sad to see.
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Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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07-02-2017, 07:30 AM
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#4
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Guru
City: Tampa
Join Date: Oct 2013
Posts: 844
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Very sad.
Beautiful vessel.
Glad all are safe.
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"I'm the only one who has removed half a brain, but if you went to Washington, you'd think someone beat me to it"...Dr. Ben Carson 08-06-2015
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07-02-2017, 07:47 AM
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#5
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Guru
City: Signal Mtn., TN
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,741
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Wow, I hate to see that.
Wonder if this could have been an installation issue? My understanding is that stabs are usually designed to break before the hull does.
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07-02-2017, 08:02 AM
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#6
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,179
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Some years ago there was an article in PMM about a KK that had a similar fate due to a stabilizer grounding and vessel going down in shallow water. This incident was near Yucatan as I recall.
I'm not so sure this indicates the perils of active stabilizers as much as after market install design and hull integrity. It would be interesting to know more details. Regardless, so sad.
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07-02-2017, 08:52 AM
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#7
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Guru
City: Coupeville Wa.
Vessel Name: Pacific Myst
Vessel Model: West Bay 4500
Join Date: Oct 2015
Posts: 2,402
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I've seen the hull damage to a KK42 when she hit the rocks. The stabilizer fin did not break away, it bent up splitting the hull open. I don't know if it is a KK42 structural problem, an after market installation problem or a general design problem with fin stabilizers.
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07-02-2017, 09:00 AM
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#8
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Guru
City: st pete
Vessel Model: 430 Mainship
Join Date: Sep 2016
Posts: 3,483
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I don't understand how these stabilizers aren't attached to protect the integrity of the hull. Sounds like a high risk problem at times.
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Seevee
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07-02-2017, 09:25 AM
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#9
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Guru
City: Signal Mtn., TN
Vessel Name: Stella Maris
Vessel Model: Defever 44
Join Date: Feb 2012
Posts: 2,741
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Quote:
Originally Posted by Portage_Bay
I've seen the hull damage to a KK42 when she hit the rocks. The stabilizer fin did not break away, it bent up splitting the hull open. I don't know if it is a KK42 structural problem, an after market installation problem or a general design problem with fin stabilizers.
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Not saying this was a factor--there's still too many unknowns. Our Naiads have a detente in the shaft to supposedly allow the stab to break away, assuming the supporting blocks on the hull are strong enough. Hope never to put that to the test.
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07-02-2017, 09:43 AM
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#10
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Guru
City: SF Bay Area
Vessel Model: Tollycraft 34' Tri Cabin
Join Date: Feb 2011
Posts: 12,569
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07-02-2017, 10:47 AM
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#11
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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That raises the question about installing fins on cored hulls. I think KKs have balsa cored hulls so if sufficient reinforcement were not installed the hull might fail when the fin strikes a rock.
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07-02-2017, 10:57 AM
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#12
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Guru
City: Vermont
Join Date: Jan 2013
Posts: 10,076
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There are so many factors at play. It would be really educational to learn exactly what failed and how.
But before we get too far down the path of "stabilizers are bad", consider thruhulls for toilets, air conditioners, water makers, etc. They fail all the time for a wide range of reasons, and sink boats. Some aren't installed correctly, or degrade over time, or are of the wrong material, or have bad clamps, or have bad hoses..... Yes we still keep them all so we can enjoy those conveniences.
Everything on a boat is managed risk. There will always be failures, and just because there are isn't a reason not to take on a calculated and managed risk.
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MVTanglewood.com
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07-02-2017, 11:04 AM
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#13
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
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I think the key may be cored hulls and who installs the stabilizers.
Tio many times I have heard of Small yards taking on projects they really didn't research enough.
Cant say for certain in this case. But sure sounds like an engineering flaw in support.
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07-02-2017, 11:09 AM
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#14
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Guru
City: Jacksonville
Vessel Name: Alzero
Vessel Model: Hatteras 63' CPMY
Join Date: Apr 2017
Posts: 1,548
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This tells us more about Kady-Krogen than it does about fin stabilizers........
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07-02-2017, 11:13 AM
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#15
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Guru
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
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No it doesnt.
An issue resulting from an after market item without the results of a thorough investigation means nothing.
A KK 42 is much of tbe way through a circumnavigation, not a testament to its full capabilities or liabilities 100 percent, but so far so good.
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07-02-2017, 11:26 AM
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#16
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Guru
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,179
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Quote:
Originally Posted by Woodland Hills
This tells us more about Kady-Krogen than it does about fin stabilizers........
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About 22 years ago (KK owners chime in) KK transitioned from cored to solid FRP below waterline. But as has been previously noted, details and facts regarding this incident would prove interesting.
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07-02-2017, 11:26 AM
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#17
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Guru
City: gulf coast
Join Date: Jun 2014
Posts: 3,440
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I agree with PS. IMO if it was fin caused hull failure then it is probably an installation issue.
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07-02-2017, 12:33 PM
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#18
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,670
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Quote:
Originally Posted by bayview
That raises the question about installing fins on cored hulls. I think KKs have balsa cored hulls...
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As far as I know, the KK42 till late in the production years, pvc was used as the core material before they did away with any coring below the water line. All of Krogens maketing literature confirms that.
Also, active stabilizers were not a factory option on the KK42s so the quality of the installation could vary.
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07-02-2017, 12:37 PM
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#19
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,670
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Quote:
Originally Posted by sunchaser
About 22 years ago (KK owners chime in) KK transitioned from cored to solid FRP below waterline...
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The KK42 went to solid FRP below the water line in 1992 or 1993. Hobo was completed in 1987 and is hull number 120.
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07-02-2017, 12:51 PM
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#20
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TF Site Team
City: Jacksonville
Join Date: Nov 2008
Posts: 11,670
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