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Old 07-02-2017, 06:59 AM   #1
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The perils of Stabilizers

This beautiful KK 42 apparently got a little out of position in a narrow rocky channel near Lock 42 on the Trent Severn Waterway 2 days ago. I didn't witness it personally but the pics were given to me by a professional boat captain who was driving another boat travelling with them. Apparently, she tore off a stabilizer and sank within 10+ minutes. Fortunately all aboard were able to get to safety. The flow rates are high in the TSW this year and as the river /canal accelerates through narrow rock cuts, or merges with barrage dam outflows, the currents and boat reaction especially for those of us with keels can be dynamic. It's still safely navigable but one hand on the wheel with the other on the throttle(s) & highest level of concentration required in a few but fortunately predictable areas.

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Old 07-02-2017, 07:16 AM   #2
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How sad.
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Old 07-02-2017, 07:21 AM   #3
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Very sad to see.
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Old 07-02-2017, 07:30 AM   #4
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Very sad.
Beautiful vessel.
Glad all are safe.
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Old 07-02-2017, 07:47 AM   #5
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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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Old 07-02-2017, 08:02 AM   #6
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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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Old 07-02-2017, 08:52 AM   #7
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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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Old 07-02-2017, 09:00 AM   #8
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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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Old 07-02-2017, 09:25 AM   #9
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Quote:
Originally Posted by Portage_Bay View Post
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.
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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Old 07-02-2017, 09:43 AM   #10
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Very sad. Dangerous to say the least. What if that had been due to large floatsom in the ocean?? Ten minutes from impact to sink. Hardly enough time to throw out the emergency raft.

Everything You Ever Wanted to Know About Marine Stabilizers

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Naiad Motion Interceptors

Quantum Rotary Stabilizers

Quantum ZeroSpeed Stabilizers

Sealine C48 Seakeeper Stabilizer Installation
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Old 07-02-2017, 10:47 AM   #11
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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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Old 07-02-2017, 10:57 AM   #12
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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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Old 07-02-2017, 11:04 AM   #13
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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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Old 07-02-2017, 11:09 AM   #14
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This tells us more about Kady-Krogen than it does about fin stabilizers........
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Old 07-02-2017, 11:13 AM   #15
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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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Old 07-02-2017, 11:26 AM   #16
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Quote:
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This tells us more about Kady-Krogen than it does about fin stabilizers........
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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Old 07-02-2017, 11:26 AM   #17
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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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Old 07-02-2017, 12:33 PM   #18
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Quote:
Originally Posted by bayview View Post
That raises the question about installing fins on cored hulls. I think KKs have balsa cored hulls...
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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Old 07-02-2017, 12:37 PM   #19
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About 22 years ago (KK owners chime in) KK transitioned from cored to solid FRP below waterline...
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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Old 07-02-2017, 12:51 PM   #20
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Some local news about the sinking and the fuel that's leaking.

Diesel leaking from sinking boat on Trent-Severn | Orillia Packet and Times

Fuel leaks into Trent-Severn Waterway after boat sinks | CTV Barrie News
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