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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 swing keel failure		  New Topic  Topic Locked
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dasreboot
Admiral

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804 Posts
Initially Posted - 08/10/2016 :  08:46:36  Show Profile  Visit dasreboot's Homepage
the sail school where I teach has a plague of keel cable failures on C22s mostly due to renters over tightening the keel winch. I was doing some research into marking the cable with paint so the people know when to stop. Has anyone tried this? How long did the paint last? I was also thinking about laminating instructions so they will know not to turn the winch the wrong way.

While looking at this, I saw a few people, including stingy sailor, claim that keel cable hum is partially to blame for cable failures due to metal fatigue due to vibration. So to hum or not to hum? thoughts?
Todd Lewis
Eowyn 87 TR/WK C25 #5656
ARWEN 84 TR/SK C25 #4031
www.mainsailsailingschool.com

Dave5041
Former Mainsheet Editor

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USA
3758 Posts
Response Posted - 08/10/2016 :  18:36:57  Show Profile
flopping around is probably more damaging than low amplitude vibration.

Dave B. aboard Pearl
1982 TR/SK/Trad. #3399
Lake Erie/Florida Panhandle
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sethp001
Mainsheet C-25 Tech Editor

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814 Posts
Response Posted - 08/10/2016 :  18:46:58  Show Profile
quote:
Originally posted by dasreboot

the sail school where I teach has a plague of keel cable failures on C22s mostly due to renters over tightening the keel winch. I was doing some research into marking the cable with paint so the people know when to stop. Has anyone tried this? How long did the paint last? I was also thinking about laminating instructions so they will know not to turn the winch the wrong way.

While looking at this, I saw a few people, including stingy sailor, claim that keel cable hum is partially to blame for cable failures due to metal fatigue due to vibration. So to hum or not to hum? thoughts?


I agree with Dave's comment, although since I dislike the hum I let my cable flop. In addition, I doubt over tightening the cable on the winch would cause failure due to the sufficient loading specification of the hardware. I think that the screws holding the winch in place can handle less force than the keel lifting cable and its attachment hardware. Could lack of maintenance, or previously replaced parts not to spec, be to blame?


Seth
"Outlier" 1987 Catalina 25 SR/SK/Traditional Interior #5541
"Zoo" 1977 Morgan Out Island 30
"Nomad" 1980 Prindle 16
"Lost" 1988 Catalina Capri 14.2 (sold - yay!)
"Marine Tex 1" Unknown Origin POS 8' Fiberglass Dinghy
https://whichsailboat.com/2014/07/27/catalina-25-review/
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dmpilc
Master Marine Consultant

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USA
4593 Posts
Response Posted - 08/13/2016 :  15:39:28  Show Profile
Every person taking out your C22's needs to be educated about the keel cable. More likely than overtightening is letting it go too loose and developing cable overlaps, which can definitely damage the cable.
DavidP
1975 C-22 SK #5459 "Shadowfax" Fleet 52
PO of 1984 C-25 SK/TR #4142 "Recess"
Percy Priest Yacht Club, Hamilton Creek Marina, Nashville, TN
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jerlim
Master Marine Consultant

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USA
1484 Posts
Response Posted - 08/16/2016 :  07:00:02  Show Profile
Is there any information on where the failures occur? Also, how old are the cables? Those lift cables are rated for thousands of pounds above the load of the keel, and any additional tension likely imparted by the winch. Do the failures occur at the swagged fitting?
Jerry
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.