| View previous topic :: View next topic |
| Author |
Message |
jep27
Joined: 28 May 2020
Posts: 25
City/Region: New Haven
State or Province: VT
C-Dory Year: 2007
C-Dory Model: 26 Venture
Vessel Name: Lunasa
Photos: Lunasa
|
 Posted: Fri Mar 29, 2024 2:59 pm Post subject: Windlass replacement bolts? |
 |
|
Last fall, while replacing a friends sailboat buy in 4-5 foot waves, our anchor mount got caught and ripped off. All four bolts sheared flush with the deck.
My question is: are these bolts designed to shear under a certain amount of torque? Or.. just standard stainless bolts?
I’m certainly glad that the bolts did snap… before more damage was done to the fiberglass hull/bow.
Thanks for any inputs…
_________________
jep27 |
|
| Back to top |
|
 |
thataway
Joined: 02 Nov 2003
Posts: 20814
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
|
| Posted: Fri Mar 29, 2024 5:39 pm Post subject: |
|
|
| Quote: | Last fall, while replacing a friends sailboat buy in 4-5 foot waves, our anchor mount got caught and ripped off. All four bolts sheared flush with the deck.
|
I believe I need an interrupter here. What caused the 4 bolts on the Windlass to shear? Were you being towed by a sailboat in 4 to 5 foot seas? If so the entire vessel should have been bridled. Never trust deck hardware when using a tow line, except if the tow bit is designed for the load of several thousands of pull.
The SS bolts for the windlass I believe are metric and metric thread. They are not designed to take much more Thant 1000 lbs load--and one should never ride with the anchor chain or rode fixed to the windless instead of a proper bridle for the anchor (different than bridling the boat.
However they are not designed to shear at a certain load pressure. Was there any crevice crack corrosion around the base of the windlass on these bolts? I would expect that if the bolts failed.
_________________
Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
|
| Back to top |
|
|
ssobol
Joined: 27 Oct 2012
Posts: 3374
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
|
| Posted: Fri Mar 29, 2024 8:12 pm Post subject: |
|
|
| Stainless is not all that strong. You should use grade 5 or 8 bolts. Grade 8 is stronger, but also more brittle. |
|
| Back to top |
|
|
jkidd
Joined: 23 Oct 2006
Posts: 1616
City/Region: Northern, Utah
State or Province: UT
C-Dory Year: 2007
C-Dory Model: 22 Cruiser
Vessel Name: Voyager
Photos: Voyager (JK)
|
| Posted: Fri Mar 29, 2024 11:06 pm Post subject: |
|
|
Just call the vendor and have them send you 4 more bolts. Or ask them the specifications so you can get them locally. Using grade 5 or 8 would be steel bolts and that would be dissimilar metals and they will rust and corrode. You don't need to make them any stronger than what the factory supplied. Just don't repeat what you did to shear them off.
_________________
Jody Kidd
KE7WNG
Northern, Utah
 |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
|
|
Search
Private Messages
Profile
Log in
Register
Help
