SailNet Community - View Single Post - Keel J bolt replacement in lead keel
View Single Post
  #23  
Old 01-16-2013
deniseO30's Avatar
deniseO30 deniseO30 is offline
Move over Joan Rivers!
 
Join Date: Nov 2006
Location: Bristol pa
Posts: 6,145
Thanks: 52
Thanked 89 Times in 79 Posts
Rep Power: 9
deniseO30 will become famous soon enough deniseO30 will become famous soon enough
Re: Keel J bolt replacement in lead keel

Quote:
Originally Posted by Freerider View Post
I found this from a Don Casey article that was linked at the bottom, its a little reassurance.


" Except on radical race boats, keels rarely fall off. The reason is that a huge safety factor is nearly always designed into the attachment system. Nevin’s Rule calls for one square inch of bolt section for every 1,500 pounds of ballast. Both galvanized steel and bronze have tensile strengths of around 60,000 pounds per square inch, so if a builder follows this rule, the bolts attaching a 4,500 pound keel are capable of supporting 180,000 pounds—a margin of safety of 40 to 1. Of course, the static load increases with heel, and we can only guess at the dynamic loads, but in a recreational boat neither is likely to test or even approach such bolt strength."


Keel Bolt Concerns
Sounds good.. but when they go, it's the shoe that lets loose.. Like mid 80s Catalina 30s used plywood in there...

20-40 year old FG that's had water in if most of those years.. is not really all that strong either.
__________________
Denise, Bristol PA, Oday 30. On Tidal Delaware River, Anchor Yacht Club. New Website!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

my current "project"!
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook