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My J/24 is sitting on the trailer, the weather is decently warm, and I have a few weeks off of school for the holidays. I am looking to fair the keel. How do I make a set of templates? I know that the minimum dimensions are in the Class Rules, but I don't know what to do with them. What should I make the templates from? Should I make them in halves? How do I measure to see if the keel is centered in the boat? Does anyone have a photo of their templates? I'm not trying to take anybody's design, I just want to see what I am about to try to make. Any info anyone has would be great.
mountsbay posted a topic in Sailing AnarchyIn April 2014 Cheeky Rafiki a First 40.7 (Farr Yacht Design #354 - http://www.farrdesign.com/354.html) lost its keel during an Atlantic crossing. All crew members perished. In April 2015 the UK’s MAIB issued a report of the investigation of the loss. The report speculated about the (root) cause of the loss but no conclusion was reached. A thread on this site also speculated about the root cause but did not reach a consensus. One conjecture was that the hull liner (inside the hull and providing structural support) was not properly bonded to the hull. There seemed to be little dissent from the view that lack of such bonding might eventuate in a number of ways (including perhaps such an unremarkable event as ‘light’ grounding of the vessel) and that subsequently routine events during use of the vessel could cause loss of the keel. The First 40.7 and yachts of many other types employ a construction of this general type so the risk associated with this failure mode may be of interest to many people – as may be methods of inspection and if necessary repair of the relevant structure. With regards to inspection and repair the MAIB report recommended that best practice guidance should be developed. The thread on this site considered but did not reach consensus on what this best practice might be. Early in the thread someone identifying as 'Patrick Shaughnessy' posted the message below. The post suggests that this may be the same person as the Patrick Shaughnessy who is president of Farr Yacht Design. The post suggests that 'Patrick Shaughnessy' considers that (as might be expected) Farr Yacht Design could provide useful information on both the inspection and repair of the structure under discussion. The post indicates that 'Patrick Shaughnessy' intended to comment further on the MAIB report 'We take safety very seriously and will issue an announcement/addendum to the MAIB report'. Does anyone know if such an 'announcement/addendum' has been issued? If so where can it be found? Patrick Shaughnessy Newbie Members 0 4 posts Report post #10 Posted April 29, 2015 I just wanted to say to the group here, that we assisted in the MAIB investigation, but were unable to review a draft of the document before it was published. I think there a few inconsistencies in the report, but on the whole it is a well written document. The report does indicate that prior groundings were repaired in an unknown way. Just to be 100% clear, at FYD we have no knowledge of the Beneteau dealer recommended repair procedure. That by itself is a pretty worrying. Even if that was followed, we don't necessarily know that it would be sufficient. We take safety very seriously and will issue an announcement/addendum to the MAIB report with some other considerations. The biggest thing I want to emphasize is, please contact your yacht designer if you have any questions. If you have an incident that potentially caused structural damage, contact your yacht designer. If you have an impending repair contact your yacht designer. In this particular instance the hull liner laminate (do not call it a matrix), is not a trivial simple laminate. Replacing it with some unknown laminate to similar thickness would not necessarily be adequate. Please ask first. It almost incomprehensible that a repair could be made in a critical area like this without guidance. Please let us help you. We will be back with more, after we've had a chance to fully digest the report. Stand by. Patrick
First time poster, long time browser. I recently purchased a Santana 20 that needs a little TLC. (Looking to PHRF race on Lake Norman in NC) I discovered that the keel bolts and nuts (3/4") are quite corroded and in anyone's book...suspicious at best. So, Instead of disturbing the nuts that are possibly contributing a small amount to the strength of the keel/hull joint, I am contemplating a strategy to strengthen with additional bolts. Here it goes. There 5 keel bolts from Schock. 2 front, 2 rear, and 1 astern. My plan is to add two additional 3/4" threaded rods between the existing sets of bolts down the centerline of the boat. Drill each hole at least 12" into the lead of the keel. Get as much of the debris out as possible. Partially fill the holes with epoxy (Proset M1033 resin and M2036 hardener), and drop threaded stainless rod in until the hole is completely filled with epoxy. This should leave me with ~1" of exposed threads. Let this set for a few days, then tighten up the connection with stainless washers and nuts. My only real concern is how well the epoxy will bond to the lead. I am told the good people at West Systems that there should be an excellent bond between the lead hole and the stainless all thread. Does anyone have an experience with this or a similar approach for repair? Thanks, Morgan