If the enlarged chainplates are not approved, this may be where we part ways. Refer to an earlier thread:
https://j30.us/ubbthreads/ubbthread...30_bulkhead_technical_dis.html#Post11207The orignal chainplates are of poor grade 3006 stainless. This has a very high ferrus content. Replacement with grade 3016 is the MINIMUM upgrade that should be performed. In addition, the load needs to be spread out over a much larger area of the bulkhead. This was pointed out to me when we reviewed the design with a licensed marine surveyor. As a result, both of my upgraded plates extend downwards until it meets the curve of the hull. This design is typically found in custom offshore sailboats. If it is a choice between a safe boat vs. a boat that meets the one design rules, guess which wins? I respect Rod's ability to design a fast boat, however, the chainplates that were selected for BOTH the J-24 and the J-30 have nearly resulted in disaster on MY boats due to stress cracking. For those of you who tension the rig to 1800 lbs, especially take note!!
