I dunno what you mean, Jeff, by "designed in excess of standards." What I see (quite clearly) is a keel bolted to a fairly thin,flat area of fiberglass with no sump nor much reinforcement, and woefully small backing plates that do not look to be up to the task of distributing the load very well. In fact, it is no suprise to me that the fiberglass ripped away right at the edges of the backing plates. This simply looks like weak engineering and most boats I have inspected seem better engineered than this. The pictures tell the story.
Its not what I mean, since its not my conclusion that this boat was designed in excess of the current standards. It was the conclusion of a post construction analysis by the Wolfson Unit. In post #9 I posted links to Annex C&D which was the analysis done by the Wolfson Unit on the structural system on the 40.7's. Annex C & D speak for themselves. But that is what I was quoting when I made that statement. (You might take a look at that since its very well written and discusses many of the points in more detail than I am summarizing here.)
The one area that the report said was deficient under current standards was the keel bolts on that particular 40.7 built. The aft most centerline keel bolt was omitted on the boat in the report. (That is the bolt which failed on the subject boat of this thread as seen in the pictures of the top of the keel). Without that bolt, the bolts only achieved 95% of the current standard but still met the prior standard. This boat obviously had that last bolt present. But this was clearly not a case of a keel bolt failure (except that arguably may have been a bolt failure in the case of the aft most centerline bolt)>
In any event, whatever you think you see, the report in that link analyzed both the original engineering and construction of a 40.7 as it was actually built and concluded that the internal structure of the keel was 7.96 stronger than required under the current standards. And while those backing plates may seem small to you, they are larger than required by the standard and certainly larger than those that I have observed in many popular production boats, as well as on some higher end limited production boats. (i.e. Swan or on a similar sized Hallberg-Rassey)
To be clear, I am not saying that the structure was adequate for the loads that this boat encountered. Assuming that this keel was not in some way compromised by some other set of circumstands, obviously it wasn't.
But what I am saying is that what makes this model a little unique is the level of care that this model had in its design, building, and post construction analysis. My key point is that based on the post construction analysis by arguably the most advanced yacht structural engineering lab in the world, that the 40.7 and 36.7 were designed to be well in excess of the current design standards. So to the core of my point, if this boat has failed as badly as it has, what does this say about the majority of boats out there that were designed to barely meet this same standard, or worse yet, designed to barely meet some earlier standards which were less stringent than the current standard.
What is nice about Bob's design is that it spreads the load out over a wide area - if this Bene had comparative area of backing to support the keel, it would not so likely have ripped away the fiberglass so easily as it did. Those backing plates aren't any wider than the keel.
But if you look at the photos of the internal structure of the 36.7 in the photo linked in Post 37, you can see that there is a very similar structure to the one shown for Francis Lee, only rendered in composite instead of steel and wood as was the structure on Francis Lee. In the case of the 36.7's there is a dense structural grid around the keel, that is integral with a grid that extend the length of the boat, and which also includes glassed in place longitudinal stringers in the hull. That combination would similarly spread the loads quite effectively in much the same way as Bob's design. My bigger concern is that this type of structure is absent in the majority of boats out there, so if this one failed so dramatically, what does it say about the boats produced to a lesser standard of care.