^^The difficulty is that:
(1) to get the boat
builders to change you (probably) have to change the ISO standard, which is near impossible to do. I tried for about 5 years to get a couple rudder
improvements into ISO and found it to be an impossible process.
(2) the builders will say this keel
particular failure has only happened once, on a boat
that was "rode hard and put away wet" - a pleasure boat that was really inappropriately put to commercial
use. And Bendy (at least) do not believe they are making a 'forever' boat - just for instance they have speced their thru-hulls/sea cocks for a 7-10 year life and they believe their customers are fine with that. So, they will say, the report is actually correct as written and John is wrong.
I personally think there is a place for both a 'forever' boat in the market, and for a '10 year possibly disposable' boat. . . .and it's a case of Caveat emptor for the buyer to know which is which.
I do think John is wrong when he says it is relatively easy and relatively inexpensive (using today's typical boat building quality standards) to make an e-glass laminate structure for a thin fin keel
that can withstand multiple 8 kt groundings without damage. I happen to know its hard to accomplish even with an aluminum
You can certainly make a 'better' structure than this glued in grid (just doubling the amount of e-glass and making the bolts bigger would of course help), but an 8kt impact on the bottom of the keel on a granite ledge (just for example) is a serious shock load for any structure. In fact the greatest reduction damage could come from elasticity/deformation measures added in the potential impact zone (eg crush boxes) . . . . more leverage there than in changing the keel attachment structure. Structurally, putting the keel in a socket is the 'best' structural solution but that is not extremely inexpensive, nor that easy to engineer
and will impose on interior
space (in a shallow bilge
boat like these are) . . . boat designers certainly know of that solution and there is a reason the boat builders do not do it.
Regarding his aircraft analogy, I get his point, but airplane wings are not expected to survive impacts with tree trunks! And thin keel boats probably need extensive inspection
after a hard grounding no matter the structure.