I just found this post by accident on the Compac sailboat site blaming the keel stepped mast being shoved upwards when the keel struck the rocks for causing a compression fracture of the mast:
"Anybody seen the online pics of the Hylas 47 that dis-masted in the northeast, after striking a charted rock?
It was on charter.
In an even smaller world story, the aunt of one of my customer's was aboard.
Dismasting, was hard to figure, until I got the second hand account from someone aboard. It was a compression fracture, just above the gooseneck (mast-boom joint). With the keel stepped mast, and a nice tight rigging plan (shrouds and stays); upon impact at approx. 7.5~8.5 knots, the keel came up. The mast, restrained by standing rigging, couldn't go up. BOOM. Blew out the mast.
Betcha there was a run on clean underwear shortly thereafter, to resolve the runs in the dirty underwear!"
Link to the post here: