(C)update: Young America/USA 53

 After several weeks of investigation Young America and their designer Farr International have released findings on why USA 53 failed. 

One finding is that the incident " was not a result of a fault in the engineering or design of the boat."

Due to the event their have been modifications to their second boat  USA 58.  According to Young America, "This has included mechanically fastening areas where the skin to core bonds are suspect, and secondary stiffening to support primary load bearing members."

After the incident it was thought that the fault could lie in any of 5 areas: structural engineering, design, crew error, construction or materials.

The above statements seem to say that at this point materials are the leading cause.  

Repairs to USA 53 are continuing.