Suddenly the team found themselves alone on
the beach. Hal went to phone Bob Parks, the Senior
Engineer responsible for mechanical design, with the
news. No matter that over in California it was three in
the morning! Juan Cruz, composite structures mastermind,
summed up feelings by his comment that without
the crash, which underlined the craft’s fragility, it would
all have seemed too easy. Project Engineer Jean Joseph
Cote added, ‘That wasn’t a crash - that was a happening!’
--Man's Greatest Flight
http://web.mit.edu/drela/Public/web/hpa/SG_HPAG_daedalus.pdf
The independent agency USHGRS rated J-J with an H-4 life rating.