Thank you, David, for your exposé. Please note that my interest in foils is not racing but cruising, thus, not to gain speed but to gain comfort in waves. If safe foiling would mean going slower in heavier seas that is a price I would be willing to pay. Going proa is for the same reason: a longer lw hull is better in motion. So I was thinking that a long  lw hull would  still be necessary in seastates that would surpass the capacity of the foils. This probably also means that the flight height would not need to be so high as to prevent the potentially dangerous speed bumps of all but the most freeky waves as in racing. Any catastrophic fail would be essentially an uneventful low height fall. In any case, the operational MTF (mean time between failures) of a foil will be worse than for the hulls, but not much worse than for the currently proposed rudder/boards. 

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