No mate, YOU just don't get it.
There is no meaningfull difference in hull volume between the modern F16's and the Viper.
The F16's simply don't need hulls as big as say the nacra Infusion because they don't require anywhere near the displacement of those designs. The F16 hulls are 10% shorter in length and only need to carry 75% of the weight of a F18. Ergo F16's hulls are more narrow for the given length.
The Viper performance comes from the development of the rig and not because it is pushing fatter hulls through the waves. Last time I checked, fat hulls actually amount to more drag in such situations.
The stiffness argument is BS, If the standard F18's (Tiger, NF18) flex by as much as 95 mm in the test then there is no way that a large performance difference can be explained due to 10 mm difference in flexing between a Falcon/Stealth/Aussie Blade and the Viper with all of the latter below 30 mm flex anyway. Note that if the F16's had been of the F18 platform weights then they would only flex in the test to 60 mm or less, still 50% better then the F18's !
Last time I checked the Tiger crews were by far most often World Champions F18: Hell that fact could even be used to argue for reductions in stiffness !
I state and truly believe that a nomex/carbon/unobtainium/diamond inlays 100.000 bucks F16 with a few hookers as pit crew will be just as fast on the water as a 19.800 bucks race version of the Falcon/Stealth/Aussie Blade F16's or indeed any of the modern F18's
That is all the formula F16 class rule set has to do.
No Stephen, you have been beating this dead horse for 4 years now. I can't count how many times you've hinted that you would buy a F16 for yourself but eventually didn't.
Give it up mate, your are not going to impress your world view on the F16 class. So make a decision, get-with-the-program or get lost !
Wouter