The next picture show ITA 111 to be an Aquaraptor.

http://www.formula16.net/content/view/102/1/lang,en/

So I guess ITA 1 is a Blade F16

ITA 1 Blade F16 riccardo ceriani & elia mazzucchi
ITA 111 Aquaraptor F16 federico farina & luca bertani


Paul Warren en Anne Powter own a Falcon F16 and I expect them to have brung that boat with them

FRA 515 of eric noyau is probably a Stealth F16 as they are basically the only boats with numbers in that range. There were a handful of Blades with 500 numbers but that soon changed to the 700 series. His boat with red and white sails is in the pictures and his hulls do appear to be Stealth like, however his boat is hidden from view mostly.

Wouter