Which 3 F16s are you looking at?? I see two - the Nacra F16 and the Viper. None of the others fit within the F16 box rule.

That said, I don't think the voting is very surprising. The Nacra F16 is almost certainly a fine boat, but just a completely unknown quantity to practically everyone here. The Viper OTOH is very well known, so if a particular F16 design were going to be chosen, it's natural that people here would favor something with a well-documented track record. Who knows, perhaps the trials will turn up something we don't know.

If the third boat you were referring to is the Spitfire, well it just doesn't have much of an international presence.