RE: New Italian Q500
I would think a V-tail with the leading/trailing edges even with the top of the fuse side corners so there are no 90 degree angles would be ideal to reduce drag which is the whole idea for going faster with the available power being roughly equal. While the original design may look cool, it as a lot of long 90 degree angles amoung other hings. IMHO... a cool looking airplane is the one out front with the 1st place or fast time trophy!
Dan