The 650 is a Maxi Sports-Cruising Cat with the obvious racing pedigree of  Grainger Designs' and with speed and comfort for  exhilarating sailing in blue water conditions. Most cats are sailed below their maximum potential on ocean crossings due to the "Sea-state vs Crew Comfort vs LOA" Equation. The first 650 has been designed for a client  well-experienced in ocean cruising. 

The concentration of volume amidships and the lack of overly exaggerated  long ends provides usable room along with a stable ride. There is room enough for most combinations of families or groups of friends. There is also room for a live-aboard professional working couple, with space for hanging good work-clothes, a decent sized office, a laundry, a workshop, and the cruising gear. Modest-sized diesel saildrives provide auxiliary power