I built the tank for my last Ringmaster for that reason. It is a uniflow, 2" wide, by 3" long, and 1&3/8" deep. I ran the feed tube out the side of the tank, just below the "v" so that it is behind the front of the tank by about a 1/4". Seems to work well with the McCoy 35, except for a slight richening toward the end of the flight.