RE: 41 Falcon cat build
I srt the CG at 34% due to the fact the falcon likes to fly at speeds over 65mph. I also added nylon tail skids for a tail dragger airplane that are at a 45 degree angle inside the pickle fork on each side at the front of the hull about 2 inches from the tip. An Octura 1475 Pitched to 5.3 inches with the drive tube 1/2-5/8 of an inch from the bottom of the hull center. The larger tube thru the hull and the smaller one slip inside. I drill the smaller tube and braze / solder a small verticle tube so I can oil the shaft without taking everything apart each time. Here ids the falcon running at 70 mph on a small lake.