I have a queen bee ran it in a boat it had more torque than a TD low end for sure no stalls on launch. Weight in a boat was not an issue was why I tried it. I have another one now in mint condition and have read 25% nitro with a 6x4 can get it running happy at 18.4k static. I have ran the QB in a plane back in the 90s the plane flew fine just not a speed demon. If you add a pressure tap on the tank a nelson plug and 35% nitro I would imagine a modern design 6x4 could have the right plane design flying reasonably fast. Has any tried a .09 cylinder and piston to see if it will work the the crank and case?