gday all, MB has some good electric air-boat plans , but the USA flying models mag.,carstens , has a glo air boat plan for a .19 glo, which could be blown up for a bigger motor.
google up air-boats , theres a few in USA, inc. a cat hulled one , address escapes me +flying models mag yrs ago ran a modified one , king toad, which had a pumper carby on it , tank in hull+a groove in the top of the hull , too lower the motor even further , approx, 25mm into top of hull .
these are fast , simple models , and heaps of fun
regards bill