we have designed an air propelled boat ....

components used:
1)Emax 2812 motor (120 watts approx)
2)Emax 18amps esc
3)aquaprop
4) Futaba S3003 servo

we are designing boat for sp4mm3r that is water propelled ..just for experimentation we made this air propelled boat ...in test running it was giving almost 650gms of thrust (not accurate as measured with whole assembly).
videos will follow

pankaj

Pankaj..see my postings on this craft...and see video...http://www.youtube.com/watch?v=EV4RnsjOzvA

http://www.rcindia.org/boats-kites-trains-and-all-others/its-l-4-my-rescue-craft/msg47576/#new  try it...its simple...all with reworked toy motors...