RE: what motors
Hi Guy's if you want more power why don't you just try running a 8.4 7 cell battery pack... on most all rc's i ever had that run on 7.2Volts all there electronics can handle running on 8.4 volts also... I never did it but it should work...... alot less strain than putting in lower wind motors.
you probably will have to get a 8.4V pack with one cell on the top (hump pack) and grind a hole in the tanks battery holder compartment for it to fit.