Hi, i tried my exceed sword out a few days ago...it is the RTR they sell with the 50 amp esc...I was impressed with the power and the fact it is completely water tight.. But first I had to remove all the hardward and seal with silicone since it took on a lot of water in bath tube... I used a 4000 mah gens ace 25c battery put it all the way forword for my first run...I also was using cheap plastic stock prop..What happen next really surpised me... It makes high speed sharp turns very easy,but some how i nosed under the water and boat disappeared...30 seconds later it popped back to surface 20 feet away from where it disappeared..I swam out and retrieved it and it was completely bone dry inside ... But wear the flex drive inserts into drive shaft (which is a straight tube supported by ball bearings front and rear)it came appart... went home fixed,just not sure it will hold... Can anyone recommend a good metal or carbon prop for this model.???..and does anyone know where to buy spare drive shafts...I also have a supervee and the drive is all flex drive with bushings and never had any problems... But,i like the ball bearings front and rear on the 630ep, zero fiction...So i am hoping my drive was just a crappy one and i can keep existing drive setup for a while..Any help is appreciated..thanks