I've taking on the task of building a topflite .60 size F4u Corsair. I've been flying a couple of years but this is my first kit to build. I plan on using mechanical retracts, actuating each strut with a Hitech hs-75BB, and would like to have one strut lag behind the other during retraction/extention. A friend advised me to solder a resistor into one of my servo leads to slow the servo down but that seems a little radical. Any thoughts on that? Now my next question: I will be using 2 retract servos and 6 Futaba S3004's for the rest of the aircraft (I'll have working flaps) and I'm not sure what size battery to use. Should I go with 4.8v and a high mAh or try a 6.0 with a low mAh? Any suggestions on these two subjects would be appreciated.