also, the pack that the receiver and servos use is a 650 mAh. I think a 600 mAh pack would work better. Again, it's lighter than the 650, which is very good. Here is what I would like to equip the yak with:

4xhs-425bb servos
600 mAh reciver pack
4S-4000 mAh motor battery
Supreme II 8 channel receiver
Engine: Z4020-14
ESC: TITAN 80 OPTO
4 channel transmitter for now, later change to 6 channel

That seems ok, doesn't it?

eric