Feiago 8s and 7018?

[RC-Monster Mike]

Yes, either warrior controller will need a receiver pack. The UBEC provides a constant 6 volts to the servos by using the main battery packs and a voltage regulator, and is an excellent product for folks using 12-30 cells on controllers that either don't have a built in bec or the bec on theier controllers isn't rated for the high cell counts they use. Most controller becs only provide 5.5 volts to the servos as well, so the UBEC allows slightly crisper steering response with its provided 6 volts .