RE: ESM 74
If you are going to need weight up front put the biggest pack you can fit to make up the weight needed. If not a 3300 Mah pack would be plenty. Hope you have a programer for those servos. Why you ask, because there is a good chance they will be off center and humming. With the programer you would set the center with all surfaces at neutral that way the servos stop hunting trying to find the center point. Saves you from having a premature dead battery. 2.4 Rx along with digital servos are energy hogs. They are not like the analog servos and 72mhz Rx. Bottom line is when your radio is on, your plane should be silent when everything is at neutral. If not you better fix it, or one day it may catch up with you. If you don`t have a programer , get one if you will be on the digital band wagon.
BTW. most guys using digital servo don`t know that they SHOULD be using the programer. They fly with the servos humming because they think it is normal for the servos to hum. Wrong.. It is not. It is the same like the buzzing in the analog servos when there is binding somewhere. But it is up to you. Just keep checking the RX battery after 3 flights to make sure all is good.