Thanks for the advice! Well, I've got two different Thunderpower Lithium polymer 3-cell packs. I only intend to use one of them of course and one is spec'd at 3 oz. with capacity is 1320 mah @ 11.1 Volts. Also, once I got the hang of flying it unloaded, I was considering strapping on my handheld GPS unit (5.3 ounces) for some documentation of speed, altitude, etc. What do you think? I understand how critical CG can be as I work in the aviation business. I assume that it is better to have your CG too far aft than fwd. Does this mesh with what you've experienced? -phog