Originally Posted by edpare
Where did you get this information? I'm new to electric flight and I need to figure out what kind of system to power a Nitroplanes L-4 cub (around 4 1/2 pounds).

www.motocalc.com
Free for 30 days, then around $40.00 for forever.
You can pick from databases already there or use your own, for motors/props/speed controls/ packs/airframes.
Take a look and play with it.