I haven't any experience with super caps. I was just postulating a possibility for a solution. It probably isn't the best solution, but it offers food for thought. And from what I've read since my post it appears some people are starting to think along the lines of a super cap. I know I don't have all the answers. And sometimes my answers are just plain wrong. I'm not special in any way. I just like to sometimes throw out an idea and see where it goes. Light weight and cheap - I get that. Makes perfect sense to me. And I never thought of a 50F cap - geez, that'd be pretty dang big and the Q-copter couldn't fly under that weight. Also, the reason why I went with the SC (super cap) was to avoid having to change batteries (as with AAA's) or placing a lithium battery that will need to be charged before the flight, otherwise one could forget to charge it and crash, then have a very hard time finding the QC.The problem is that a 50F supercap is considerably more expensive than the LiPo battery, and a typical 50F supercap is only rated at 2.5v so in practice you'll need 2 x 100F in series, 3x the price of a small LiPo.
Just wanted to present an alternative thought to carrying an on-board battery which would be heavier than a SC.