how fast can a quadcopter fly, how far, and how much can it carry? seems like this would only work well in limited contexts, like, say, small deliveries on a pa

how fast can a quadcopter fly, how far, and how much can it carry? seems like this would only work well in limited contexts, like, say, small deliveries on a particular campus or within a single large building or complex. not to be a complete nay-sayer, but the limits of battery tech are a bit harder to overcome than most software problems.