I've been pondering this for awhile. Given the fact that a copter of any sort more or less maintains altitude by pure brute force, dawdling along at 5 or 10 mph is not going to give us the maximum range. But then, we've probably all gotten the "Propulsion output is limited.." warning towards the end of a charge, which tells me that balls out full speed is not the best way to make it home on a low charge. Which makes sense, because at some point, wind resistance on the aircraft itself will nullify the benefit of increased airspeed. So, there's got to be a sweet spot, right? Anyone know what it is? I'm thinking of trying some Litchi missions, all identical except for speed, and see where the bird comes home with the most charge remaining.