[cb18]

What medium-sized quadcopter has an hour long flight time?

Is this something you follow very closely?

Do you know of any write-ups on the economics and other feasibilities of drone delivery?

Seems like for a cargo of any much heft and a delivery distance beyond a handful of km a battery improvement of 3x is a good start but still wanting.

I may be off base here and drone delivery may in fact currently be more feasible than I suspect. I'm mainly basing this thinking on the 20-30min flight times of current prosumer camera drones. I know there're other kinds.