Fixed wing aircraft are far more efficient, enough so that lipo batteries are pretty practical. Many drone delivery concepts I've seen are a hybrid fixed-wing w

Fixed wing aircraft are far more efficient, enough so that lipo batteries are pretty practical. Many drone delivery concepts I've seen are a hybrid fixed-wing with vertical take off and landing. Amazon appears to be an exception. The only image I have seen of their drones is a traditional multirotor, and they claim to be aiming at a ten mile range with a 5 pound payload.