One of the things that we fight in electric flight is the efficiency of the electric motor. Even the good off the shelf stuff is frequently not at its best as a trade off in manufacturing cost and longevity of a product. This fellow at fly electric website builds his own motors and especially the copter folks might want to take advantage of the work he has done.
Motors are not usually the efficiency bottleneck though. Weak (floppy) props waste a great amount, as do overly flat (CF lasercut) frame arms. For me the number one efficiency waster was the (proprietary) controller. The affinity setting would as much as double the flight time if set properly (it controls how rigorously
are corrections applied - low setting makes the craft drift a lot but fly longer, while higher values make it hover stable in one spot with greater expense of power).
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are corrections applied - low setting makes the craft drift a lot but fly longer, while higher values make it hover stable in one spot with greater expense of power).