System Selection
Matt Orme’s rule makes system selection easy. Orme’s law assumes that the hobbyist will be using 1700 to 2000 mAH cells and will prop for 4 minutes of flight, or 30 amps. 2000 mAH = 2 amp hours or 120 amp minutes, hence the 4 minute flight time (120 amp-minutes /30 amps) at full throttle, with increasing flight times at reduced throttle settings.
Applying the rule using a hobbyist's Citabria Pro electric conversion, which has 560 square inches (3,600 cm2) of wing area, it needs exactly 16 cells according to Orme's law. Before Orme's Law, much more work was needed to design the power for the system.
Read more about this topic: Orme's Law
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