Orme's law is a rule of thumb to assist modelers when they design an electric power system for their Radio Controlled Model. Orme's Law simply recommends the use of one NiMH rechargeable battery cell for every 35 square inches (230 cm2) of wing area for sport planes. One cell for every 50 square inches (320 cm2) of wing area for trainers. When using LiPo cells with higher voltage, the number of cells is cut in half, since a LiPo cell has double the voltage.
Read more about Orme's Law: Origin, Need For Orme's Law, System Selection
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