This app helps you determine the number of cells that are necessary for powering a RC speedboat with a given prop size (diameter measured in mm). The recommendations serve as basic guidelines only since there are way too many variables and unpredictables in the equation.
Android: https://play.google.com/store/apps/details?id=com.rcpress.prop
Windows & iphone: https://fingertainment.itch.io/find-out-how-much-battery-power-you-need-given-a-particular-prop-size
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