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Performance Predictors

Online calculators to predict airplane flight performance.

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Propeller Thrust Calculator
Pick a prop from the list, select the type of input (RPM or Thrust), provide a value, and this calculator outputs the output (needed RPM or delivered thrust).
An accurate motor efficiency and thrust calculator by Rod Badcock
Scorpion Calc and head speed calculator
Scorpion calculator for their motors, both propeller and helicopter head speed calculators.