Headspeed Calculator
Enter your electric helicopter setup and see the headspeed and any other unknown value calculated live as you edit. Great for testing out different battery, motor, and gearing combinations to find the best setup for your flying style.
Live result
Enter your setup and the calculator estimates headspeed live.
Headspeed
2055
RPM
Solving for
Headspeed
2055 RPM
Gear ratio
9.33:1
Main gear / pinion
Live result updates instantly as you change your setup.
Solve for
Choose the setup value you want HeliCoach to calculate while you edit the rest of the inputs.
Power system
Battery, motor, and ESC inputs for the live calculation.
Battery cells
Battery cells in series, from 2S to 14S.
Voltage per cell
Nominal cell voltage. Defaults to 3.70V.
Motor KV
Motor RPM per volt constant.
Motor efficiency
Estimated drivetrain efficiency at the motor.
ESC power
Throttle / ESC output percentage.
Headspeed
Main rotor revolutions per minute.
Drivetrain
Use the original formula inputs: pinion teeth and main gear teeth.
Pinion teeth
Motor pinion tooth count.
Main gear teeth
Main gear tooth count from the original formula.
Quick defaults
Good starting points for a nominal-voltage electric setup.