This will calculate how much power (watts) and amps is needed to go a certain speed in a specified amount of time. This will also calculate the motor KV necessary and RPM necessary. When the form is submitted, a new window will open and results will be in the first line of the table. Allow pop-ups in your browser. Note: This calculator can be used in tandem with this brushless speed caculator. This javascript/HTML calculator is used to find the approximate maximum speed of your Brushless Motor powered R/C vehicle.
Default transmission ratio is 1:1.  If your vehicle has a transmission, enter its drive ratio here.  i.e. a Team Associated TC4 has a transmission ratio of 2.5.
Drag coefficient for cars ranges from 0.25 (very aerodynamic) to 1.20 (not very aerodynamic).  Most high performance cars are around 0.35.



Li-po cells have a nominal voltage of 3.7v/cell
Efficiency of electrical system as a percent. Power is lost due to electrical resistance in wires and connectors.  Inputs can be from 0 to 1. High quality motors have an efficiency of 0.85 or higher.  An efficiency of 1.0 (100%) means that all electrical power is converted into motion without heat loss or friction losses, which is impossible. 
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