When dealing with electrically operated radio controlled model aircraft, there are a few components that you need to understand. Let us start with speed controllers. What does this component do?
The speed controller is the component that is used for controlling and distributing the power to your electric radio controlled model aircraft. It also controls the amount of power that the motor will deliver. This in turn determines whether your radio controlled model aircraft will go faster or slower.
It is always a good idea to get aa controller that has a higher amperage rating than your motor. IE if the motor deliveries 30 amps burst power then you should consider going for a speed controller that is rated at 40 amps. This will protect the electronics of your remote controlled aircraft.
There are three ports used in a radio controlled model aircraft speed controller, namely the battery, motor and signal cable ports. It is very important to connect your cables correctly on the battery side. If you swap them around on the motor side it will not be a problem, but on the battery side you stand an excellent risk of blowing your electronic components.
Most are fully programmable and have handy functions like low voltage protection or propeller brake function. Be sure to read the instruction manual that comes with the speed controller to understand the features and functions of that specific controller.
Now days most on the market are designed to use lipo batteries. I will cover lipos in another article, but be sure to read up about the dangers involved in lipos before you handle them.