​FLIGHT FIXIT

          The motors that are used for a quadcopter are very specialty pieces of equipment. They are called outrunners, this means that instead of using an axil that runs thruugh the middle of the motor, the entire outside of the motor spins. This gives the motor lots of strength, even though it is small. 

 

          The strength of a quadcopter motor is measured mby the thrust that it pulls, and by the KV of the motor. The KV stands for the Rotations Per Minute Per Volt of electricity. So if i am using a 3 cell battery that is giving off 11.1 Volts then a 1000 KV Motor would be spinning at full speed 11100 RPM's. The faster the motor can spin does not mean better though, usualy the slower the motor spins the bigger the propeller it can hold. You can think of it like a car, when you put a car into a low gear it spins slower, but has more power. 

 

         So, because of this knowlege you can see that the lower the KV, the better the motor, and the more thrust. But because the motor is spinning slower you would use a larger propeller, and thus you would be getting more thrust. 

 

          There is a common rule when you pick your motors, you want the motors to have a combined thrust that is double the total weight of your copter. This will give the copter the optimal efficiency, and speed. 

 

         When you are building a copter that is made for speed it is better to go with motors that have more than double the thrust than the total witight of your copter. This will make it have the ability to go faster. But remimber, the bigger the motors the more power that they will use, and im some cases, shorter flight times. But you definitely want to make sure that you have properly graded motors for your type of copter. Remimber the rule.