In case if you try to fir a heavier propeller on low torque type motor, it will not be able to achieve the desired RPM value or will not be able to generate enough torque for spinning. If you have high torque value for your motor then it means it is capable enough to run much heavier props but will also suck more current. It will also lead to lesser propeller wash. If your motor has high torque value then it will naturally lead to snappy response as RPM will accept faster changes. This change ultimately decides responsiveness of drone in air. The torque range helps to define the ability of motor to shift between RPM values. Never forget to check thrust/current ratio while buying new motor for your drone. It will also cause voltage sags for your batteries.
When you connect motors having low efficiency to your drone unit then you have to make lots of compromise for flight time as well as energy. There are chances that a motor could be efficient with its lower throttle range in that case they will lose efficiency with increasing current range at higher limits. Professionals recommend choosing a motor that has efficiency value near about 7 or above this. now, if you have higher value of g/W rating that means your motor is more efficient and it will assist drone in longer flights. The formula used for calculation of motor efficiency is “thrust/power used in W” its overall unit becomes g/W. Means thrust must range somewhere around 1360 Grams where each motor must be capable enough to produce 340 grams thrust.Īnd in case if they are able to produce higher thrust then this rated value, your drone will naturally become able to move with much faster speed. Let us consider a situation: suppose your drone have overall weight of 650 grams then we need to pick a motor that can generate at least twice amount of thrust. This is a very essential parameter as it means your motor is going to have additional thrust to keep your drone safe during windy weather or at the time of flight maneuvers. It clearly means that your selected motor must be capable enough to produce about 50 percent higher thrust as compared to multi rotor. Thrust to weight ratioĭo you know the golden rule for selection of drone motor? It must allow your drone to hover in the midair with half throttle. Your decision will help to maintain speed of drone in air and this weight will also contribute in flight time adjustments. Whereas the idea about size and weight of propeller will help users to know about the overall thrust of motor that they will need for perfect lifting of drone during flights. Once you know the overall size of frame then it can help you to determine right propeller size. But note that the list must include all parts like payload (if you are connecting gimbals and camera), battery unit, motors, wires, PDB, flight controller and frame of the device. You can have approximate weight idea for your drone by simply calculating weight of its individual parts or components.
The very first criterion for selection of right motor for your drone is to have clear idea about overall weight of drone itself. Part 1： Things to consider when choosing drone motors 1.
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