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# Questions tagged [motor]

An electronic component that creates torque (rotational force) when electricity is applied.

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12 votes
2 answers
1k views

### What does KV mean on motors?

I've seen ratings on brushless DC motors like this one for something called KV. What does that rating mean?
• 6,008
16 votes
3 answers
583 views

### How do you figure out which motors to use for your UAV?

There are a ton of electric motors on the market. Is there a mathematical formula or some other means of figuring out which size of motor you will need for your airplane, helicopter, or drone?
• 271
8 votes
2 answers
18k views

### Why do brushless motors have 3 wires compared to 2 wires on a brushed motor? [closed]

I'm familiar with regular DC motors, which is what brushed motors appear to be. They have fixed stator magnets, rotor coils connected to the shaft and two brushes that power the coils at the right ...
7 votes
3 answers
1k views

### What process should I use to ensure my motors are spinning the correct direction when using Betaflight

I heard that a lot of problems occur due to one or more motors spinning the wrong direction. What process should I take to ensure that all my motors are spinning the correct direction if I'm using ...
• 751
4 votes
3 answers
1k views

### Why do higher voltage batteries need lower KV motors?

I've noticed that higher voltage batteries need lower KV motors, why is this?
11 votes
3 answers
9k views

### How can I reverse the direction of a brushless motor?

I have a brushless motor on my RC plane. After connecting it to an ESC and testing it I've found that it is spinning in the wrong direction. How can I reverse the direction the prop is spinning?
8 votes
2 answers
409 views

### How to keep my prop from flying off my motor?

After finally getting every piece on my plane to work, another piece decided to be a problem. Great. My problem is pretty much already summed up in the title, my prop keeps flying off my motor, and I ...
5 votes
2 answers
128 views

### Does motor KV requirement scale linearly with voltage?

There have been myriad questions regarding motor KV, such as this one. Many of these come close to answering my question, however none have given me a definite answer. If I am picking motors for a ...
• 4,422
5 votes
5 answers
614 views

### What affects the total flight time for a drone?

What factors would affect a drone's flight time? Battery capacity? Weight? Anything else?
4 votes
4 answers
2k views

### How should one chose the correct motor KV for a build?

For a 5 inch, 4S build, the general advice is to go 2300-2750KV. For the same size but 6S, it should be ~1800KV. However the same motors could be used on a 4S 7 inch quad. And all of this scaling ...
• 4,422
1 vote
1 answer
55 views

### Is there a calculation to find what motor is required for a specific propeller?

So I am going to be running 20x5.5 carbon fibre drone propellers at 10,000 rpm maximum and I cannot find out which motor I need. I have been scouring the web for weeks and I have given up and I am ...