So I got a drone kit from aliexpress , it came with a 40A rated ESC(4 of them).I am about to buy a 2200mAh battery(3S type).I just wanted to know what flight time I can expect with this setup??
You haven't given us enough information. What battery do you have now, and what flight time do you get? Do you have any specs for the drone?
it came with a 40A rated ESC(4 of them).
What? I'm pretty sure you don't have 4 40A motors... At 12V, that would be a couple of horsepower!
What's ESC? Electronic Speed Control?
That kind of thing is extremely difficult to calculate and there's a ship-load of variables, but I'm not an aeronautical engineer so I wouldn't know where to start... The best way to find the flight time (or lifting capacity, etc.) is to experiment. If you have some starting flight-time information (with a particular battery) you could adjust/estimate for a more powerful (or less powerful) battery of the same weight.
But, I'm pretty sure the relationship between flight-time and weight is not linear.... If you double the total weight of the drone, you probably won't get half the flight time, you probably won't get off the ground. The relationship to mA-hr probably isn't linear either.
Flight time will depend on the actual current the motors use and that will depend on what motors they are, what propellers they have on and how hard you fly.
The most basic arithmetic says that if 4 motors are using all the 40A that the ESCs allow then that's 160A total. A 2.2Ah battery a) probably wouldn't supply all that current and b) if you could get 160A out it would run the motors for less than a minute. That sounds like a rather small battery for what is probably a fairly large drone.
But unless you can find someone with an identical setup then you won't actually find out until you've built it and measured the current it uses.
Steve
slipstick:
Flight time will depend on the actual current the motors use and that will depend on what motors they are, what propellers they have on and how hard you fly.The most basic arithmetic says that if 4 motors are using all the 40A that the ESCs allow then that's 160A total. A 2.2Ah battery a) probably wouldn't supply all that current and b) if you could get 160A out it would run the motors for less than a minute. That sounds like a rather small battery for what is probably a fairly large drone.
But unless you can find someone with an identical setup then you won't actually find out until you've built it and measured the current it uses.
Steve
I think i messed up by confusing the ESC's rating with the motor's rating.Just found out the motors are actually rated at about 6.5 A (max).