Help! - Picking an appropriate motor, propeller, and ESC

TheRealSeal said:

...I think I saw sometime back that if you go from a 2 blade to 3 blade prop you drop the diameter by 1 and increase the pitch by 1.

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I definitely agree with decreasing the diameter & may want to decrease it by more. Changing the pitch, I not sure it is necessary.

Decreasing the diameter or the pitch will lower the load of a prop (a smaller prop). Adding a blade or using a bullnose prop increases the load (thrust) and decrease the efficiency (watts per gram of thrust). I would only use them when you need more thrust and a larger diameter 2 blade prop will not fit. That is you don't have the room to swing the prop

TheRealSeal said:

How should the prop change when increasing cell count? Just drop the diameter or should the pitch change as well?

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It doesn't matter which you change. With more cells, you simply need a smaller prop. It's doubtful changing only the pitch will be enough.

Those kind of rules of thumb are just that, intended to give you a clue of how things work. They are not absolute rules.

The only way to know is do a prop test any time you change to your setup, that is a new prop size or cell count. On the ground, run the setup at full throttle for 10 seconds or so. Then stop, check the temperature of the motor, ESC & battery by touching them. Warm is OK, but if it&#;s so hot you don&#;t want to hold onto it, STOP. The prop is too big, you need a smaller prop. If it passes, try a 30 second run, then check the temps. If it passes, try a 60 second run. If it passes, go for a fly. It&#;s always a good idea to check the temperatures after a flight. Keep in mind that what works when it 70 may overheat when it 95+.

Watt meters are very useful in testing a new setup, they measure watts, volts and amps. Letting you know of the potential of a problem.

TheRealSeal said:

I know the voltage increases the wattage but why does the current change? How is current calculated or found to know what ESC is appropriate?

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The formula is: Volts x Amps = Watts
If Watts increase either Volts or Amps must change.

TheRealSeal said:

...some said that using an ESC with too high of an amp rating can dump extra heat into the motor?...

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I would disagree with that statement. It's the prop causing the motor to overheat, not the ESC.

TheRealSeal said:

...Is that because typically the ESC would give out before the motor but if the ESC has a higher ceiling then the motor can run without limit and get hotter?...

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I agree with this, it's too much prop causing the problem.

I definitely agree with decreasing the diameter & may want to decrease it by more. Changing the pitch, I not sure it is necessary.Decreasing the diameter or the pitch will lower the load of a prop (a smaller prop). Adding a blade or using a bullnose prop increases the load (thrust) and decrease the efficiency (watts per gram of thrust). I would only use them when you need more thrust and a larger diameter 2 blade prop will not fit. That is you don't have the room to swing the propIt doesn't matter which you change. With more cells, you simply need a smaller prop. It's doubtful changing only the pitch will be enough.Those kind of rules of thumb are just that, intended to give you a clue of how things work. They are not absolute rules.The only way to know is do a prop test any time you change to your setup, that is a new prop size or cell count. On the ground, run the setup at full throttle for 10 seconds or so. Then stop, check the temperature of the motor, ESC & battery by touching them. Warm is OK, but if it&#;s so hot you don&#;t want to hold onto it, STOP. The prop is too big, you need a smaller prop. If it passes, try a 30 second run, then check the temps. If it passes, try a 60 second run. If it passes, go for a fly. It&#;s always a good idea to check the temperatures after a flight. Keep in mind that what works when it 70 may overheat when it 95+.Watt meters are very useful in testing a new setup, they measure watts, volts and amps. Letting you know of the potential of a problem.The formula is: Volts x Amps = WattsIf Watts increase either Volts or Amps must change.I would disagree with that statement. It's the prop causing the motor to overheat, not the ESC.I agree with this, it's too much prop causing the problem.

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