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Compatible Battery? HELP :D

#1
Hey everybody. I'm building the FT Flyer and I think I went a bit overpowered on the ESC and Motor, but it's already been purchased.

Here's what I got:
A2212 1400KV 10T brushless outrunner motor

KV: 1400 10T
Max. efficiency: 80%
Max. efficiency current: 4-10A (>75%)
Current capacity: 12A/60s
No Load current @ 10V: 0.5A
No. of cells: 2-3 Li-Poly
30 AMP Brushless motor
Power Input: 7-12.6V(2-3S Li-Poly, or 5-12S Ni-MH Ni-MH/Ni-Cd)
BEC: 2A
Continuous Current: 30A(40A for 10 seconds)


with all this being said, I had some questions.

1) does the continuous current speed mean that's how much it takes out of the battery? So if I had a 1000 amp battery, divided that by 1000, x0.8, so thats 0.8A capacity, dividing by the 30 amp continuous speed, and multiplying it by 60.... it's only around 1.5 minutes? Am I doing something wrong?

2) What battery would work with this? The FT Flyer is a light plane and I was considering this https://www.motionrc.com/products/a...xt60-connector-epr10003x6?variant=41779973772

hoping its all compatible. I have so many questions and EVERY bit of advice is appreciated.
 

Matthewdupreez

Legendary member
#2
Ok
Hey everybody. I'm building the FT Flyer and I think I went a bit overpowered on the ESC and Motor, but it's already been purchased.

Here's what I got:
A2212 1400KV 10T brushless outrunner motor

KV: 1400 10T
Max. efficiency: 80%
Max. efficiency current: 4-10A (>75%)
Current capacity: 12A/60s
No Load current @ 10V: 0.5A
No. of cells: 2-3 Li-Poly
30 AMP Brushless motor
Power Input: 7-12.6V(2-3S Li-Poly, or 5-12S Ni-MH Ni-MH/Ni-Cd)
BEC: 2A
Continuous Current: 30A(40A for 10 seconds)


with all this being said, I had some questions.

1) does the continuous current speed mean that's how much it takes out of the battery? So if I had a 1000 amp battery, divided that by 1000, x0.8, so thats 0.8A capacity, dividing by the 30 amp continuous speed, and multiplying it by 60.... it's only around 1.5 minutes? Am I doing something wrong?

2) What battery would work with this? The FT Flyer is a light plane and I was considering this https://www.motionrc.com/products/a...xt60-connector-epr10003x6?variant=41779973772

hoping its all compatible. I have so many questions and EVERY bit of advice is appreciated.
Ok so say, the motor pulls pulls 12 amps at full throttle. And you're using a 1000mah lipo,. Now if you were pulling 1 amp. (1amp hour) it would last 1 hour but now that you're pulling 12 amps hours. It'll last a twelfth of an hour ... Aka 5 min . So 5 min flight time flying at full throttle ( which you don't normally do) so a minimum of 5min.
 

quorneng

Elite member
#3
Donity
The only penalty for over specifying the motor and ESC is the extra weight involved. This can be significant to achieving the correct balance point if the motor is mounted in the nose.
Remember it is the motor and its prop that sets the maximum amps that will flow. You just have to make sure that the full power amps are within the capability of both the motor and ESC. A motor can withstand a considerable over load for a short period, The electronics in the ESC much less so,
A watt meter is a good tool for doing this