Juli 18, 2024

Brushless Motor Evaluation with the Eagle Tree V4 Data Logger

After cranking up timing on my LRP X22 10.5 stock spec to 50 and running it like this with two fans (just precaution) at my first astro race, i decided to meter its specs. I noticed during training with 48 degree timing that it was already quicker than my new 7t mod motor, what seemed quite impressive to me. For now i will not go beyond 50, because a power draw of 14 amps means a lot of idle power draw. During next training i will measure current on track because i want to find out how idle power draw converts to power draw under realistic load.

Here are the results of my measurement session with all my motors except the LRP X20 17.5. They were conducted with an eagle tree v4 logger, brushless rpm sensor and powerd by an LRP Flow X Competition ESC. I don’t know how accurate the rpm sensor is but the spec rpm of the k7 is 4300kv, so it’s possible, that rpm measurements are 500kv or around 10% too high.

Model

Timing

ESC/Turbo

RPM

@Voltage

Current

KV

Hobbywing G3 6.5

N/A

0

N/A

N/A

N/A

5000

Hobbywing G2 10.5

N/A

0

N/A

N/A

N/A

3800

Ruddog RP540 7t

36

15

50.000

7.35

15

6800

Ruddog RP540 7t

36

0

45.000

8.4

5.5

5400

LRP X20 4.5t

27.5

15

62.000

7.35

15

8400

LRP X20 4.5t

27.5

0

68.000

8.4

9

8100

LRP K7 8.5t

N/A

15

50.000

7.35

3.5

6800

LRP K7 8.5t

N/A

0

37.000

7.26

N/A

5100

LRP K7 8.5t

N/A

0

41.000

8.4

N/A

4900

LRP X22 stock 10.5t

40

0

39.000

8.3

5

4700

LRP X22 stock 10.5t

44

0

43.000

8.3

7

5200

LRP X22 stock 10.5t

46

0

46.000

8.3

8.5

5500

LRP X22 stock 10.5t

48

0

51.000

8.3

12

6100

LRP X22 stock 10.5t

50

0

55.000

8.4

14

6500

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