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Cobra
CM-2820/24 490Kv Motor Propeller Data |
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Magnets |
Motor Wind |
Motor Kv |
No-Load Current |
Motor Resistance |
I Max |
P Max (6S) |
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14-Pole |
24-Turn Delta |
490 RPM/Volt |
Io = 0.53 Amps @ 15v |
Rm = 0.111 Ohms |
27 Amps |
600 W |
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Stator |
Outside Diameter |
Body Length |
Total Shaft Length |
Shaft Diameter |
Motor Weight |
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12-Slot |
35.0 mm, 1.378 in. |
46.4 mm, 1.827 in. |
52.6 mm, 2.071 in. |
5.00 mm, 0.197 in. |
146 gm, 5.15 oz |
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Test Data
From |
Input |
12.0 V |
15.0 V |
18.0V |
21.0V |
Measured Kv value |
Measured Rm Value |
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Sample Motor |
Io Value |
0.47 A |
0.53 A |
0.58 A |
0.63 A |
490 RPM/Volt @ 15V |
0.111 Ohms |
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Prop |
Prop |
Li-Po |
Input |
Motor |
Input |
Prop |
Pitch Speed |
Thrust |
Thrust |
Thrust Eff. |
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Manf. |
Size |
Cells |
Voltage |
Amps |
Watts |
RPM |
in MPH |
Grams |
Ounces |
Grams/W |
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APC |
12x4.5-MR |
4 |
14.8 |
9.41 |
139.3 |
6,351 |
27.1 |
1111 |
39.19 |
7.98 |
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APC |
14x5.5-MR |
4 |
14.8 |
15.34 |
227.0 |
5,827 |
30.3 |
1641 |
57.88 |
7.23 |
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APC |
16x5.5-MR |
4 |
14.8 |
21.30 |
315.2 |
5,277 |
27.5 |
2141 |
75.52 |
6.79 |
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APC |
18x5.5-MR |
4 |
14.8 |
25.96 |
384.2 |
4,767 |
24.8 |
2453 |
86.53 |
6.38 |
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GemFan |
14x4.5-MR-W |
4 |
14.8 |
13.02 |
192.7 |
6,025 |
25.7 |
1454 |
51.29 |
7.55 |
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GemFan |
15x4.5-MR-W |
4 |
14.8 |
14.08 |
208.4 |
5,919 |
25.2 |
1545 |
54.50 |
7.41 |
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GemFan |
16x4.5-MR-W |
4 |
14.8 |
18.53 |
274.2 |
5,533 |
23.6 |
1918 |
67.65 |
6.99 |
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RC-Timer |
12x5.5-CF |
4 |
14.8 |
11.44 |
169.3 |
6,189 |
32.2 |
1143 |
40.32 |
6.75 |
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RC-Timer |
13x5.5-CF |
4 |
14.8 |
14.97 |
221.6 |
5,850 |
30.5 |
1412 |
49.81 |
6.37 |
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RC-Timer |
14x5.5-CF |
4 |
14.8 |
19.53 |
289.0 |
5,392 |
28.1 |
1633 |
57.60 |
5.65 |
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RC-Timer |
15x5.5-CF |
4 |
14.8 |
25.05 |
370.7 |
4,891 |
25.5 |
1889 |
66.63 |
5.10 |
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RC-Timer |
16x5.5-CF |
4 |
14.8 |
27.77 |
411.0 |
4,588 |
23.9 |
2041 |
71.99 |
4.97 |
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Prop |
Prop |
Li-Po |
Input |
Motor |
Input |
Prop |
Pitch Speed |
Thrust |
Thrust |
Thrust Eff. |
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Manf. |
Size |
Cells |
Voltage |
Amps |
Watts |
RPM |
in MPH |
Grams |
Ounces |
Grams/W |
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APC |
11x4.5-MR |
5 |
18.5 |
10.68 |
197.6 |
7,963 |
33.9 |
1316 |
46.42 |
6.66 |
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APC |
12x4.5-MR |
5 |
18.5 |
13.88 |
256.8 |
7,650 |
32.6 |
1651 |
58.24 |
6.43 |
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APC |
14x5.5-MR |
5 |
18.5 |
21.81 |
403.5 |
6,893 |
35.9 |
2366 |
83.46 |
5.86 |
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APC |
16x5.5-MR |
5 |
18.5 |
28.89 |
534.5 |
6,080 |
31.7 |
2850 |
100.53 |
5.33 |
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GemFan |
12x4-MR-W |
5 |
18.5 |
12.53 |
231.8 |
7,780 |
29.5 |
1516 |
53.47 |
6.54 |
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GemFan |
13x4.5-MR-W |
5 |
18.5 |
15.60 |
288.6 |
7,480 |
31.9 |
1812 |
63.92 |
6.28 |
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GemFan |
14x4.5-MR-W |
5 |
18.5 |
18.16 |
336.0 |
7,208 |
30.7 |
2070 |
73.02 |
6.16 |
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GemFan |
15x4.5-MR-W |
5 |
18.5 |
19.99 |
369.8 |
7,048 |
30.0 |
2251 |
79.40 |
6.09 |
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GemFan |
16x4.5-MR-W |
5 |
18.5 |
25.48 |
471.4 |
6,476 |
27.6 |
2656 |
93.69 |
5.63 |
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RC-Timer |
11x5.5-CF |
5 |
18.5 |
10.85 |
200.7 |
7,949 |
41.4 |
1211 |
42.72 |
6.03 |
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RC-Timer |
12x5.5-CF |
5 |
18.5 |
16.84 |
311.5 |
7,364 |
38.4 |
1682 |
59.33 |
5.40 |
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RC-Timer |
13x5.5-CF |
5 |
18.5 |
21.84 |
404.0 |
6,872 |
35.8 |
2031 |
71.64 |
5.03 |
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RC-Timer |
14x5.5-CF |
5 |
18.5 |
27.42 |
507.3 |
6,235 |
32.5 |
2234 |
78.80 |
4.40 |
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Prop |
Prop |
Li-Po |
Input |
Motor |
Input |
Prop |
Pitch Speed |
Thrust |
Thrust |
Thrust Eff. |
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Manf. |
Size |
Cells |
Voltage |
Amps |
Watts |
RPM |
in MPH |
Grams |
Ounces |
Grams/W |
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APC |
10x4.5-MR |
6 |
22.2 |
11.66 |
258.9 |
9,571 |
40.8 |
1461 |
51.53 |
5.64 |
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APC |
11x4.5-MR |
6 |
22.2 |
14.72 |
326.8 |
9,247 |
39.4 |
1825 |
64.37 |
5.58 |
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APC |
12x4.5-MR |
6 |
22.2 |
18.80 |
417.4 |
8,834 |
37.6 |
2242 |
79.08 |
5.37 |
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APC |
14x5.5-MR |
6 |
22.2 |
28.46 |
631.8 |
7,794 |
40.6 |
3045 |
107.41 |
4.82 |
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GemFan |
11x4-MR-W |
6 |
22.2 |
12.62 |
280.2 |
9,473 |
35.9 |
1640 |
57.85 |
5.85 |
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GemFan |
12x4-MR-W |
6 |
22.2 |
16.68 |
370.3 |
9,049 |
34.3 |
2072 |
73.09 |
5.60 |
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GemFan |
13x4.5-MR-W |
6 |
22.2 |
20.61 |
457.5 |
8,631 |
36.8 |
2427 |
85.61 |
5.30 |
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GemFan |
14x4.5-MR-W |
6 |
22.2 |
24.03 |
533.5 |
8,255 |
35.2 |
2775 |
97.88 |
5.20 |
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GemFan |
15x4.5-MR-W |
6 |
22.2 |
26.35 |
585.0 |
7,994 |
34.1 |
2984 |
105.26 |
5.10 |
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GemFan |
16x4.5-MR-W |
6 |
22.2 |
32.05 |
711.5 |
7,235 |
30.8 |
3332 |
117.53 |
4.68 |
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RC-Timer |
10x5.5-CF |
6 |
22.2 |
9.88 |
219.3 |
9,773 |
50.9 |
1253 |
44.20 |
5.71 |
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RC-Timer |
11x5.5-CF |
6 |
22.2 |
14.98 |
332.6 |
9,220 |
48.0 |
1684 |
59.40 |
5.06 |
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RC-Timer |
12x5.5-CF |
6 |
22.2 |
22.83 |
506.8 |
8,408 |
43.8 |
2258 |
79.65 |
4.46 |
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RC-Timer |
13x5.5-CF |
6 |
22.2 |
28.79 |
639.1 |
7,703 |
40.1 |
2594 |
91.50 |
4.06 |
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Propeller Chart Color Code Explanation |
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The prop is
to small to get good performance from the motor. (Less than 50% power) |
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The prop is
sized right to get good power from the motor. (50 to 80% power) |
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The prop can
be used, but full throttle should be kept to short bursts. (80 to 100% power) |
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The prop is
too big for the motor and should not be used. (Over 100% power) |
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PLEASE NOTE: |
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The Data contained in this Prop Chart is based on
actual measurements, taken in a controlled test environment, at an altitude
of |
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512 feet above sea level. The test voltages used are based on the
standard output of a Li-Po battery under load, which is 3.70 volts |
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per cell.
If you are using a battery that is larger in capacity than normal, or
has a very high C-rating, then your actual voltages will |
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be higher than those shown in the chart, and this
will result in a higher current and power value for every prop used. You should |
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always
test your actual power system with a watt meter before flying your model to
make sure that you are not exceeding the |
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recommended current and power ratings of the motor
being used. The prop recommendations
in this chart assume that the motor |
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receives adequate cooling throughout its
operation. If your motor is being used
inside a cowl or fuselage, you must ensure that |
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the motor receives sufficient airflow, and does
not get too hot during operation. It
is always best to use a prop size that pulls no |
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more than 80% of the motors maximum recommended
current value to ensure safe operation under all conditions. |
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