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Cobra
CM-4008/24 600Kv Motor Propeller Data |
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Magnets |
Motor Wind |
Motor Kv |
No-Load Current |
Motor Resistance |
I Max |
P Max (4S) |
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22-Pole |
24-Turn Wye |
600 RPM/Volt |
Io = 0.72 Amps @ 12v |
Rm = 0.086 Ohms |
23 Amps |
340 W |
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Stator |
Outside Diameter |
Body Length |
Total Shaft Length |
Shaft Diameter |
Motor Weight |
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24-Slot |
45.5 mm, 1.791 in. |
23.9 mm, 0.941 in. |
33.5 mm, 1.319 in. |
4.00 mm, 0.157 in. |
106 gm, 3.74 oz |
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Test Data
From |
Input |
10.0 V |
12.0 V |
14.0V |
16.0V |
Measured Kv value |
Measured Rm Value |
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Sample Motor |
Io Value |
0.65 A |
0.72 A |
.79 A |
.87 A |
597 RPM/Volt @ 12V |
0.086 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 |
3 |
11.1 |
9.38 |
104.1 |
5,737 |
29.9 |
880 |
31.04 |
8.45 |
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APC |
13x5.5-MR |
3 |
11.1 |
12.36 |
137.2 |
5,423 |
28.2 |
1103 |
38.91 |
8.04 |
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APC |
14x5.5-MR |
3 |
11.1 |
15.11 |
167.7 |
5,231 |
27.2 |
1306 |
46.07 |
7.79 |
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APC |
16x5.5-MR |
3 |
11.1 |
21.17 |
235.0 |
4,705 |
24.5 |
1673 |
59.01 |
7.12 |
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GemFan |
13x4.5-MR-W |
3 |
11.1 |
10.99 |
122.0 |
5,597 |
23.9 |
981 |
34.60 |
8.04 |
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GemFan |
14x4.5-MR-W |
3 |
11.1 |
12.90 |
143.2 |
5,424 |
23.1 |
1155 |
40.74 |
8.07 |
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GemFan |
15x4.5-MR-W |
3 |
11.1 |
13.98 |
155.2 |
5,325 |
22.7 |
1213 |
42.79 |
7.82 |
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GemFan |
16x4.5-MR-W |
3 |
11.1 |
18.31 |
203.2 |
4,939 |
21.0 |
1494 |
52.70 |
7.35 |
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RC-Timer |
12x5.5-CF |
3 |
11.1 |
11.14 |
123.7 |
5,571 |
29.0 |
903 |
31.85 |
7.30 |
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RC-Timer |
13x5.5-CF |
3 |
11.1 |
14.33 |
159.1 |
5,285 |
27.5 |
1100 |
38.80 |
6.92 |
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RC-Timer |
14x5.5-CF |
3 |
11.1 |
19.16 |
212.7 |
4,879 |
25.4 |
1302 |
45.93 |
6.12 |
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RC-Timer |
15x5.5-CF |
3 |
11.1 |
24.44 |
271.3 |
4,412 |
23.0 |
1475 |
52.03 |
5.44 |
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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 |
4 |
14.8 |
9.24 |
136.8 |
7,809 |
33.3 |
919 |
32.42 |
6.72 |
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APC |
11x4.5-MR |
4 |
14.8 |
11.65 |
172.4 |
7,566 |
32.2 |
1167 |
41.16 |
6.77 |
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APC |
12x4.5-MR |
4 |
14.8 |
14.97 |
221.6 |
7,267 |
31.0 |
1433 |
50.55 |
6.47 |
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APC |
13x5.5-MR |
4 |
14.8 |
19.77 |
292.6 |
6,743 |
35.1 |
1787 |
63.03 |
6.11 |
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APC |
14x5.5-MR |
4 |
14.8 |
23.53 |
348.2 |
6,420 |
33.4 |
2009 |
70.86 |
5.77 |
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GemFan |
11x4-MR-W |
4 |
14.8 |
10.32 |
152.7 |
7,715 |
29.2 |
1055 |
37.21 |
6.91 |
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GemFan |
12x4-MR-W |
4 |
14.8 |
13.73 |
203.2 |
7,361 |
27.9 |
1341 |
47.30 |
6.60 |
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GemFan |
13x4.5-MR-W |
4 |
14.8 |
17.08 |
252.8 |
7,049 |
30.0 |
1601 |
56.47 |
6.33 |
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GemFan |
14x4.5-MR-W |
4 |
14.8 |
20.02 |
296.3 |
6,776 |
28.9 |
1844 |
65.04 |
6.22 |
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GemFan |
15x4.5-MR-W |
4 |
14.8 |
21.72 |
321.5 |
6,585 |
28.1 |
1899 |
66.98 |
5.91 |
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GemFan |
16x4.5-MR-W |
4 |
14.8 |
27.89 |
412.8 |
5,987 |
25.5 |
2208 |
77.88 |
5.35 |
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RC-Timer |
10x5.5-CF |
4 |
14.8 |
7.94 |
117.5 |
7,956 |
41.4 |
781 |
27.55 |
6.65 |
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RC-Timer |
11x5.5-CF |
4 |
14.8 |
11.89 |
176.0 |
7,556 |
39.4 |
1079 |
38.06 |
6.13 |
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RC-Timer |
12x5.5-CF |
4 |
14.8 |
18.09 |
267.7 |
6,948 |
36.2 |
1472 |
51.92 |
5.50 |
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RC-Timer |
13x5.5-CF |
4 |
14.8 |
23.55 |
348.5 |
6,481 |
33.8 |
1744 |
61.52 |
5.00 |
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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
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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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