Cobra CM-2204/32 Motor Propeller Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
14-Pole 32-Turn Delta 1960 RPM/Volt Io = 0.55 Amps @ 10v Rm = 0.119 Ohms 13 Amps 140 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 27.0 mm,  1.063 in. 14.2 mm,  0.559 in. 32.5 mm,  1.146 in. 3.00 mm,  0.118 in. 24.6 gm,   0.87 oz
 
Test Data From Input 6.0 V 8.0 V 10.0V 12.0V Measured Kv value Measured Rm Value
Sample Motor Io Value 0.45 A 0.50 A 0.55 A 0.60 A 1972 RPM/Volt @ 10v 0.119 Ohms
 
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 5.25x4.75-E 3 11.1 9.77 108.4 16,856 75.8 354 12.49 3.26
APC 5.5x4.5-E 3 11.1 11.48 127.4 16,236 69.2 390 13.76 3.06
APC 6x4-E 3 11.1 12.32 136.8 15,797 59.8 534 18.84 3.90
FC 5x4.5 3 11.1 7.47 82.9 18,114 77.2 380 13.40 4.58
FC 5x4.5x3 3 11.1 10.50 116.6 16,654 71.0 462 16.30 3.96
FC 6x4.5 3 11.1 12.92 143.4 15,479 66.0 612 21.59 4.27
GemFan 5x3 3 11.1 5.76 63.9 18,949 53.8 346 12.20 5.41
GemFan 5x3x3 3 11.1 6.42 71.3 18,608 52.9 355 12.52 4.98
GemFan 6x3 3 11.1 8.33 92.5 17,693 50.3 478 16.86 5.17
HQ 4x4.5-BN 3 11.1 6.25 69.4 17,144 73.1 272 9.59 3.92
HQ 5x3 3 11.1 3.65 40.5 18,332 52.1 233 8.22 5.75
HQ 5x4 3 11.1 6.04 67.0 17,184 65.1 331 11.68 4.94
HQ 5x4x3 3 11.1 7.99 88.7 16,451 62.3 414 14.60 4.67
HQ 5x4.5-BN 3 11.1 9.44 104.8 15,821 67.4 426 15.03 4.07
HQ 6x3 3 11.1 6.15 68.3 17,178 48.8 375 13.23 5.49
HQ 6x4.5 3 11.1 11.36 126.1 14,979 63.8 559 19.72 4.43
HQ 6x4.5-BN 3 11.1 14.95 165.9 13,220 56.3 592 20.88 3.57
HQ 6x4.5x3 3 11.1 14.07 156.2 13,636 58.1 615 21.69 3.94
 
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 5.25x4.75-E 4 14.8 14.54 215.2 19,048 85.7 512 18.06 2.38
FC 5x4.5 4 14.8 9.36 138.5 21,341 90.9 523 18.45 3.78
HQ 4x4.5-BN 4 14.8 9.06 134.1 21,455 91.4 428 15.10 3.19
HQ 5x3 4 14.8 5.28 78.1 23,077 65.6 370 13.05 4.73
HQ 5x4 4 14.8 8.78 129.9 21,564 81.7 524 18.48 4.03
HQ 5x4x3 4 14.8 11.68 172.9 20,443 77.4 645 22.75 3.73
HQ 5x4.5-BN 4 14.8 13.72 203.1 19,239 82.0 650 22.93 3.20
HQ 6x3 4 14.8 9.26 137.0 21,295 60.5 603 21.27 4.40
Propeller Chart Color Code Explanation
   The prop is to small to get good performance from the motor. (Less than 50% power)
   The prop is sized right to get good power from the motor. (50 to 80% power)
   The prop can be used, but full throttle should be kept to short bursts. (80 to 100% power)
   The prop is too big for the motor and should not be used. (Over 100% power)
PLEASE NOTE:
The Data contained in this Prop Chart is based on actual measurements, taken in a controlled test environment, at an altitude of
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
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
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
always test your actual power system with a watt meter before flying your model to make sure that you are not exceeding the 
recommended current and power ratings of the motor being used.  The prop recommendations in this chart assume that the motor
receives adequate cooling throughout its operation.  If your motor is being used inside a cowl or fuselage, you must ensure that
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
more than 80% of the motors maximum recommended current value to ensure safe operation under all conditions.