Cobra CM-2205-2300 Champion Motor Propeller Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 28-Turn Delta 2300 RPM/Volt Io = 1.13 Amps @ 10v Rm = 0.056 Ohms 22 Amps 325 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 27.9 mm,  1.098 in. 16.1 mm,  0.634 in. 33.6 mm,  1.323 in. 3.00 mm,  0.118 in. 29.8 gm,   1.05 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 0.874 A 0.995 A 1.131 A 1.268 A 2284 RPM/Volt @ 10v 0.0564 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 4x3.3-FPV 3 11.1 9.27 102.9 22,993 71.9 353.9 12.48 3.44
APC 4x4.5-FPV 3 11.1 12.44 138.1 22,178 94.5 381.2 13.45 2.76
APC 4x4x3-FPV 3 11.1 12.83 142.4 21,984 83.3 464.4 16.38 3.26
APC 5x4x3-FPV 3 11.1 23.73 263.4 19,155 72.6 803.1 28.33 3.05
APC 5x4.3-FPV 3 11.1 21.01 233.2 20,007 81.5 695.1 24.52 2.98
APC 5x4.5-FPV 3 11.1 21.56 239.3 19,858 84.6 675.8 23.84 2.82
APC 5x4.6-FPV 3 11.1 21.92 243.3 19,740 86.0 718.4 25.34 2.95
HQ 4x4 3 11.1 9.75 108.2 22,863 86.6 372.1 13.13 3.44
HQ 4x4x3 3 11.1 12.26 136.1 22,139 83.9 457.9 16.15 3.36
HQ 4x4.5 3 11.1 6.54 72.6 23,741 101.2 253.5 8.94 3.49
HQ 4x4.5-BN 3 11.1 13.08 145.2 21,922 93.4 453.2 15.99 3.12
HQ 5x3 3 11.1 8.41 93.3 23,105 65.6 419.7 14.80 4.50
HQ 5x4 3 11.1 12.52 139.0 22,155 83.9 559.7 19.74 4.03
HQ 5x4x3 3 11.1 17.16 190.5 20,917 79.2 694.6 24.50 3.65
HQ 5x4.5 3 11.1 13.34 148.0 21,862 93.2 563.6 19.88 3.81
HQ 5x4.5-BN 3 11.1 20.79 230.8 19,940 85.0 732.4 25.83 3.17
HQ 6x3 3 11.1 12.76 141.6 22,015 62.5 627.2 22.12 4.43
 
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 4x3.3-FPV 4 14.8 15.13 223.9 29,415 91.9 591.8 20.87 2.64
APC 4x4.5-FPV 4 14.8 20.46 302.8 27,931 119.0 623.9 22.01 2.06
APC 4x4x3-FPV 4 14.8 20.36 301.4 27,870 105.6 759.5 26.79 2.52
HQ 4x4 4 14.8 14.27 211.1 29,583 112.1 597.0 21.06 2.83
HQ 4x4x3 4 14.8 17.69 261.7 27,954 105.9 697.9 24.62 2.67
HQ 4x4.5 4 14.8 10.57 156.4 30,737 131.0 428.1 15.10 2.74
HQ 4x4.5-BN 4 14.8 20.13 297.9 27,785 118.4 725.4 25.59 2.44
HQ 5x3 4 14.8 13.20 195.4 29,831 84.7 693.0 24.44 3.55
HQ 5x4 4 14.8 19.57 289.7 28,039 106.2 900.7 31.77 3.11
HQ 5x4.5 4 14.8 19.52 289.0 26,656 113.6 865.7 30.54 3.00
HQ 6x3 4 14.8 20.60 304.8 27,668 78.6 1027.8 36.25 3.37
 
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 4x3.3-FPV 5 18.5 22.45 415.3 34,924 109.1 854.9 30.16 2.06
HQ 4x4 5 18.5 18.67 345.4 35,835 135.7 855.1 30.16 2.48
HQ 4x4x3 5 18.5 21.84 404.0 33,383 126.5 956.5 33.74 2.37
HQ 4x4.5 5 18.5 14.92 276.0 37,170 158.4 635.4 22.41 2.30
HQ 5x3 5 18.5 17.24 318.9 34,937 99.3 962.1 33.94 3.02
HQ 5x4 5 18.5 25.19 466.1 32,417 122.8 1211.3 42.73 2.60
 
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
HQ 4x4 6 22.2 21.87 485.6 40,528 153.5 1066.8 37.63 2.20
HQ 4x4.5 6 22.2 19.77 439.0 43,038 183.4 849.0 29.95 1.93
HQ 5x3 6 22.2 22.83 506.7 40,207 114.2 1275.3 44.98 2.52
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.