Cobra CP2814-1800 Motor Propeller Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 8-Turn Delta 1800 RPM/Volt Io = 3.01 Amps @ 10v Rm = 0.013 Ohms 75 Amps 1110 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 35.1 mm, 1.38 in. 36.0 mm, 1.42 in. 41.5 mm, 1.63 in. 5.00 mm, 0.197 in. 120 gm, 4.23 oz
 
Test Data From Input 8.0 V 10.0 V 12.0V 14.0V Measured Kv value Measured Rm Value
Sample Motor Io Value 2.491 A 3.099 A 3.311 A 3.737 A 1786 RPM/Volt @ 10V 0.0133 Ohms
Prop Prop Li-Po Input Motor Watts Prop Pitch Thrust Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 6x6-E 3 11.1 27.07 300.4 17,952 102.0 796 28.08 2.65
APC 7x4-E 3 11.1 33.89 376.2 17,497 66.3 1356 47.83 3.60
APC 7x5-E 3 11.1 41.94 465.5 16,913 80.1 1336 47.13 2.87
APC 7x6-E 3 11.1 44.40 492.9 16,800 95.5 1430 50.44 2.90
APC 8x4-E 3 11.1 50.65 562.2 16,384 62.1 1752 61.80 3.12
APC 8x6-E 3 11.1 76.54 849.6 14,755 83.8 1877 66.21 2.21
HQ 7x4.5 3 11.1 35.71 396.3 17,382 74.1 1377 48.57 3.47
HQ 8x5 3 11.1 49.05 544.4 16,502 78.1 1647.8 58.12 3.03
 
Prop Prop Li-Po Input Motor Watts Prop Pitch Thrust Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 5x4.6-MR 4 14.8 28.93 428.2 24,355 106.1 1087 38.34 2.54
APC 6x4-E 4 14.8 33.44 495.0 24,000 90.9 1232 43.46 2.49
APC 6x4.3-MR 4 14.8 45.59 674.8 23,123 94.2 1748 61.66 2.59
APC 6x4.5-MR 4 14.8 42.31 626.2 23,373 99.6 1739 61.34 2.78
APC 6x5.5-E 4 14.8 40.43 598.3 23,479 122.3 1293 45.61 2.16
APC 6x6-E 4 14.8 46.37 686.2 23,045 130.9 1305 46.03 1.90
APC 7x4-E 4 14.8 59.71 883.7 21,842 82.7 2159 76.16 2.44
APC 7x5-E 4 14.8 71.47 1057.8 20,983 99.4 2067 72.91 1.95
APC 7x6-E 4 14.8 73.61 1089.4 20,848 118.5 2170 76.54 1.99
HQ 6x4.5 4 14.8 32.79 485.3 24,063 102.5 1506 53.12 3.10
HQ 6x4.5-BN 4 14.8 46.91 694.3 23,046 98.2 1781 62.82 2.57
HQ 7x4.5 4 14.8 57.84 856.0 21,998 93.7 2191 77.28 2.56
2017 Innov8tive Designs, Inc.
This chart, and the data contained within it, are the property of Innov8tive Designs, Inc., and may not be reproduced without permission from the author.
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
584 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.