Cobra CP2814-2000 Motor Propeller Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 7-Turn Delta 2000 RPM/Volt Io = 3.29 Amps @ 10v Rm = 0.012 Ohms 80 Amps 1180 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 2.814 A 3.294 A 3.745 A 4.263 A 2058 RPM/Volt @ 10V 0.0117 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 6x4-E 3 11.1 28.02 311.0 20,952 79.4 925 32.63 2.97
APC 6x4.3-MR 3 11.1 38.71 429.7 20,273 82.6 1292 45.57 3.01
APC 6x4.5-MR 3 11.1 36.63 406.5 20,404 86.9 1283 45.26 3.16
APC 6x5.5-E 3 11.1 34.57 383.7 20,528 106.9 992 34.99 2.59
APC 6x6-E 3 11.1 40.18 446.0 20,185 114.7 1008 35.56 2.26
APC 7x4-E 3 11.1 52.39 581.5 19,414 73.5 1704 60.11 2.93
APC 7x5-E 3 11.1 64.10 711.5 18,583 88.0 1628 57.43 2.29
APC 7x6-E 3 11.1 64.79 719.2 18,619 105.8 1718 60.60 2.39
APC 8x4-E 3 11.1 75.74 840.7 17,950 68.0 2119 74.74 2.52
HQ 6x4.5 3 11.1 28.14 312.3 20,980 89.4 1106 39.01 3.54
HQ 6x4.5-BN 3 11.1 41.64 462.2 20,077 85.6 1346 47.48 2.91
HQ 7x4.5 3 11.1 51.72 574.0 19,452 82.9 1731 61.06 3.02
 
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 6x4-E 4 14.8 49.75 736.2 27,050 102.5 1503 53.02 2.04
APC 6x4.3-MR 4 14.8 66.57 985.2 25,750 104.9 2137 75.38 2.17
APC 6x4.5-MR 4 14.8 61.26 906.6 26,177 111.5 2146 75.70 2.37
APC 6x5.5-E 4 14.8 59.38 878.8 26,263 136.8 1566 55.24 1.78
APC 6x6-E 4 14.8 67.37 997.1 25,717 146.1 1573 55.49 1.58
APC 7x4-E 4 14.8 90.83 1344.3 23,889 90.5 2568 90.58 1.91
HQ 6x4.5 4 14.8 47.35 700.8 27,179 115.8 1886 66.53 2.69
HQ 6x4.5-BN 4 14.8 65.94 975.9 25,839 110.1 2170 76.54 2.22
HQ 7x4.5 4 14.8 83.46 1235.2 24,476 104.3 2653 93.58 2.15
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.