Cobra CP2814-1450 Motor Propeller Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (5S)
14-Pole 10-Turn Delta 1450 RPM/Volt Io = 4.08 Amps @ 15v Rm = 0.016 Ohms 55 Amps 1020 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 12.0 V 15.0 V 18.0V 21.0V Measured Kv value Measured Rm Value
Sample Motor Io Value 3.521 A 4.082 A 4.294 A 4.630 A 1580 RPM/Volt @ 15V 0.0163 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 7x4-E 3 11.1 24.80 275.2 15,690 59.4 1077 37.99 3.91
APC 7x5-E 3 11.1 31.10 345.2 15,316 72.5 1092 38.52 3.16
APC 7x6-E 3 11.1 33.04 366.8 15,275 86.8 1173 41.38 3.20
APC 8x4-E 3 11.1 38.09 422.8 15,004 56.8 1486 52.42 3.51
APC 8x6-E 3 11.1 59.93 665.3 13,707 77.9 1654 58.34 2.49
 
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 23.19 343.3 21,327 80.8 967 34.11 2.82
APC 6x4.3-MR 4 14.8 32.30 478.0 20,756 84.5 1407 49.63 2.94
APC 6x4.5-MR 4 14.8 30.23 447.4 20,885 89.0 1390 49.03 3.11
APC 6x5.5-E 4 14.8 28.88 427.4 20,973 109.2 1051 37.07 2.46
APC 6x6-E 4 14.8 33.49 495.6 20,667 117.4 1073 37.85 2.17
APC 7x4-E 4 14.8 44.04 651.7 19,932 75.5 1776 62.65 2.72
APC 7x5-E 4 14.8 53.96 798.6 19,345 91.6 1766 62.29 2.21
APC 7x6-E 4 14.8 56.67 838.7 19,260 109.4 1888 66.60 2.25
 
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 5 18.5 38.24 707.4 26,353 99.8 1478 52.13 2.09
APC 6x4.3-MR 5 18.5 52.19 965.5 25,513 103.9 2153 75.94 2.23
APC 6x4.5-MR 5 18.5 47.42 877.3 25,837 110.1 2145 75.66 2.44
APC 6x5.5-E 5 18.5 46.54 861.0 25,858 134.7 1568 55.31 1.82
APC 6x6-E 5 18.5 52.55 972.1 25,418 144.4 1579 55.70 1.62
2018 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.