Cobra C2808/22 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
22-Turn Delta 1330 RPM/Volt Io = 0.82 Amps @ 10v Rm = 0.056 Ohms 24 Amps 260 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
35.0 mm,  1.38 in. 28.1 mm,  1.11 in. 48.0 mm,  1.89 in. 5.00 mm,  0.197 in. 80.5 gm,   2.85 oz
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 7x4-E 11.1 10.55 117.1 12,430 47.1 630 22.22 5.38
APC 7x5-E 11.1 13.53 150.1 11,968 56.7 651 22.96 4.34
APC 7x6-E 11.1 14.13 156.9 11,866 67.4 700 24.69 4.46
APC 8x4-E 11.1 15.68 174.1 11,624 44.0 873 30.79 5.02
APC 8x6-E 11.1 22.36 248.2 10,602 60.2 984 34.71 3.96
APC 8x8-E 11.1 27.85 309.1 9,748 73.8 849 29.95 2.75
APC 9x4.5-E 11.1 21.40 237.6 10,782 45.9 1184 41.76 4.98
APC 9x6-E 11.1 24.02 266.6 10,332 58.7 1145 40.39 4.29
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 6x4-E 14.8 10.29 152.2 16,918 64.1 626 22.08 4.11
APC 6x5.5-E 14.8 12.97 191.9 16,430 85.6 653 23.03 3.40
APC 7x4-E 14.8 17.39 257.4 15,659 59.3 1055 37.21 4.10
APC 7x5-E 14.8 21.65 320.4 14,926 70.7 1044 36.83 3.26
APC 7x6-E 14.8 22.67 335.5 14,774 83.9 1117 39.40 3.33
APC 8x4-E 14.8 25.03 370.4 14,339 54.3 1368 48.25 3.69
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.  The test voltages used are based on a properly sized Li-Po battery for the current
draw of the motor being tested.  If you are using a larger than normal capacity battery, or a very
high C-Rated battery, your actual voltages will be higher than those shown in this chart, and this
will result in higer current draw for each prop used.  You should always test your power system
with a watt meter whenever a prop is used to ensure that you are not exceeding the recommended
rating of the motor being used.  The prop recommendations in this chart are based on the motor
receiving adequate cooling throughout its operation.  If your motor is being used inside a cowl, you
must provide adequate cooling to the motor and make sure that the motor is not getting too hot
during operation.