Cobra C2826/8 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
8-Turn Delta 1130 RPM/Volt Io = 2.30 Amps @ 10v Rm = 0.025 Ohms 55 Amps 610 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
35.0 mm,  1.38 in. 46.0 mm,  1.81 in. 66.0 mm,  2.60 in. 5.00 mm,  0.197 in. 171 gm,   6.03 oz
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x8-E 11.1 28.85 320.3 10,257 77.7 930 32.80 2.90
APC 9x6-E 11.1 23.31 258.7 10,577 60.1 1176 41.48 4.55
APC 9x7.5-E 11.1 35.58 394.9 9,857 70.0 1273 44.90 3.22
APC 9x9-E 11.1 39.50 438.5 9,578 81.6 1260 44.44 2.87
APC 10x5-E 11.1 28.75 319.1 10,256 48.6 1516 53.47 4.75
APC 10x6-E 11.1 30.51 338.7 10,098 57.4 1599 56.40 4.72
APC 10x7-E 11.1 35.52 394.3 9,860 65.4 1728 60.95 4.38
APC 10x10-E 11.1 49.55 550.0 9,041 85.6 1499 52.88 2.73
APC 11x5.5-E 11.1 38.48 427.2 9,636 50.2 2022 71.32 4.73
APC 11x7-E 11.1 45.11 500.7 9,314 61.7 2105 74.25 4.20
APC 11x8-E 11.1 47.89 531.5 9,076 68.8 1992 70.27 3.75
APC 11x8.5-E 11.1 51.62 573.0 8,929 71.9 2013 71.01 3.51
APC 12x6-E 11.1 48.68 540.4 9,035 51.3 2416 85.22 4.47
APC 12x8-E 11.1 58.63 650.8 8,504 64.4 2115 74.60 3.25
APC 13x4-E 11.1 38.78 430.4 9,678 36.7 2310 81.48 5.37
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x4-E 14.8 23.96 354.5 14,441 54.7 1409 49.70 3.97
APC 8x6-E 14.8 38.23 565.8 13,428 76.3 1618 57.07 2.86
APC 8x8-E 14.8 48.71 720.9 12,822 97.1 1471 51.89 2.04
APC 9x4.5-E 14.8 34.59 511.9 13,728 58.5 2056 72.52 4.02
APC 9x6-E 14.8 39.57 585.7 13,408 76.2 1947 68.68 3.32
APC 9x7.5-E 14.8 58.87 871.2 12,176 86.5 1964 69.28 2.25
APC 10x5-E 14.8 48.48 717.5 12,829 60.7 2373 83.70 3.31
APC 10x6-E 14.8 50.14 742.0 12,646 71.9 2517 88.78 3.39
APC 10x7-E 14.8 58.11 860.0 12,182 80.8 2574 90.79 2.99
 
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 18.5 24.31 449.8 18,237 69.1 1479 52.17 3.29
APC 7x5-E 18.5 30.73 568.5 17,757 84.1 1500 52.91 2.64
APC 7x6-E 18.5 31.57 584.1 17,615 100.1 1609 56.76 2.75
APC 8x4-E 18.5 37.02 684.9 17,305 65.5 2022 71.32 2.95
APC 8x6-E 18.5 59.05 1092.4 15,733 89.4 2201 77.64 2.01
APC 9x4.5-E 18.5 51.60 954.6 16,244 69.2 2985 105.29 3.13
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.