Cobra C2826/12 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
12-Turn Delta 760 RPM/Volt Io = 1.10 Amps @ 10v Rm = 0.045 Ohms 42 Amps 460 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 11x8.5-E 11.1 18.85 209.2 6,753 54.4 1168 41.20 5.58
APC 11x10-E 11.1 22.48 249.6 6,533 61.9 1062 37.46 4.26
APC 12x6-E 11.1 16.95 188.1 6,821 38.8 1295 45.68 6.88
APC 12x8-E 11.1 21.98 243.9 6,529 49.5 1239 43.70 5.08
APC 12x10-E 11.1 25.26 280.4 6,373 60.4 1392 49.10 4.96
APC 13x6.5-E 11.1 23.42 260.0 6,449 39.7 1628 57.43 6.26
APC 13x8-E 11.1 25.96 288.2 6,336 48.0 1686 59.47 5.85
APC 13x10-E 11.1 30.54 339.0 6,061 57.4 1650 58.20 4.87
APC 14x7-E 11.1 28.72 318.8 6,171 40.9 1926 67.94 6.04
APC 14x8.5-E 11.1 31.19 346.2 6,041 48.6 1969 69.45 5.69
APC 14x10-E 11.1 31.06 344.7 6,052 57.3 1955 68.96 5.67
APC 14x12-E 11.1 39.78 441.6 5,458 62.0 1698 59.89 3.85
APC 15x4-E 11.1 23.74 263.5 6,469 24.5 1896 66.88 7.20
APC 15x6-E 11.1 30.57 339.3 6,063 34.4 2161 76.23 6.37
APC 15x8-E 11.1 33.26 369.2 5,916 44.8 2213 78.06 5.99
APC 15x10-E 11.1 40.46 449.1 5,389 51.0 2180 76.90 4.85
APC 16x8-E 11.1 42.30 469.5 5,289 40.1 2498 88.11 5.32
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 9x7.5-E 14.8 19.48 288.4 9,152 65.0 1104 38.94 3.83
APC 9x9-E 14.8 23.17 342.9 8,959 76.4 1130 39.86 3.30
APC 10x7-E 14.8 20.13 297.9 9,153 60.7 1493 52.66 5.01
APC 10x10-E 14.8 29.14 431.3 8,563 81.1 1361 48.01 3.16
APC 11x5.5-E 14.8 22.12 327.3 9,028 47.0 1772 62.50 5.41
APC 11x7-E 14.8 26.01 385.0 8,764 58.1 1870 65.96 4.86
APC 11x8-E 14.8 28.06 415.3 8,639 65.4 1863 65.71 4.49
APC 11x8.5-E 14.8 30.46 450.8 8,476 68.2 1856 65.47 4.12
APC 11x10-E 14.8 35.12 519.8 8,141 77.1 1663 58.66 3.20
APC 12x6-E 14.8 28.36 419.7 8,572 48.7 2176 76.76 5.18
APC 12x8-E 14.8 34.88 516.2 8,132 61.6 1960 69.14 3.80
APC 12x10-E 14.8 40.16 594.4 7,727 73.2 2066 72.88 3.48
APC 13x4-E 14.8 22.31 330.2 8,970 34.0 2016 71.11 6.11
APC 13x6.5-E 14.8 38.07 563.4 7,967 49.0 2614 92.21 4.64
APC 13x8-E 14.8 40.58 600.6 7,763 58.8 2549 89.91 4.24
APC 13x10-E 14.8 47.24 699.2 7,265 68.8 2388 84.23 3.42
APC 14x7-E 14.8 44.29 655.5 7,438 49.3 2884 101.73 4.40
APC 15x4-E 14.8 38.11 564.1 7,954 30.1 3065 108.11 5.43
APC 15x6-E 14.8 46.62 690.0 7,279 41.4 3262 115.06 4.73
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x6-E 18.5 17.86 330.4 11,781 66.9 1227 43.28 3.71
APC 8x8-E 18.5 23.88 441.8 11,353 86.0 1166 41.13 2.64
APC 9x6-E 18.5 19.29 356.8 11,678 66.4 1484 52.35 4.16
APC 9x7.5-E 18.5 29.89 553.0 10,916 77.5 1603 56.54 2.90
APC 9x9-E 18.5 33.05 611.4 10,681 91.0 1605 56.61 2.63
APC 10x5-E 18.5 23.96 443.3 11,352 53.8 1899 66.98 4.28
APC 10x6-E 18.5 25.68 475.0 11,215 63.7 2043 72.06 4.30
APC 10x7-E 18.5 29.35 543.0 10,946 72.6 2182 76.97 4.02
APC 10x10-E 18.5 41.52 768.0 10,051 95.2 1885 66.49 2.45
APC 11x5.5-E 18.5 32.55 602.2 10,721 55.8 2575 90.83 4.28
APC 11x7-E 18.5 37.70 697.5 10,276 68.1 2678 94.46 3.84
APC 11x8-E 18.5 41.05 759.4 10,054 76.2 2506 88.40 3.30
APC 11x8.5-E 18.5 43.69 808.3 9,889 79.6 2516 88.75 3.11
APC 12x6-E 18.5 41.32 764.3 9,989 56.8 3093 109.10 4.05
APC 13x4-E 18.5 32.16 594.9 10,735 40.7 2968 104.69 4.99
 
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 22.2 16.06 356.6 14,547 55.1 1429 50.41 4.01
APC 8x6-E 22.2 26.72 593.2 13,670 77.7 1701 60.00 2.87
APC 8x8-E 22.2 33.80 750.3 13,081 99.1 1557 54.92 2.08
APC 9x4.5-E 22.2 23.66 525.3 13,915 59.3 2135 75.31 4.06
APC 9x6-E 22.2 27.29 605.9 13,630 77.4 2046 72.17 3.38
APC 9x7.5-E 22.2 40.91 908.1 12,494 88.7 2104 74.22 2.32
APC 9x9-E 22.2 44.63 990.8 12,176 103.8 2112 74.50 2.13
APC 10x5-E 22.2 33.89 752.3 13,094 62.0 2518 88.82 3.35
APC 10x6-E 22.2 35.29 783.4 12,900 73.3 2681 94.57 3.42
APC 10x7-E 22.2 41.03 911.0 12,495 82.8 2813 99.22 3.09
APC 11x5.5-E 22.2 45.00 999.0 12,148 63.3 3436 121.20 3.44
APC 13x4-E 22.2 43.04 955.4 12,248 46.4 3958 139.61 4.14
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.