Cobra C4130/20 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (6S)
20-Turn Delta 300 RPM/Volt Io = 0.77 Amps @ 20v Rm = 0.046 Ohms 52 Amps 1150 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
49.8 mm,  1.96 in. 61.8 mm,  2.43 in. 84.5 mm,  3.33 in. 6.00 mm,  0.236 in. 396 gm,   13.97 oz
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 16x10-E 22.2 25.11 557.4 5,654 53.5 3113 109.81 5.58
APC 16x12-E 22.2 31.51 699.5 5,426 61.7 2631 92.80 3.76
APC 17x8-E 22.2 24.94 553.7 5,662 42.9 3399 119.89 6.14
APC 17x10-E 22.2 30.12 668.7 5,474 51.8 3493 123.21 5.22
APC 17x12-E 22.2 33.84 751.2 5,344 60.7 3424 120.78 4.56
APC 18x8-E 22.2 25.98 576.8 5,622 42.6 3772 133.05 6.54
APC 18x10-E 22.2 30.62 679.9 5,459 51.7 4001 141.13 5.89
APC 18x12-E 22.2 42.43 941.8 5,053 57.4 3785 133.51 4.02
APC 19x8-E 22.2 35.28 783.3 5,294 40.1 4556 160.71 5.82
APC 19x10-E 22.2 34.70 770.3 5,317 50.4 4576 161.41 5.94
APC 19x12-E 22.2 40.42 897.3 5,126 58.3 4866 171.64 5.42
APC 20x8-E 22.2 37.37 829.5 5,228 39.6 5046 177.99 6.08
APC 20x10-E 22.2 41.52 921.7 5,021 47.5 5227 184.38 5.67
APC 20x11-E 22.2 45.11 1001.5 4,973 51.8 5233 184.59 5.23
APC 20x13-E 22.2 46.25 1026.8 4,836 59.5 5294 186.74 5.16
APC 20x15-E 22.2 58.00 1287.5 4,533 64.4 4558 160.78 3.54
APC 21x12W-E 22.2 54.50 1210.0 4,679 53.2 6062 213.83 5.01
APC 21x14-E 22.2 51.27 1138.3 4,733 62.7 5887 207.66 5.17
APC 22x10-E 22.2 52.60 1167.7 4,703 44.5 6362 224.41 5.45
MAS 16x8x3 22.2 23.37 518.8 5,719 43.3 3256 114.85 6.28
MAS 16x10x3 22.2 29.07 645.2 5,415 51.3 3744 132.06 5.80
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 14x10-E 29.6 22.64 670.1 7,750 73.4 3201 112.91 4.78
APC 14x12-E 29.6 32.49 961.6 7,318 83.2 3024 106.67 3.14
APC 15x8-E 29.6 23.63 699.5 7,595 57.5 3726 131.43 5.33
APC 15x10-E 29.6 34.79 1029.7 7,131 67.5 3928 138.55 3.81
APC 16x8-E 29.6 38.61 1142.9 7,084 53.7 4633 163.42 4.05
APC 16x10-E 29.6 42.41 1255.2 6,939 65.7 4616 162.82 3.68
APC 16x12-E 29.6 48.86 1446.2 6,694 76.1 4007 141.34 2.77
APC 17x8-E 29.6 40.91 1210.9 6,994 53.0 5364 189.21 4.43
APC 17x10-E 29.6 47.94 1419.0 6,704 63.5 5524 194.85 3.89
APC 17x12-E 29.6 53.50 1583.6 6,549 74.4 5091 179.58 3.21
APC 18x8-E 29.6 40.74 1205.9 7,004 53.1 6021 212.38 4.99
APC 18x10-E 29.6 48.04 1422.1 6,768 64.1 6279 221.48 4.42
APC 19x8-E 29.6 56.51 1672.6 6,400 48.5 6860 241.98 4.10
MAS 13x8x3 29.6 21.22 628.1 7,808 59.2 3173 111.92 5.05
MAS 14x7x3 29.6 25.11 743.3 7,645 50.7 3790 133.69 5.10
MAS 14x9x3 29.6 29.21 864.7 7,366 62.8 4254 150.05 4.92
MAS 15x7x3 29.6 30.33 897.7 7,315 48.5 4534 159.93 5.05
MAS 16x8x3 29.6 35.91 1063.0 7,203 54.6 5212 183.85 4.90
MAS 16x10x3 29.6 45.68 1352.1 6,824 64.6 5976 210.80 4.42
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 12x8-E 37.0 23.03 852.3 9,758 73.9 2892 102.01 3.39
APC 12x10-E 37.0 28.64 1059.8 9,472 89.7 3080 108.64 2.91
APC 13x6.5-E 37.0 26.34 974.4 9,590 59.0 3922 138.34 4.03
APC 13x8-E 37.0 28.65 1060.0 9,477 71.8 3869 136.47 3.65
APC 13x10-E 37.0 38.52 1425.3 8,999 85.2 3671 129.49 2.58
APC 14x7-E 37.0 33.09 1224.3 9,134 60.5 4558 160.78 3.72
APC 14x8.5-E 37.0 35.10 1298.6 9,158 73.7 4591 161.94 3.54
APC 14x10-E 37.0 34.63 1281.3 9,211 87.2 4467 157.57 3.49
APC 14x12-E 37.0 49.73 1839.9 8,566 97.3 4068 143.49 2.21
APC 15x4-E 37.0 26.28 972.5 9,594 36.3 4832 170.44 4.97
APC 15x6-E 37.0 34.45 1274.5 9,063 51.5 5277 186.14 4.14
APC 15x8-E 37.0 36.37 1345.8 9,121 69.1 5233 184.59 3.89
APC 15x10-E 37.0 53.62 1984.0 8,389 79.4 5385 189.95 2.71
MAS 11x8x3 37.0 18.83 696.6 9,984 75.6 3016 106.39 4.33
MAS 12x6x3 37.0 18.77 694.6 9,867 56.1 3220 113.58 4.64
MAS 12x8x3 37.0 26.43 977.7 9,452 71.6 4112 145.05 4.21
MAS 13x8x3 37.0 30.37 1123.7 9,393 71.2 4707 166.03 4.19
MAS 14x7x3 37.0 35.59 1317.0 9,154 60.7 5498 193.93 4.17
MAS 14x9x3 37.0 42.48 1571.6 8,846 75.4 6124 216.02 3.90
MAS 15x7x3 37.0 44.20 1635.2 8,773 58.2 6612 233.23 4.04
MAS 16x8x3 29.6 50.75 1502.3 8,502 64.4 7422 261.80 4.94
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.