Cobra C4130/16 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (6S)
16-Turn Delta 390 RPM/Volt Io = 1.12 Amps @ 20v Rm = 0.032 Ohms 55 Amps 1220 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 14x12-E 18.5 30.19 558.6 6,024 68.5 1981 69.88 3.55
APC 15x8-E 18.5 21.20 392.3 6,348 48.1 2519 88.85 6.42
APC 15x10-E 18.5 29.77 550.7 6,034 57.1 2852 100.60 5.18
APC 16x8-E 18.5 31.40 581.0 5,975 45.3 3278 115.63 5.64
APC 16x10-E 18.5 34.98 647.1 5,869 55.6 3403 120.04 5.26
APC 16x12-E 18.5 43.23 799.8 5,598 63.6 2818 99.40 3.52
APC 17x8-E 18.5 34.85 644.7 5,871 44.5 3690 130.16 5.72
APC 17x10-E 18.5 41.73 772.0 5,653 53.5 3764 132.77 4.88
APC 17x12-E 18.5 46.08 852.5 5,502 62.5 3610 127.34 4.23
APC 18x8-E 18.5 36.15 668.8 5,830 44.2 4154 146.53 6.21
APC 18x10-E 18.5 42.19 780.5 5,640 53.4 4386 154.71 5.62
APC 19x8-E 18.5 48.12 890.2 5,438 41.2 4879 172.10 5.48
APC 19x10-E 18.5 47.28 874.6 5,466 51.8 4905 173.02 5.61
APC 19x12-E 18.5 53.96 998.2 5,260 59.8 5054 178.27 5.06
APC 20x8-E 18.5 49.29 911.9 5,311 40.2 5284 186.39 5.79
MAS 14x7x3 18.5 22.64 418.9 6,290 41.7 2596 91.57 6.20
MAS 14x9x3 18.5 27.16 502.4 6,123 52.2 2957 104.30 5.89
MAS 15x7x3 18.5 27.31 505.3 6,035 40.0 3073 108.40 6.08
MAS 16x8x3 18.5 32.54 601.9 5,951 45.1 3598 126.91 5.98
MAS 16x10x3 18.5 41.12 760.8 5,670 53.7 4148 146.31 5.45
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 13x10-E 22.2 30.34 673.5 7,301 69.1 2394 84.44 3.55
APC 14x7-E 22.2 25.74 571.5 7,480 49.6 3002 105.89 5.25
APC 14x8.5-E 22.2 27.12 602.1 7,431 59.8 3118 109.98 5.18
APC 14x10-E 22.2 26.83 595.6 7,440 70.5 3027 106.77 5.08
APC 14x12-E 22.2 40.22 892.8 6,946 78.9 2625 92.59 2.94
APC 15x6-E 22.2 27.19 603.7 7,426 42.2 3451 121.73 5.72
APC 15x8-E 22.2 28.38 629.9 7,373 55.9 3381 119.26 5.37
APC 15x10-E 22.2 41.36 918.2 6,909 65.4 3682 129.88 4.01
APC 16x8-E 22.2 44.19 981.0 6,807 51.6 4298 151.61 4.38
APC 16x10-E 22.2 48.49 1076.5 6,668 63.1 4337 152.98 4.03
APC 16x12-E 22.2 57.00 1265.4 6,363 72.3 3669 129.42 2.90
APC 17x8-E 22.2 48.09 1067.6 6,689 50.7 4849 171.04 4.54
APC 17x10-E 22.2 54.37 1207.1 6,360 60.2 4800 169.31 3.98
APC 18x8-E 22.2 47.65 1057.7 6,699 50.8 5524 194.85 5.22
APC 18x10-E 22.2 55.34 1228.6 6,423 60.8 5644 199.08 4.59
MAS 13x8x3 22.2 25.54 567.0 7,494 56.8 2988 105.40 5.27
MAS 14x7x3 22.2 29.98 665.6 7,318 48.5 3572 126.00 5.37
MAS 14x9x3 22.2 35.73 793.2 7,104 60.5 3969 140.00 5.00
MAS 15x7x3 22.2 37.05 822.5 7,066 46.8 4268 150.55 5.19
MAS 16x8x3 22.2 41.23 915.2 6,806 51.6 4675 164.90 5.11
MAS 16x10x3 22.2 53.39 1185.3 6,490 61.5 5474 193.09 4.62
 
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 29.6 26.28 777.8 10,059 81.0 2628 92.70 3.38
APC 11x10-E 29.6 30.10 891.0 9,883 93.6 2448 86.35 2.75
APC 12x6-E 29.6 24.89 736.6 10,129 57.6 3269 115.31 4.44
APC 12x8-E 29.6 30.57 904.8 9,869 74.8 2950 104.06 3.26
APC 12x10-E 29.6 37.70 1115.9 9,551 90.4 3123 110.16 2.80
APC 12x12-E 29.6 40.26 1191.6 9,445 107.3 2973 104.87 2.49
APC 13x6.5-E 29.6 35.30 1045.0 9,655 59.4 3992 140.81 3.82
APC 13x8-E 29.6 37.73 1116.8 9,544 72.3 3958 139.61 3.54
APC 13x10-E 29.6 50.92 1507.4 8,999 85.2 3686 130.02 2.45
APC 14x7-E 29.6 44.99 1331.7 9,253 61.3 4681 165.12 3.51
APC 14x8.5-E 29.6 45.83 1356.5 9,224 74.2 4624 163.11 3.41
APC 14x10-E 29.6 45.56 1348.6 9,240 87.5 4518 159.37 3.35
APC 14x12-E 29.6 63.63 1883.6 8,519 96.8 3940 138.98 2.09
APC 15x4-E 29.6 34.80 1030.2 9,682 36.7 4914 173.33 4.77
APC 15x6-E 29.6 46.73 1383.1 9,193 52.2 5417 191.08 3.92
APC 15x8-E 29.6 47.84 1416.0 9,147 69.3 5246 185.05 3.70
MAS 11x8x3 29.6 24.68 730.6 10,144 76.8 3029 106.84 4.15
MAS 12x6x3 29.6 25.44 753.1 10,104 57.4 3397 119.82 4.51
MAS 12x8x3 29.6 34.98 1035.3 9,531 72.2 4207 148.40 4.06
MAS 13x8x3 29.6 39.76 1176.8 9,474 71.8 4797 169.21 4.08
MAS 14x7x3 29.6 46.61 1379.6 9,194 60.9 5678 200.28 4.12
MAS 14x9x3 29.6 54.85 1623.6 8,861 75.5 6211.8 219.11 3.83
MAS 15x7x3 29.6 57.02 1687.8 8,790 58.3 6690 235.98 3.96
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.