Cobra C2213/26 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
26-Turn Delta 950 RPM/Volt Io = 0.45 Amps @ 8v Rm = 0.134 Ohms 14 Amps 150 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
27.7 mm,  1.09 in. 28.0 mm,  1.10 in. 42.0 mm,  1.50 in. 3.17 mm,  0.125 in. 61.0 gm,   2.15 oz
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 9x6-E 7.4 5.29 39.1 5,690 32.3 336 11.85 8.58
APC 9x6-SF 7.4 11.14 82.4 5,700 32.4 506 17.85 6.14
APC 9x7.5-E 7.4 7.59 56.2 5,250 37.3 339 11.96 6.04
APC 10x3.8-SF 7.4 7.19 53.2 5,300 19.1 468 16.51 8.80
APC 10x4.7-SF 7.4 7.80 57.7 5,160 23.0 487 17.18 8.44
APC 10x5-E 7.4 6.16 45.6 5,530 26.2 413 14.57 9.06
APC 10x6-E 7.4 6.87 50.8 5,390 30.6 438 15.45 8.62
APC 10x7-E 7.4 7.82 57.9 5,180 34.3 444 15.66 7.67
APC 10x7-SF 7.4 10.07 74.5 4,700 31.2 514 18.13 6.90
APC 10x10-E 7.4 10.90 80.7 4,560 43.2 360 12.70 4.46
APC 11x3.8-SF 7.4 7.93 58.7 5,150 18.5 515 18.17 8.78
APC 11x4.7-SF 7.4 9.49 70.2 4,820 21.5 578 20.39 8.23
APC 11x5.5-E 7.4 8.04 59.5 5,160 26.9 523 18.45 8.79
APC 11x7-E 7.4 9.21 68.2 4,880 32.3 537 18.94 7.88
APC 11x7-SF 7.4 12.02 88.9 4,300 28.5 609 21.48 6.85
APC 11x8-E 7.4 10.20 75.5 4,680 35.5 476 16.79 6.31
APC 11x8.5-E 7.4 10.46 77.4 4,630 37.3 518 18.27 6.69
APC 11x10-E 7.4 12.34 91.3 4,260 40.3 417 14.71 4.57
APC 12x3.8-SF 7.4 10.57 78.2 4,590 16.5 627 22.12 8.02
APC 12x6-E 7.4 9.63 71.3 4,790 27.2 603 21.27 8.46
APC 12x6-SF 7.4 13.02 96.3 4,060 23.1 672 23.70 6.97
APC 12x8-E 7.4 11.66 86.3 4,370 33.1 543 19.15 6.29
APC 12x10-E 7.4 13.42 99.3 4,030 38.2 483 17.04 4.86
APC 13x4-E 7.4 8.80 65.1 4,950 18.8 585 20.64 8.98
APC 13x6.5-E 7.4 11.97 88.6 4,300 26.5 684 24.13 7.72
APC 13x8-E 7.4 12.86 95.2 4,130 31.3 682 24.06 7.17
GWS 10x4.7-SF 7.4 8.14 60.2 5,130 22.8 508 17.92 8.43
GWS 10x6-DD 7.4 6.05 44.8 5,540 31.5 418 14.74 9.34
GWS 10x6x3-DD 7.4 7.73 57.2 5,200 29.5 474 16.72 8.29
GWS 10x8-HD 7.4 9.13 67.6 4,890 27.8 428 15.10 6.33
GWS 10x8-SF 7.4 10.48 77.6 4,620 26.3 489 17.25 6.31
GWS 11x4.7-SF 7.4 9.43 69.8 4,830 21.5 573 20.21 8.21
GWS 11x7-DD 7.4 8.55 63.3 5,010 33.2 541 19.08 8.55
GWS 12x6-HD 7.4 9.16 67.8 4,880 27.7 585 20.64 8.63
GWS 12x8-DD 7.4 11.36 84.1 4,450 25.3 631 22.26 7.51
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 8x3.8-SF 11.1 6.80 75.5 8,470 30.5 518 18.27 6.86
APC 8x4-E 11.1 6.04 67.0 8,660 32.8 473 16.68 7.06
APC 8x6-E 11.1 8.93 99.1 8,000 45.5 514 18.13 5.19
APC 8x6-SF 11.1 10.87 120.7 7,540 42.8 590 20.81 4.89
APC 8x8-E 11.1 11.30 125.4 7,460 56.5 489 17.25 3.90
APC 9x3.8-SF 11.1 9.11 101.1 7,940 28.6 673 23.74 6.66
APC 9x4.5-E 11.1 8.32 92.4 8,130 34.6 647 22.82 7.01
APC 9x4.7-SF 11.1 9.15 101.6 7,930 35.3 683 24.09 6.72
APC 9x6-E 11.1 9.52 105.7 7,860 44.7 645 22.75 6.10
APC 9x6-SF 11.1 14.20 157.6 6,750 38.4 755 26.63 4.79
APC 9x7.5-E 11.1 12.92 143.4 7,070 50.2 655 23.10 4.57
APC 9x7.5-SF 11.1 15.91 176.6 6,310 44.8 686 24.20 3.88
APC 10x3.8-SF 11.1 13.09 145.3 6,970 25.1 870 30.69 5.99
APC 10x4.7-SF 11.1 13.89 154.2 6,780 30.2 887 31.29 5.75
APC 10x5-E 11.1 11.11 123.3 7,470 35.4 776 27.37 6.29
APC 10x6-E 11.1 12.02 133.4 7,260 41.3 821 28.96 6.15
APC 10x7-E 11.1 13.40 148.7 6,950 46.1 834 29.42 5.61
APC 10x10-E 11.1 17.53 194.6 5,880 55.7 613 21.62 3.15
APC 11x3.8-SF 11.1 14.23 158.0 6,700 24.1 953 33.62 6.03
APC 11x4.7-SF 11.1 16.14 179.2 6,210 27.6 1000 35.27 5.58
APC 11x5.5-E 11.1 14.00 155.4 6,790 35.4 956 33.72 6.15
APC 11x7-E 11.1 15.58 172.9 6,390 42.4 941 33.19 5.44
APC 11x8-E 11.1 16.41 182.2 6,140 46.5 902 31.82 4.95
GWS 8x4-DD 11.1 4.78 53.1 8,960 33.9 425 14.99 8.01
GWS 8x4x3-DD 11.1 5.79 64.3 8,710 33.0 468 16.51 7.28
GWS 9x5-DD 11.1 8.15 90.5 8,160 38.6 651 22.96 7.20
GWS 9x5x3-DD 11.1 10.08 111.9 7,730 36.6 704 24.83 6.29
GWS 10x6-DD 11.1 10.66 118.3 7,590 43.1 773 27.27 6.53
GWS 10x6x3-DD 11.1 13.23 146.9 6,980 39.7 882 31.11 6.01
 
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 14.8 6.47 95.8 11,690 44.3 556 19.61 5.81
APC 7x5-E 14.8 8.20 121.4 11,230 53.2 572 20.18 4.71
APC 7x6-E 14.8 8.62 127.6 11,110 63.1 616 21.73 4.83
APC 8x4-E 14.8 9.46 140.0 10,900 41.3 764 26.95 5.46
APC 8x6-E 14.8 13.29 196.7 9,880 56.1 849 29.95 4.32
APC 8x8-E 14.8 16.53 244.6 9,020 68.3 728 25.68 2.98
APC 9x4.5-E 14.8 12.74 188.6 10,010 42.7 1018 35.91 5.40
APC 9x6-E 14.8 14.27 211.2 9,600 54.5 978 34.50 4.63
APC 10x5-E 14.8 16.43 243.2 8,980 42.5 1155 40.74 4.75
GWS 8x4-DD 14.8 7.51 111.1 11,400 43.2 698 24.62 6.28
GWS 8x4x3-DD 14.8 9.14 135.3 10,970 41.6 770 27.16 5.69
GWS 9x5-DD 14.8 12.47 184.6 10,080 47.7 1030 36.33 5.58
GWS 9x5x3-DD 14.8 14.89 220.4 9,380 44.4 1058 37.32 4.80
GWS 10x6-DD 14.8 15.62 231.2 9,200 52.3 1161 40.95 5.02
                   
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.