Cobra C2208/34 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
34-Turn Delta 1180 RPM/Volt Io = 0.40 Amps @ 8v Rm = 0.152 Ohms 12 Amps 130 W
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
27.7 mm,  1.09in. 24.0 mm,  0.94 in. 38.0 mm,  1.50 in. 3.17 mm,  0.125 in. 47.0 gm,   1.66 oz
 
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 7.4 5.87 43.4 6,980 25.1 358 12.63 8.24
APC 8x4-E 7.4 5.38 39.8 7,140 27.0 335 11.82 8.41
APC 8x6-E 7.4 7.41 54.8 6,510 37.0 336 11.85 6.13
APC 8x6-SF 7.4 8.58 63.5 6,130 34.8 382 13.47 6.02
APC 9x3.8-SF 7.4 7.44 55.1 6,500 23.4 438 15.45 7.96
APC 9x4.5-E 7.4 7.09 52.5 6,600 28.1 425 14.99 8.10
APC 9x4.7-SF 7.4 7.92 58.6 6,340 28.2 451 15.91 7.70
APC 9x6-E 7.4 8.19 60.6 6,270 35.6 444 15.66 7.33
APC 9x6-SF 7.4 10.78 79.8 5,400 30.7 466 16.44 5.84
APC 9x7.5-E 7.4 10.49 77.6 5,530 39.3 393 13.86 5.06
APC 9x7.5-SF 7.4 11.89 88.0 5,040 35.8 443 15.63 5.03
APC 10x3.8-SF 7.4 10.28 76.1 5,570 20.0 539 19.01 7.09
APC 10x4.7-SF 7.4 10.91 80.7 5,350 23.8 552 19.47 6.84
APC 10x5-E 7.4 9.08 67.2 5,960 28.2 506 17.85 7.53
APC 10x6-E 7.4 9.66 71.5 5,760 32.7 495 17.46 6.92
APC 10x7-E 7.4 10.59 78.4 5,440 36.1 492 17.35 6.28
APC 10x7-SF 7.4 12.90 95.5 4,680 31.0 527 18.59 5.52
APC 11x3.8-SF 7.4 10.91 80.7 5,350 19.3 577 20.35 7.15
APC 11x4.7-SF 7.4 12.46 92.2 4,850 21.6 603 21.27 6.54
APC 11x5.5-E 7.4 10.97 81.2 5,310 27.7 570 20.11 7.02
APC 9x4.5-E 7.4 12.67 93.8 7,730 32.9 586 20.67 6.25
GWS 8x4-DD 7.4 4.31 31.9 7,470 28.3 291 10.26 9.12
GWS 8x4x3-DD 7.4 5.38 39.8 7,140 27.0 334 11.78 8.39
GWS 8x4.3-SF 7.4 5.89 43.6 6,990 28.5 350 12.35 8.03
GWS 8x6-SF 7.4 7.40 54.8 6,510 37.0 386 13.62 7.05
GWS 9x4.7-SF 7.4 8.40 62.2 6,190 27.6 466 16.44 7.50
GWS 9x5-DD 7.4 7.05 52.2 6,620 31.3 433 15.27 8.30
GWS 9x5x3-DD 7.4 8.41 62.2 6,190 29.3 464 16.37 7.46
GWS 10x6-DD 7.4 8.93 66.1 6,020 34.2 496 17.50 7.51
GWS 10x6x3-DD 7.4 10.83 80.1 5,390 30.6 550 19.40 6.86
 
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 11.1 6.87 76.3 10,640 40.3 470 16.58 6.16
APC 7x4-SF 11.1 6.70 74.4 10,690 40.5 448 15.80 6.02
APC 7x5-E 11.1 8.24 91.5 10,180 48.2 498 17.57 5.44
APC 7x5-SF 11.1 8.26 91.7 10,150 48.1 478 16.86 5.21
APC 7x6-E 11.1 8.84 98.1 9,940 56.5 498 17.57 5.08
APC 7x6-SF 11.1 9.73 108.0 9,630 54.7 460 16.23 4.26
APC 8x3.8-SF 11.1 10.66 118.3 9,250 33.3 663 23.39 5.60
APC 8x4-E 11.1 9.59 106.4 9,660 36.6 627 22.12 5.89
APC 8x6-E 11.1 12.35 137.1 8,590 48.8 617 21.76 4.50
APC 8x6-SF 11.1 14.55 161.5 7,720 43.9 621 21.90 3.85
APC 9x3.8-SF 11.1 12.95 143.7 8,360 30.1 773 27.27 5.38
APC 9x4.5-E 11.1 12.22 135.6 8,670 36.9 741 26.14 5.46
APC 9x4.7-SF 11.1 12.87 142.9 8,370 37.3 779 27.48 5.45
GWS 8x4-DD 11.1 7.78 86.4 10,320 39.1 579 20.42 6.70
GWS 9x5-DD 11.1 11.95 132.6 8,760 41.5 773 27.27 5.83
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.