Cobra C3515/12 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
12-Turn Delta 1100 RPM/Volt Io = 1.64 Amps @ 10v Rm = 0.024 Ohms 45 Amps 670 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
43.0 mm,  1.69 in. 41.0 mm,  1.61 in. 63.0 mm,  2.48 in. 5.00 mm,  0.197 in. 178 gm,   6.28 oz
 
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 11.1 20.47 227.3 10,616 60.3 965 34.04 4.25
APC 8x8-E 11.1 26.49 294.1 10,066 76.3 866 30.55 2.94
APC 9x6-E 11.1 22.31 247.7 10,446 59.4 1136 40.07 4.59
APC 9x7.5-E 11.1 32.83 364.4 9,606 68.2 1185 41.80 3.25
APC 9x9-E 11.1 37.11 411.9 9,356 79.7 1189 41.94 2.89
APC 10x5-E 11.1 26.81 297.5 10,104 47.8 1448 51.08 4.87
APC 10x6-E 11.1 28.67 318.3 9,911 56.3 1546 54.53 4.86
APC 10x7-E 11.1 32.86 364.8 9,668 64.1 1619 57.11 4.44
APC 10x10-E 11.1 45.84 508.8 8,780 83.1 1384 48.82 2.72
APC 11x5.5-E 11.1 35.82 397.6 9,450 49.2 1911 67.41 4.81
APC 11x7-E 11.1 41.73 463.2 9,041 59.9 1984 69.98 4.28
APC 11x8-E 11.1 44.68 496.0 8,865 67.2 1913 67.48 3.86
APC 11x8.5-E 11.1 47.58 528.1 8,680 69.9 1897 66.91 3.59
APC 12x6-E 11.1 45.45 504.5 8,806 50.0 2298 81.06 4.56
APC 13x4-E 11.1 35.65 395.7 9,400 35.6 2183 77.00 5.52
MAS 8x6x3 11.1 19.75 219.2 10,676 60.7 1039 36.65 4.74
MAS 9x7x3 11.1 29.96 332.6 9,821 65.1 1510 53.26 4.54
MAS 10x5x3 11.1 27.16 301.5 10,093 47.8 1545 54.50 5.12
MAS 10x7x3 11.1 37.84 420.0 9,328 61.8 1879 66.28 4.47
MAS 11x7x3 11.1 44.57 494.7 8,901 59.0 2149 75.80 4.34
MAS 11x8x3 11.1 48.59 539.3 8,700 65.9 2249 79.33 4.17
 
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 14.8 21.63 320.2 14,081 53.3 1313 46.31 4.10
APC 8x6-E 14.8 34.20 506.1 13,065 74.2 1512 53.33 2.99
APC 8x8-E 14.8 42.96 635.9 12,408 94.0 1341 47.30 2.11
APC 9x4.5-E 14.8 30.82 456.2 13,342 56.9 1904 67.16 4.17
APC 9x6-E 14.8 35.36 523.3 12,992 73.8 1818 64.13 3.47
APC 10x5-E 14.8 43.04 636.9 12,395 58.7 2200 77.60 3.45
APC 10x6-E 14.8 44.77 662.6 12,206 69.4 2370 83.60 3.58
APC 10x7-E 14.8 51.75 765.9 11,791 78.2 2444 86.21 3.19
MAS 8x6x3 14.8 30.28 448.1 13,416 76.2 1715 60.49 3.83
MAS 9x7x3 14.8 45.31 670.6 12,249 81.2 2372 83.67 3.54
MAS 10x5x3 14.8 40.77 603.4 12,498 59.2 2441 86.10 4.05
MAS 10x7x3 14.8 56.48 835.9 11,458 76.0 2865 101.06 3.43
 
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 18.5 21.57 399.1 17,721 67.1 1359 47.94 3.40
APC 7x5-E 18.5 26.88 497.3 17,240 81.6 1383 48.78 2.78
APC 7x6-E 18.5 27.96 517.2 17,049 96.9 1465 51.68 2.83
APC 8x4-E 18.5 32.41 599.5 16,721 63.3 1855 65.43 3.09
APC 8x6-E 18.5 50.75 938.8 15,163 86.2 2001 70.58 2.13
APC 9x4.5-E 18.5 44.76 828.1 15,655 66.7 2736 96.51 3.30
MAS 8x6x3 18.5 41.54 768.5 15,923 90.5 2424 85.50 3.15
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.