Cobra C3525/18 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (6S)
18-Turn Delta 430 RPM/Volt Io = 0.84 Amps @ 20v Rm = 0.058 Ohms 38 Amps 840 W 
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
43.0 mm,  1.69 in. 51.0 mm,  2.01 in. 73.0 mm,  2.87 in. 5.00 mm,  0.197 in. 253 gm,   8.92 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 14.8 22.08 326.8 5,048 57.4 1360 47.97 4.16
APC 15x8-E 14.8 15.85 234.6 5,363 40.6 1727 60.92 7.36
APC 15x10-E 14.8 21.24 314.3 5,058 47.9 1906 67.23 6.06
APC 16x8-E 14.8 22.57 334.1 5,023 38.1 2243 79.12 6.71
APC 16x10-E 14.8 24.82 367.4 4,879 46.2 2233 78.77 6.08
APC 17x8-E 14.8 24.91 368.6 4,899 37.1 2470 87.13 6.70
APC 17x10-E 14.8 28.57 422.9 4,653 44.1 2475 87.30 5.85
APC 17x12-E 14.8 32.28 477.7 4,483 50.9 2289 80.74 4.79
APC 18x8-E 14.8 26.47 391.7 4,799 36.4 2745 96.83 7.01
APC 18x10-E 14.8 29.76 440.4 4,593 43.5 2797 98.66 6.35
APC 18x12-E 14.8 38.14 564.4 4,186 47.6 2404 84.80 4.26
APC 19x8-E 14.8 32.86 486.4 4,450 33.7 3068 108.22 6.31
APC 19x10-E 14.8 33.32 493.2 4,420 41.9 3098 109.28 6.28
APC 19x12-E 14.8 37.51 555.1 4,201 47.7 3145 110.94 5.67
APC 20x8-E 14.8 34.99 517.9 4,332 32.8 3348 118.10 6.47
APC 20x10-E 14.8 39.13 579.1 4,124 39.1 3413 120.39 5.89
MAS 14x7x3 14.8 17.15 253.8 5,314 35.2 1786 63.00 7.04
MAS 14x9x3 14.8 20.32 300.7 5,129 43.7 1984 69.98 6.60
MAS 15x7x3 14.8 21.06 311.7 5,100 33.8 2130 75.13 6.83
MAS 16x8x3 14.8 24.15 357.4 4,931 37.4 2392 84.37 6.69
MAS 16x10x3 14.8 29.67 439.1 4,618 43.7 2686 94.74 6.12
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 12x10-E 18.5 17.52 324.2 6,730 63.7 1516 53.47 4.68
APC 12x12-E 18.5 20.78 384.4 6,526 74.2 1371 48.36 3.57
APC 13x8-E 18.5 17.72 327.7 6,711 50.8 1892 66.74 5.77
APC 13x10-E 18.5 23.25 430.0 6,381 60.4 1753 61.83 4.08
APC 14x7-E 18.5 20.00 370.0 6,578 43.6 2211 77.99 5.98
APC 14x8.5-E 18.5 21.32 394.4 6,488 52.2 2290 80.78 5.81
APC 14x10-E 18.5 21.44 396.7 6,476 61.3 2261 79.75 5.70
APC 14x12-E 18.5 31.12 575.7 5,929 67.4 1903 67.13 3.31
APC 15x6-E 18.5 21.04 389.2 6,495 36.9 2489 87.80 6.39
APC 15x8-E 18.5 22.62 418.5 6,413 48.6 2530 89.24 6.05
APC 15x10-E 18.5 30.56 565.3 5,952 56.4 2694 95.03 4.77
APC 16x8-E 18.5 31.87 589.7 5,840 44.2 3102 109.42 5.26
APC 16x10-E 18.5 34.98 647.0 5,665 53.6 3092 109.07 4.78
APC 17x8-E 18.5 34.53 638.8 5,682 43.0 3399 119.89 5.32
APC 17x10-E 18.5 40.42 747.8 5,398 51.1 3317 117.00 4.44
APC 18x8-E 18.5 36.10 667.8 5,628 42.6 3783 133.44 5.66
MAS 12x8x3 18.5 18.63 344.7 6,658 50.4 1997 70.44 5.79
MAS 13x8x3 18.5 20.26 374.8 6,509 49.3 2166 76.40 5.78
MAS 14x7x3 18.5 23.90 442.2 6,331 42.0 2580 91.01 5.83
MAS 14x9x3 18.5 28.08 519.5 6,078 51.8 2842 100.25 5.47
MAS 15x7x3 18.5 29.00 536.6 6,034 40.0 3020 106.53 5.63
MAS 16x8x3 18.5 32.73 605.4 5,796 43.9 3327 117.36 5.50
MAS 16x10x3 18.5 40.34 746.3 5,392 51.1 3652 128.82 4.89
 
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 22.2 16.93 375.9 8,181 65.9 1691 59.65 4.50
APC 11x10-E 22.2 20.07 445.6 7,980 75.6 1552 54.74 3.48
APC 12x6-E 22.2 15.86 352.2 8,220 46.7 2001 70.58 5.68
APC 12x8-E 22.2 19.94 442.6 7,949 60.2 1844 65.04 4.17
APC 12x10-E 22.2 24.09 534.8 7,715 73.1 2029 71.57 3.79
APC 12x12-E 22.2 27.02 599.8 7,539 85.7 1825 64.37 3.04
APC 13x6.5-E 22.2 22.18 492.4 7,845 48.3 2547 89.84 5.17
APC 13x8-E 22.2 24.07 534.4 7,716 58.5 2525 89.07 4.73
APC 13x10-E 22.2 31.58 701.1 7,266 68.8 2319 81.80 3.31
APC 14x7-E 22.2 27.40 608.2 7,507 49.8 2963 104.52 4.87
APC 14x8.5-E 22.2 28.32 628.8 7,414 59.7 3043 107.34 4.84
APC 14x10-E 22.2 28.58 634.4 7,435 70.4 2971 104.80 4.68
APC 14x12-E 22.2 39.82 884.0 6,740 76.6 2413 85.12 2.73
APC 15x4-E 22.2 22.04 489.2 7,860 29.8 2978 105.04 6.09
APC 15x6-E 22.2 28.67 636.5 7,428 42.2 3384 119.37 5.32
APC 15x8-E 22.2 30.03 666.6 7,346 55.7 3344 117.95 5.02
APC 15x10-E 22.2 43.59 967.7 6,717 63.6 3439 121.31 3.55
MAS 12x6x3 22.2 17.51 388.8 8,151 46.3 2128 75.06 5.47
MAS 12x8x3 22.2 24.45 542.7 7,690 58.3 2684 94.67 4.95
MAS 13x8x3 22.2 26.79 594.7 7,542 57.1 2933 103.46 4.93
MAS 14x7x3 22.2 30.96 687.2 7,285 48.3 3402 120.00 4.95
MAS 14x9x3 22.2 36.03 800.0 6,952 59.3 3667 129.35 4.58
MAS 15x7x3 22.2 37.35 829.2 6,879 45.6 3906 137.78 4.71
MAS 16x8x3 22.2 42.55 944.5 6,624 50.2 4345 153.26 4.60
 
Prop Prop Input Motor Watts Prop Pitch Thrust  Thrust Thrust Eff.
Manf. Size Voltage Amps Input RPM Speed Grams Ounces Grams/W
APC 10x7-E 29.6 17.66 522.8 10,823 71.7 1977 69.74 3.78
APC 10x10-E 29.6 26.64 788.5 10,216 96.7 1820 64.20 2.31
APC 11x5.5-E 29.6 19.99 591.7 10,774 56.1 2623 92.52 4.43
APC 11x7-E 29.6 23.67 700.7 10,488 69.5 2769 97.67 3.95
APC 11x8-E 29.6 25.33 749.8 10,236 77.5 2562 90.37 3.42
APC 11x8.5-E 29.6 28.13 832.7 10,135 81.6 2591 91.39 3.11
APC 11x10-E 29.6 31.78 940.7 9,882 93.6 2399 84.62 2.55
APC 12x6-E 29.6 26.79 793.1 10,231 58.1 3315 116.93 4.18
APC 12x8-E 29.6 32.28 955.5 9,840 74.5 2920 103.00 3.06
APC 12x10-E 29.6 39.00 1154.5 9,416 89.2 2978 105.04 2.58
APC 13x4-E 29.6 22.42 663.5 10,594 40.1 3307 116.65 4.98
APC 13x6.5-E 29.6 36.72 1086.8 9,537 58.7 3817 134.64 3.51
APC 13x8-E 29.6 38.38 1136.1 9,288 70.4 3684 129.95 3.24
APC 15x4-E 29.6 36.41 1077.6 9,603 36.4 4763 168.01 4.42
MAS 10x5x3 29.6 13.71 405.9 11,317 53.6 1966 69.35 4.84
MAS 10x7x3 29.6 19.98 591.3 10,799 71.6 2520 88.89 4.26
MAS 11x7x3 29.6 24.25 717.8 10,463 69.4 3013 106.28 4.20
MAS 11x8x3 29.6 25.65 759.3 10,230 77.5 3026 106.74 3.99
MAS 12x6x3 29.6 27.19 804.7 10,252 58.3 3456 121.91 4.29
MAS 12x8x3 29.6 37.28 1103.3 9,521 72.1 4190 147.80 3.80
MAS 13x8x3 29.6 40.01 1184.3 9,184 69.6 4448 156.90 3.76
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.