Tempest 2826-920 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 10-Turn Delta 920 RPM/Volt Io = 2.74 Amps @ 10v Rm = 0.031 Ohms 58 Amps 860 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 35.4 mm,  1.394 in. 44.4 mm,  1.748 in. 66.8 mm,  2.630 in. 5.00 mm,  0.197 in. 166 gm,   5.86 oz
 
Test Data From Input 8.0 V 10.0 V 12.0V 14.0V Measured Kv value Measured Rm Value
Sample Motor Io Value 2.644 A 2.735 A 2.887 A 2.958 A 916 RPM/Volt @ 10v 0.0314 Ohms
 
3-cell Li-Po Test Data
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 9x7.5-E 3 11.1 26.00 288.6 9,135 64.9 1113 39.25 3.86
APC 9x8x3-E 3 11.1 27.74 307.9 9,052 68.6 1435 50.60 4.66
APC 9x9-E 3 11.1 30.44 337.9 8,865 75.6 1091 38.47 3.23
APC 10x6-F 3 11.1 19.17 212.8 9,525 54.1 1149 40.51 5.40
APC 10x7-E 3 11.1 27.14 301.3 9,067 60.1 1419 50.06 4.71
APC 10x8-E 3 11.1 30.93 343.3 8,823 66.8 1402 49.45 4.08
APC 10x10-E 3 11.1 39.64 440.0 8,274 78.4 1201 42.35 2.73
APC 11x5.5-E 3 11.1 29.37 326.0 8,926 46.5 1737 61.28 5.33
APC 11x7-E 3 11.1 34.35 381.3 8,615 57.1 1817 64.10 4.77
APC 11x7x3-E 3 11.1 34.52 383.2 8,636 57.2 1938 68.35 5.06
APC 11x8-E 3 11.1 36.49 405.0 8,448 64.0 1771 62.45 4.37
APC 11x8-F 3 11.1 31.64 351.2 8,800 66.7 1717 60.55 4.89
APC 11x8.5-E 3 11.1 39.33 436.6 8,290 66.7 1775 62.60 4.06
APC 11x10-E 3 11.1 44.41 492.9 7,946 75.2 1550 54.69 3.15
APC 12x6-E 3 11.1 37.15 412.3 8,422 47.9 2091 73.76 5.07
APC 12x8-E 3 11.1 44.60 495.0 7,939 60.1 1862 65.69 3.76
APC 12x8.5-F 3 11.1 39.67 440.4 8,288 66.7 2096 73.95 4.76
APC 12x10-E 3 11.1 51.92 576.3 7,543 71.4 1908 67.31 3.31
APC 12x12-E 3 11.1 56.83 630.9 7,076 80.4 1634 57.63 2.59
APC 13x4-E 3 11.1 33.08 367.2 8,689 32.9 2121 74.81 5.78
APC 13x5.5-E 3 11.1 40.20 446.2 8,225 42.8 2341 82.59 5.25
APC 13x6.5-E 3 11.1 48.47 538.0 7,725 47.5 2448 86.36 4.55
APC 13x7-F 3 11.1 43.74 485.5 8,056 53.4 2425 85.53 4.99
APC 13x8-E 3 11.1 51.56 572.3 7,493 56.8 2406 84.88 4.20
APC 13x10-E 3 11.1 62.75 696.5 6,968 66.0 2138 75.41 3.07
APC 13x10-F 3 11.1 53.30 591.6 7,426 70.3 2500 88.19 4.23
APC 14x6-E 3 11.1 46.27 513.6 7,889 44.8 2642 93.18 5.14
APC 14x7-E 3 11.1 56.25 624.4 7,192 47.7 2741 96.68 4.39
APC 14x8.5-E 3 11.1 57.86 642.3 6,972 56.1 2707 95.50 4.22
APC 15x4-E 3 11.1 48.47 538.1 7,703 29.2 2843 100.28 5.28
APC 15x6-E 3 11.1 57.67 640.1 6,960 39.5 2964 104.56 4.63
BadAss 10x6-W 3 11.1 26.34 292.4 9,136 51.9 1148 40.49 3.93
BadAss 10x7-W 3 11.1 27.81 308.6 9,046 60.0 1104 38.93 3.58
BadAss 10x8-W 3 11.1 30.84 342.3 8,860 67.1 1210 42.68 3.53
BadAss 11x5-W 3 11.1 25.04 277.9 9,218 43.6 1442 50.87 5.19
BadAss 11x6-W 3 11.1 29.17 323.8 8,964 50.9 1630 57.50 5.03
BadAss 11x7-W 3 11.1 29.45 326.9 8,941 59.3 1614 56.93 4.94
BadAss 11x8-W 3 11.1 37.31 414.1 8,425 63.8 1417 49.97 3.42
BadAss 12x6-W 3 11.1 34.88 387.2 8,616 49.0 1886 66.52 4.87
BadAss 12x7-W 3 11.1 40.50 449.5 8,240 54.6 2034 71.75 4.52
BadAss 12x8-W 3 11.1 47.48 527.0 7,823 59.3 1671 58.95 3.17
BadAss 13x6-W 3 11.1 40.82 453.1 8,220 46.7 2236 78.85 4.93
BadAss 13x8-W 3 11.1 51.83 575.4 7,505 56.9 2208 77.89 3.84
BadAss 13x10-W 3 11.1 65.31 725.0 7,025 66.5 2002 70.63 2.76
BadAss 14x6-W 3 11.1 50.67 562.4 7,601 43.2 2514 88.67 4.47
BadAss 14x8-W 3 11.1 58.54 649.8 7,300 55.3 2753 97.10 4.24
BadAss 15x6-W 3 11.1 61.01 677.3 7,163 40.7 2963 104.50 4.37
GemFan 10x6-F 3 11.1 21.12 234.4 9,435 53.6 1269 44.77 5.42
GemFan 11x8-F 3 11.1 37.52 416.5 8,434 63.9 1604 56.59 3.85
GemFan 12x8-F 3 11.1 45.25 502.3 7,953 60.3 1929 68.06 3.84
GemFan 13x8-F 3 11.1 46.54 516.6 7,874 59.7 2286 80.62 4.42
MAS 9x7x3 3 11.1 24.43 271.1 9,260 61.4 1317 46.44 4.86
MAS 10x5x3 3 11.1 22.03 244.5 9,397 44.5 1354 47.75 5.54
MAS 10x7x3 3 11.1 31.42 348.7 8,816 58.4 1684 59.39 4.83
MAS 11x7x3 3 11.1 37.09 411.7 8,467 56.1 1951 68.83 4.74
MAS 11x8x3 3 11.1 39.65 440.1 8,289 62.8 1985 70.01 4.51
MAS 12x6x3 3 11.1 40.98 454.9 8,202 46.6 2196 77.47 4.83
MAS 12x8x3 3 11.1 53.23 590.9 7,425 56.3 2513 88.65 4.25
MAS 13x8x3 3 11.1 56.02 621.8 7,161 54.3 2616 92.29 4.21
 
4-cell Li-Po Test Data
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 7x9-SP 4 14.8 20.25 299.7 12,744 108.6 723 25.49 2.41
APC 8x6-E 4 14.8 23.86 353.2 12,515 71.1 1346 47.47 3.81
APC 8x8-E 4 14.8 29.82 441.4 12,133 91.9 1309 46.18 2.97
APC 9x4.5-E 4 14.8 24.15 357.4 12,504 53.3 1646 58.07 4.61
APC 9x5-F 4 14.8 20.27 300.0 12,741 60.3 1334 47.05 4.45
APC 9x6-E 4 14.8 28.16 416.8 12,212 69.4 1623 57.26 3.89
APC 9x7.5-E 4 14.8 43.39 642.2 11,299 80.2 1748 61.67 2.72
APC 9x8x3-E 4 14.8 43.34 641.4 11,327 85.8 2280 80.42 3.55
APC 9x9-E 4 14.8 46.93 694.6 11,039 94.1 1708 60.25 2.46
APC 10x5-E 4 14.8 33.89 501.5 11,883 56.3 2064 72.80 4.12
APC 10x6-E 4 14.8 37.86 560.4 11,673 66.3 2167 76.45 3.87
APC 10x6-F 4 14.8 30.39 449.8 12,088 68.7 1909 67.35 4.24
APC 10x7-E 4 14.8 43.61 645.4 11,255 74.6 2209 77.93 3.42
APC 10x8-E 4 14.8 48.61 719.5 10,879 82.4 2151 75.88 2.99
APC 10x10-E 4 14.8 59.16 875.6 10,068 95.3 1808 63.77 2.06
APC 11x5.5-E 4 14.8 47.19 698.4 10,998 57.3 2768 97.65 3.96
APC 11x7-E 4 14.8 53.80 796.2 10,516 69.7 2797 98.66 3.51
APC 11x7x3-E 4 14.8 53.16 786.7 10,594 70.2 3031 106.92 3.85
APC 11x8-E 4 14.8 57.64 853.0 10,188 77.2 2621 92.46 3.07
APC 11x8.5-E 4 14.8 60.36 893.3 9,938 80.0 2569 90.61 2.88
APC 12x6-E 4 14.8 57.82 855.7 10,141 57.6 3184 112.33 3.72
APC 13x4-E 4 14.8 51.79 766.5 10,625 40.2 3340 117.83 4.36
APC 13x5.5-E 4 14.8 62.22 920.9 10,186 53.1 3665 129.29 3.98
BadAss 10x5-W 4 14.8 30.03 444.5 12,119 57.4 1839 64.85 4.14
BadAss 10x6-W 4 14.8 41.06 607.6 11,470 65.2 1808 63.76 2.97
BadAss 10x7-W 4 14.8 43.18 639.1 11,320 75.0 1732 61.08 2.71
BadAss 10x8-W 4 14.8 47.51 703.2 11,006 83.4 1888 66.58 2.68
BadAss 11x5-W 4 14.8 39.89 590.4 11,561 54.7 2332 82.24 3.95
BadAss 11x6-W 4 14.8 45.30 670.5 11,158 63.4 2573 90.76 3.84
BadAss 11x7-W 4 14.8 45.99 680.6 11,108 73.6 2550 89.95 3.75
BadAss 11x8-W 4 14.8 56.24 832.4 10,325 78.2 2106 74.30 2.53
BadAss 12x6-W 4 14.8 53.38 790.1 10,554 60.0 2869 101.21 3.63
BadAss 12x7-W 4 14.8 62.73 928.4 10,173 67.4 2908 102.57 3.13
BadAss 13x6-W 4 14.8 62.27 921.5 10,179 57.8 3454 121.82 3.75
GemFan 9x5-F 4 14.8 22.76 336.8 12,583 59.6 1518 53.53 4.50
GemFan 10x6-F 4 14.8 33.22 491.7 11,937 67.8 2072 73.07 4.21
GemFan 11x8-F 4 14.8 57.01 843.8 10,255 77.7 2420 85.35 2.87
MAS 8x6x3 4 14.8 24.10 356.6 12,490 71.0 1465 51.66 4.11
MAS 9x7x3 4 14.8 38.35 567.6 11,654 77.3 2155 76.01 3.80
MAS 10x5x3 4 14.8 34.33 508.0 11,886 56.3 2211 77.99 4.35
MAS 10x7x3 4 14.8 47.78 707.2 10,963 72.7 2635 92.93 3.73
MAS 11x7x3 4 14.8 55.34 819.0 10,381 68.8 2968 104.71 3.62
MAS 11x8x3 4 14.8 60.56 896.3 10,347 78.4 3084 108.78 3.44
MAS 12x6x3 4 14.8 61.82 915.0 10,206 58.0 3397 119.81 3.71
 
5-cell Li-Po Test Data
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 7x7-E 5 18.5 27.35 506.0 15,662 103.8 1323 46.65 2.61
APC 7x9-SP 5 18.5 29.65 548.5 15,529 132.3 1069 37.69 1.95
APC 8x4-E 5 18.5 25.51 471.9 15,770 59.7 1683 59.35 3.57
APC 8x6-E 5 18.5 36.74 679.6 15,020 85.3 1981 69.88 2.91
APC 8x8-E 5 18.5 44.49 823.0 14,424 109.3 1878 66.25 2.28
APC 9x4.5-E 5 18.5 36.76 680.0 15,019 64.0 2484 87.61 3.65
APC 9x6-E 5 18.5 42.43 785.0 14,556 82.7 2348 82.82 2.99
APC 9x7.5-E 5 18.5 62.11 1148.9 13,328 94.7 2371 83.65 2.06
APC 9x8x3-E 5 18.5 61.73 1142.0 13,347 101.1 3210 113.24 2.81
APC 9x9-E 5 18.5 66.60 1232.1 13,084 111.5 2386 84.17 1.94
APC 10x5-E 5 18.5 50.24 929.5 13,947 66.0 2842 100.25 3.06
APC 10x6-E 5 18.5 54.67 1011.3 13,586 77.2 2914 102.79 2.88
APC 10x7-E 5 18.5 63.24 1170.0 13,259 87.9 3019 106.51 2.58
BadAss 10x5-W 5 18.5 44.45 822.4 14,430 68.3 2602 91.79 3.16
BadAss 10x6-W 5 18.5 56.74 1049.7 13,403 76.2 2445 86.23 2.33
BadAss 10x7-W 5 18.5 60.08 1111.5 13,448 89.1 2398 84.60 2.16
BadAss 11x5-W 5 18.5 56.39 1043.1 13,443 63.7 3154 111.26 3.02
BadAss 11x6-W 5 18.5 64.07 1185.3 13,178 74.9 3572 126.00 3.01
GemFan 7x6-F 5 18.5 26.06 482.2 15,743 89.4 1054 37.19 2.19
GemFan 7.5x4-F 5 18.5 35.24 651.8 15,114 57.3 1767 62.32 2.71
GemFan 8x5-F 5 18.5 24.10 445.9 15,845 75.0 1597 56.33 3.58
GemFan 9x5-F 5 18.5 33.24 615.0 15,265 72.3 2266 79.93 3.68
GemFan 10x6-F 5 18.5 47.61 880.9 14,175 80.5 2990 105.47 3.39
MAS 8x6x3 5 18.5 35.26 652.3 15,120 85.9 2197 77.48 3.37
MAS 9x7x3 5 18.5 52.99 980.3 13,746 91.1 3021 106.57 3.08
MAS 10x5x3 5 18.5 48.77 902.2 14,081 66.7 3168 111.74 3.51
 
6-cell Li-Po Test Data
Prop Prop Li-Po Input Motor Input Prop Pitch Speed Thrust  Thrust Thrust Eff.
Manf. Size Cells Voltage Amps Watts RPM in MPH Grams Ounces Grams/W
APC 7x4-E 6 22.2 24.05 533.8 19,117 72.4 1635 57.69 3.06
APC 7x5-E 6 22.2 29.94 664.7 18,675 88.4 1653 58.29 2.49
APC 7x6-E 6 22.2 31.12 691.0 18,586 105.6 1780 62.78 2.58
APC 7x7-E 6 22.2 37.96 842.7 18,072 119.8 1758 62.01 2.09
APC 7x9-SP 6 22.2 39.39 874.4 17,966 153.1 1417 49.97 1.62
APC 8x4-E 6 22.2 36.12 801.8 18,211 69.0 2257 79.60 2.81
APC 8x6-E 6 22.2 50.66 1124.5 17,094 97.1 2547 89.85 2.27
APC 8x8-E 6 22.2 59.43 1319.4 16,368 124.0 2409 84.97 1.83
APC 9x4.5-E 6 22.2 50.88 1129.6 17,070 72.7 3310 116.76 2.93
APC 9x6-E 6 22.2 60.71 1347.9 16,264 92.4 2951 104.10 2.19
BadAss 10x5-W 6 22.2 60.38 1340.4 16,538 78.3 3241 114.32 2.42
GemFan 7x6-F 6 22.2 33.44 742.4 18,415 104.6 1433 50.53 1.93
GemFan 7.5x4-F 6 22.2 47.05 1044.5 17,351 65.7 2368 83.52 2.27
GemFan 8x5-F 6 22.2 31.82 706.5 18,534 87.8 2181 76.92 3.09
MAS 7x4x3 6 22.2 23.38 519.1 19,191 72.7 1581 55.78 3.05
MAS 8x6x3 6 22.2 46.36 1029.2 17,423 99.0 2946 103.91 2.86
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)
Notes about Propellers used in the Motor Tests
APC Props with -E on the part number are from the APC Thin Electric Series.  Example:  APC 10x6-E
APC Props with -F on the part number are from the APC Folding Electric Series.  Example:  APC 11x8-F
APC Props with -SF on the part number are from the APC Slow-Fly Electric Series.  Example:  APC 10x4.7-SF
APC Props with -P on the part number are from the APC Pylon Racing Series.  Example:  APC 6.5x5.5-P
BadAss Props with -W on the part number are from the BadAss Electric Wood Series.  Example:  BadAss 11x6-W
GemFan Props with -F on the part number are from the GemFan Folding Electric Series.  Example:  GemFan 10x6-F
MAS Props are Master Airscrew 3-Blade Propellers.  Example:  MAS 10x5x3
PLEASE NOTE:
The Data contained in this Prop Chart is based on actual measurements, taken in a controlled test environment, at an altitude of
584 feet above sea level.  The test voltages used are based on the standard output of a Li-Po battery under load, which is 3.70 volts
per cell.  If you are using a battery that is larger in capacity than normal, or has a very high C-rating, then your actual voltages will
be higher than those shown in the chart, and this will result in a higher current and power value for every prop used.  You should
always test your actual power system with a watt meter before flying your model to make sure that you are not exceeding the 
recommended current and power ratings of the motor being used.  The prop recommendations in this chart assume that the motor
receives adequate cooling throughout its operation.  If your motor is being used inside a cowl or fuselage, you must ensure that
the motor receives sufficient airflow, and does not get too hot during operation.  It is always best to use a prop size that pulls no
more than 80% of the motors maximum recommended current value to ensure safe operation under all conditions.