Tempest 2826-1140 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 8-Turn Delta 1140 RPM/Volt Io = 3.40 Amps @ 10v Rm = 0.022 Ohms 70 Amps 1035 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. 165 gm,   5.82 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 3.156 A 3.400 A 3.585 A 3.691 A 1119 RPM/Volt @ 10v 0.0223 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 8x8-E 3 11.1 29.27 324.9 11,040 83.6 1070 37.74 3.29
APC 9x6-E 3 11.1 27.94 310.1 11,116 63.2 1340 47.27 4.32
APC 9x7.5-E 3 11.1 42.18 468.1 10,274 73.0 1401 49.42 2.99
APC 9x8x3-E 3 11.1 43.28 480.4 10,340 78.3 1872 66.03 3.90
APC 9x9-E 3 11.1 46.32 514.2 10,035 85.5 1382 48.75 2.69
APC 10x5-E 3 11.1 32.52 360.9 10,765 51.0 1659 58.52 4.60
APC 10x6-E 3 11.1 36.58 406.0 10,563 60.0 1748 61.66 4.30
APC 10x6-F 3 11.1 30.59 339.6 11,101 63.1 1568 55.31 4.62
APC 10x7-E 3 11.1 42.52 472.0 10,202 67.6 1773 62.54 3.76
APC 10x8-E 3 11.1 47.09 522.7 9,954 75.4 1772 62.50 3.39
APC 10x10-E 3 11.1 58.93 654.1 9,204 87.2 1486 52.42 2.27
APC 11x5.5-E 3 11.1 46.17 512.5 10,006 52.1 2247 79.26 4.38
APC 11x7-E 3 11.1 52.86 586.7 9,595 63.6 2292 80.85 3.91
APC 11x7x3-E 3 11.1 53.36 592.3 9,738 64.6 2533 89.35 4.28
APC 11x8-E 3 11.1 56.60 628.3 9,383 71.1 2184 77.04 3.48
APC 11x8-F 3 11.1 49.23 546.5 9,959 75.4 2224 78.45 4.07
APC 11x8.5-E 3 11.1 60.36 670.0 9,164 73.8 2135 75.31 3.19
APC 11x10-E 3 11.1 66.58 739.1 8,741 82.8 1870 65.96 2.53
APC 12x6-E 3 11.1 57.73 640.8 9,320 53.0 2652 93.55 4.14
APC 12x8-E 3 11.1 66.66 739.9 8,700 65.9 2245 79.19 3.03
APC 12x8.5-F 3 11.1 60.31 669.5 9,297 74.8 2652 93.55 3.96
APC 12x10-E 3 11.1 78.46 870.9 8,334 78.9 2299 81.09 2.64
APC 13x4-E 3 11.1 50.52 560.8 9,752 36.9 2704 95.38 4.82
APC 13x5.5-E 3 11.1 60.12 667.3 9,163 47.7 2912 102.72 4.36
APC 13x6.5-E 3 11.1 74.34 825.2 8,583 52.8 3049 107.55 3.69
BadAss 10x5-W 3 11.1 30.35 336.9 11,116 52.6 1511 53.30 4.48
BadAss 10x6-W 3 11.1 40.05 444.6 10,514 59.7 1485 52.38 3.34
BadAss 10x7-W 3 11.1 42.90 476.2 10,341 68.5 1423 50.19 2.99
BadAss 10x8-W 3 11.1 47.08 522.6 10,076 76.3 1542 54.39 2.95
BadAss 11x5-W 3 11.1 39.59 439.4 10,565 50.0 1937 68.32 4.41
BadAss 11x6-W 3 11.1 45.29 502.7 10,222 58.1 2149 75.80 4.27
BadAss 11x7-W 3 11.1 46.01 510.7 10,159 67.3 2145 75.66 4.20
BadAss 11x8-W 3 11.1 57.07 633.5 9,479 71.8 1784 62.93 2.82
BadAss 12x6-W 3 11.1 53.43 593.1 9,695 55.1 2412 85.08 4.07
BadAss 12x7-W 3 11.1 62.25 691.0 9,202 61.0 2462 86.84 3.56
BadAss 12x8-W 3 11.1 69.35 769.8 8,636 65.4 2015 71.08 2.62
BadAss 13x6-W 3 11.1 62.06 688.8 9,164 52.1 2840 100.18 4.12
BadAss 13x8-W 3 11.1 78.44 870.7 8,407 63.7 2755 97.18 3.16
GemFan 9x5-F 3 11.1 23.51 261.0 11,535 54.6 1270 44.80 4.87
GemFan 10x6-F 3 11.1 33.60 373.0 10,914 62.0 1723 60.78 4.62
GemFan 11x8-F 3 11.1 58.57 650.2 9,416 71.3 2021 71.29 3.11
GemFan 12x8-F 3 11.1 69.12 767.2 8,672 65.7 2341 82.57 3.05
GemFan 13x8-F 3 11.1 68.12 756.1 8,778 66.5 2832 99.89 3.75
MAS 8x6x3 3 11.1 24.87 276.1 11,454 65.1 1235 43.56 4.47
MAS 9x7x3 3 11.1 38.10 422.9 10,653 70.6 1773 62.54 4.19
MAS 10x5x3 3 11.1 34.72 385.3 10,853 51.4 1831 64.59 4.75
MAS 10x7x3 3 11.1 48.12 534.1 10,031 66.5 2198 77.53 4.12
MAS 11x7x3 3 11.1 56.24 624.2 9,534 63.2 2492 87.90 3.99
MAS 11x8x3 3 11.1 60.29 669.2 9,302 70.5 2520 88.89 3.77
MAS 12x6x3 3 11.1 61.77 685.7 9,206 52.3 2763 97.46 4.03
MAS 12x8x3 3 11.1 76.02 843.8 8,085 61.3 2984 105.26 3.54
 
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 7x7-E 4 14.8 31.29 463.1 15,081 100.0 1214 42.82 2.62
APC 8x4-E 4 14.8 28.11 416.0 15,098 57.2 1528 53.90 3.67
APC 8x6-E 4 14.8 40.21 595.2 14,330 81.4 1766 62.29 2.97
APC 8x8-E 4 14.8 48.58 718.9 13,792 104.5 1696 59.82 2.36
APC 9x4.5-E 4 14.8 40.40 598.0 14,330 61.1 2241 79.05 3.75
APC 9x6-E 4 14.8 46.26 684.7 13,908 79.0 2111 74.46 3.08
APC 9x7.5-E 4 14.8 67.87 1004.5 12,446 88.4 2073 73.12 2.06
APC 9x8x3-E 4 14.8 66.26 980.6 12,685 96.1 2860 100.88 2.92
APC 9x9-E 4 14.8 71.05 1051.5 12,206 104.0 2063 72.77 1.96
APC 10x5-E 4 14.8 54.46 806.1 13,297 63.0 2537 89.49 3.15
APC 10x6-E 4 14.8 59.69 883.4 12,964 73.7 2593 91.46 2.94
APC 10x7-E 4 14.8 67.40 997.6 12,401 82.2 2658 93.76 2.66
APC 10x8-E 4 14.8 73.10 1081.9 11,992 90.8 2556 90.16 2.36
APC 11x5.5-E 4 14.8 72.96 1079.7 12,013 62.6 3286 115.91 3.04
BadAss 10x5-W 4 14.8 48.14 712.5 13,937 66.0 2391 84.34 3.36
BadAss 10x6-W 4 14.8 61.20 905.7 13,002 73.9 2242 79.08 2.48
BadAss 10x7-W 4 14.8 64.90 960.5 12,715 84.3 2127 75.03 2.21
BadAss 10x8-W 4 14.8 70.43 1042.3 12,295 93.1 2270 80.07 2.18
BadAss 11x5-W 4 14.8 62.53 925.4 12,969 61.4 2958 104.34 3.20
BadAss 11x6-W 4 14.8 69.14 1023.2 12,456 70.8 3230 113.93 3.16
BadAss 11x7-W 4 14.8 70.70 1046.3 12,313 81.6 3058 107.87 2.92
GemFan 8x5-F 4 14.8 26.72 395.4 15,350 72.7 1478 52.13 3.74
GemFan 9x5-F 4 14.8 36.80 544.7 14,700 69.6 2073 73.12 3.81
GemFan 10x6-F 4 14.8 52.42 775.8 13,661 77.6 2738 96.58 3.53
MAS 8x6x3 4 14.8 39.25 580.9 14,551 82.7 2036 71.82 3.50
MAS 9x7x3 4 14.8 58.54 866.3 13,249 87.8 2816 99.33 3.25
MAS 10x5x3 4 14.8 54.01 799.4 13,549 64.2 2945 103.88 3.68
MAS 10x7x3 4 14.8 71.75 1061.8 12,235 81.1 3307 116.65 3.11
 
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 7x4-E 5 18.5 30.08 556.5 19,079 72.3 1650 58.20 2.97
APC 7x5-E 5 18.5 37.01 684.6 18,590 88.0 1658 58.48 2.42
APC 7x6-E 5 18.5 37.81 699.5 18,524 105.3 1738 61.31 2.48
APC 7x7-E 5 18.5 45.37 839.4 17,898 118.6 1689 59.58 2.01
APC 8x4-E 5 18.5 43.41 803.1 18,048 68.4 2184 77.04 2.72
APC 8x6-E 5 18.5 60.32 1116.0 16,847 95.7 2447 86.31 2.19
APC 8x8-E 5 18.5 70.61 1306.3 16,089 121.9 2317 81.73 1.77
APC 9x4.5-E 5 18.5 60.58 1120.8 16,830 71.7 3189 112.49 2.85
APC 9x6-E 5 18.5 69.14 1279.1 16,189 92.0 2885 101.76 2.26
BadAss 10x5-W 5 18.5 69.70 1289.4 16,179 76.6 3071 108.32 2.38
BadAss 10x6-W 5 18.5 87.54 1619.4 15,160 86.1 3163 111.57 1.95
MAS 7x4x3 5 18.5 28.17 521.1 19,239 72.9 1595 56.26 3.06
MAS 8x6x3 5 18.5 54.95 1016.6 17,324 98.4 2923 103.10 2.88
 
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 6.5x6.0-P 6 22.2 34.71 770.6 22,885 130.0 1448 51.08 1.88
APC 6.5x6.5-P 6 22.2 36.93 819.8 22,681 139.6 1380 48.68 1.68
APC 7x4-E 6 22.2 44.10 979.1 22,086 83.7 2250 79.37 2.30
APC 7x5-E 6 22.2 52.51 1165.7 21,435 101.5 2205 77.78 1.89
APC 7x6-E 6 22.2 53.88 1196.2 21,321 121.1 2320 81.83 1.94
APC 7x7-E 6 22.2 62.63 1390.3 20,646 136.9 2244 79.15 1.61
MAS 6x4x3 6 22.2 23.65 524.9 23,710 89.8 1448 51.08 2.76
MAS 7x4x3 6 22.2 39.08 867.7 22,539 85.4 2114 74.57 2.44
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.