Tempest 2820-1170 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 10-Turn Delta 1170 RPM/Volt Io = 2.85 Amps @ 10v Rm = 0.027 Ohms 60 Amps 890 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 35.4 mm,  1.394 in. 38.4 mm,  1.512 in. 60.8 mm,  2.394 in. 5.00 mm,  0.197 in. 135 gm,   4.76 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 2.663 A 2.854 A 2.977 A 3.157 A 1161RPM/Volt @ 10v 0.0269 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 8x6-E 3 11.1 25.34 281.2 11,650 66.2 1130 39.86 4.02
APC 8x8-E 3 11.1 31.27 347.1 11,191 84.8 1085 38.27 3.13
APC 9x5-F 3 11.1 21.49 238.6 11,914 56.4 1123 39.61 4.71
APC 9x6-E 3 11.1 29.70 329.7 11,266 64.0 1371 48.36 4.16
APC 9x7.5-E 3 11.1 43.43 482.1 10,188 72.4 1372 48.40 2.85
APC 9x8x3-E 3 11.1 43.12 478.6 10,198 77.3 1800 63.49 3.76
APC 9x9-E 3 11.1 46.97 521.4 9,883 84.2 1321 46.60 2.53
APC 10x5-E 3 11.1 33.24 368.9 10,697 50.6 1645 58.03 4.46
APC 10x6-E 3 11.1 38.04 422.3 10,550 59.9 1724 60.81 4.08
APC 10x6-F 3 11.1 31.22 346.5 11,195 63.6 1556 54.89 4.49
APC 10x7-E 3 11.1 43.45 482.3 10,125 67.1 1735 61.20 3.60
APC 10x8-E 3 11.1 47.43 526.5 9,794 74.2 1693 59.72 3.22
APC 10x10-E 3 11.1 57.48 638.1 8,978 85.0 1392 49.10 2.18
APC 11x5.5-E 3 11.1 46.47 515.9 9,886 51.5 2164 76.33 4.20
APC 11x7-E 3 11.1 52.74 585.5 9,436 62.5 2178 76.83 3.72
APC 11x7x3-E 3 11.1 52.02 577.4 9,487 62.9 2351 82.93 4.07
APC 11x8-E 3 11.1 55.81 619.5 9,157 69.4 2085 73.54 3.37
APC 11x8-F 3 11.1 48.70 540.6 9,841 74.6 2115 74.60 3.91
APC 11x8.5-E 3 11.1 58.82 652.9 8,863 71.3 1997 70.44 3.06
APC 11x10-E 3 11.1 66.65 739.8 8,655 82.0 1798 63.42 2.43
APC 12x6-E 3 11.1 56.69 629.3 9,069 51.5 2478 87.41 3.94
APC 12x8-E 3 11.1 66.41 737.2 8,596 65.1 2147 75.73 2.91
APC 12x8.5-F 3 11.1 58.05 644.3 9,043 72.8 2440 86.07 3.79
APC 13x4-E 3 11.1 50.63 562.0 9,585 36.3 2578 90.94 4.59
APC 13x5.5-E 3 11.1 60.45 671.0 9,038 47.1 2781 98.10 4.14
BadAss 10x5-W 3 11.1 31.33 347.8 11,194 53.0 1523 53.72 4.38
BadAss 10x6-W 3 11.1 40.49 449.4 10,447 59.4 1456 51.36 3.24
BadAss 10x7-W 3 11.1 43.09 478.3 10,267 68.1 1378 48.61 2.88
BadAss 10x8-W 3 11.1 47.14 523.3 9,969 75.5 1487 52.45 2.84
BadAss 11x5-W 3 11.1 39.71 440.8 10,555 50.0 1869 65.93 4.24
BadAss 11x6-W 3 11.1 44.99 499.3 10,154 57.7 2051 72.35 4.11
BadAss 11x7-W 3 11.1 45.59 506.0 10,095 66.9 2029 71.57 4.01
BadAss 11x8-W 3 11.1 55.54 616.5 9,292 70.4 1665 58.73 2.70
BadAss 12x6-W 3 11.1 52.33 580.9 9,534 54.2 2246 79.22 3.87
BadAss 12x7-W 3 11.1 59.45 659.9 8,960 59.4 2260 79.72 3.42
BadAss 12x8-W 3 11.1 69.73 773.9 8,625 65.3 1938 68.36 2.50
BadAss 13x6-W 3 11.1 59.25 657.7 8,928 50.7 2580 91.01 3.92
GemFan 9x5-F 3 11.1 24.28 269.5 11,734 55.6 1291 45.54 4.79
GemFan 10x6-F 3 11.1 33.88 376.1 10,992 62.5 1694 59.75 4.50
GemFan 11x8-F 3 11.1 56.67 629.0 9,179 69.5 1886 66.53 3.00
GemFan 12x8-F 3 11.1 68.19 756.9 8,638 65.4 2236 78.87 2.95
MAS 8x6x3 3 11.1 25.62 284.4 11,640 66.1 1241 43.77 4.36
MAS 9x7x3 3 11.1 38.28 425.0 10,654 70.6 1704 60.11 4.01
MAS 10x5x3 3 11.1 35.34 392.3 10,881 51.5 1790 63.14 4.56
MAS 10x7x3 3 11.1 47.64 528.8 9,892 65.6 2074 73.16 3.92
MAS 11x7x3 3 11.1 54.87 609.1 9,325 61.8 2312 81.55 3.80
MAS 11x8x3 3 11.1 60.42 670.7 9,308 70.5 2434 85.86 3.63
 
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 7x6-E 4 14.8 26.42 391.0 15,695 89.2 1243 43.85 3.18
APC 7x7-E 4 14.8 32.55 481.7 15,219 100.9 1218 42.96 2.53
APC 8x4-E 4 14.8 30.44 450.6 15,400 58.3 1579 55.70 3.50
APC 8x6-E 4 14.8 42.12 623.3 14,444 82.1 1790 63.14 2.87
APC 8x8-E 4 14.8 49.99 739.8 13,764 104.3 1686 59.47 2.28
APC 9x4.5-E 4 14.8 42.30 626.0 14,425 61.5 2269 80.04 3.62
APC 9x6-E 4 14.8 47.91 709.1 13,891 78.9 2103 74.18 2.97
APC 9x7.5-E 4 14.8 68.93 1020.1 12,443 88.4 2036 71.82 2.00
APC 9x8x3-E 4 14.8 66.14 978.9 12,572 95.2 2759 97.32 2.82
APC 10x5-E 4 14.8 54.75 810.3 13,121 62.1 2464 86.91 3.04
APC 10x6-E 4 14.8 59.35 878.4 12,770 72.6 2456 86.63 2.80
APC 10x7-E 4 14.8 68.22 1009.6 12,375 82.0 2599 91.68 2.57
BadAss 10x5-W 4 14.8 48.63 719.8 13,874 65.7 2334 82.33 3.24
BadAss 10x6-W 4 14.8 60.35 893.1 12,793 72.7 2138 75.41 2.39
BadAss 11x5-W 4 14.8 60.26 891.9 12,786 60.5 2779 98.02 3.12
GemFan 9x5-F 4 14.8 37.25 551.4 14,835 70.2 2059 72.63 3.73
GemFan 10x6-F 4 14.8 52.18 772.2 13,549 77.0 2641 93.16 3.42
MAS 8x6x3 4 14.8 39.98 591.6 14,624 83.1 2007 70.79 3.39
MAS 9x7x3 4 14.8 57.41 849.6 13,056 86.5 2631 92.80 3.10
MAS 10x5x3 4 14.8 53.69 794.6 13,407 63.5 2799 98.73 3.52
MAS 10x7x3 4 14.8 71.82 1062.9 12,200 80.9 3156 111.32 2.97
 
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 6.5x6.5-P 5 18.5 28.28 523.1 19,700 121.3 1047 36.93 2.00
APC 7x4-E 5 18.5 32.08 593.5 19,364 73.3 1715 60.49 2.89
APC 7x5-E 5 18.5 38.48 711.8 18,796 89.0 1670 58.91 2.35
APC 7x6-E 5 18.5 39.68 734.1 18,684 106.2 1775 62.61 2.42
APC 7x7-E 5 18.5 47.39 876.7 18,009 119.4 1693 59.72 1.93
APC 8x4-E 5 18.5 45.35 839.0 18,188 68.9 2197 77.50 2.62
APC 8x6-E 5 18.5 61.54 1138.4 16,664 94.7 2402 84.73 2.11
APC 9x4.5-E 5 18.5 61.20 1132.2 16,674 71.1 3121 110.09 2.76
MAS 7x4x3 5 18.5 29.12 538.6 19,637 74.4 1614 56.93 3.00
MAS 8x6x3 5 18.5 55.36 1024.2 17,273 98.1 2807 99.01 2.74
 
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 6x4.5-E 6 22.2 29.37 652.0 23,854 101.7 1758 62.01 2.70
APC 6x5.5-E 6 22.2 28.56 634.1 23,910 124.5 1309 46.17 2.06
APC 6x6-E 6 22.2 32.55 722.7 23,585 134.0 1353 47.73 1.87
APC 6.5x5.0-P 6 22.2 30.90 686.0 23,712 112.3 1438 50.72 2.10
APC 6.5x5.5-P 6 22.2 33.00 732.6 23,560 122.7 1458 51.43 1.99
APC 6.5x6.0-P 6 22.2 36.61 812.8 23,228 132.0 1465 51.68 1.80
APC 6.5x6.5-P 6 22.2 38.66 858.2 23,022 141.7 1410 49.74 1.64
APC 7x4-E 6 22.2 46.18 1025.2 22,229 84.2 2269 80.04 2.21
APC 7x5-E 6 22.2 54.01 1199.0 21,478 101.7 2191 77.28 1.83
APC 7x6-E 6 22.2 55.42 1230.4 21,345 121.3 2302 81.20 1.87
APC 7x7-E 6 22.2 65.05 1444.1 20,754 137.6 2226 78.52 1.54
MAS 7x4x3 6 22.2 40.49 898.8 22,850 86.6 2101 74.11 2.34
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.