Tempest 2808-1860 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 16-Turn Delta 1860 RPM/Volt Io = 2.71 Amps @ 10v Rm = 0.041 Ohms 36 Amps 530 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 35.4 mm,  1.394 in. 26.3 mm,  1.035 in. 48.8 mm,  1.921 in. 5.00 mm,  0.197 in. 77.6 gm,   2.74 oz
 
Test Data From Input 6.0 V 8.0 V 10.0V 12.0V Measured Kv value Measured Rm Value
Sample Motor Io Value 1.803 A 2.186 A 2.707 A 2.902 A 1829 RPM/Volt @ 10v 0.0408 Ohms
 
2-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 2 7.4 15.81 117.0 12,030 45.6 592 20.88 5.06
APC 7x5-E 2 7.4 19.21 142.2 11,550 54.7 577 20.35 4.06
APC 7x6-E 2 7.4 20.17 149.2 11,427 64.9 631 22.26 4.23
APC 7x6-F 2 7.4 17.45 129.1 11,800 67.0 419 14.78 3.25
APC 7x7-E 2 7.4 23.67 175.2 10,915 72.4 610 21.52 3.48
APC 8x4-E 2 7.4 22.49 166.5 11,252 42.6 799 28.18 4.80
APC 8x4-F 2 7.4 17.40 128.7 11,810 44.7 594 20.95 4.61
APC 8x6-E 2 7.4 28.97 214.4 10,266 58.3 848 29.91 3.96
APC 8x8-E 2 7.4 33.56 248.4 9,476 71.8 743 26.21 2.99
APC 9x4.5-E 2 7.4 29.27 216.6 10,204 43.5 1020 35.98 4.71
APC 9x5-F 2 7.4 25.84 191.2 10,577 50.1 863 30.44 4.51
APC 9x6-E 2 7.4 32.37 239.5 9,678 55.0 978 34.50 4.08
APC 10x5-E 2 7.4 35.62 263.6 9,096 43.1 1122 39.58 4.26
APC 10x6-E 2 7.4 39.21 290.2 8,778 49.9 1166 41.13 4.02
APC 10x6-F 2 7.4 34.02 251.8 9,357 53.2 1051 37.07 4.17
GemFan 7x6-F 2 7.4 23.94 177.2 10,864 61.7 464 16.37 2.62
GemFan 7.5x4-F 2 7.4 30.84 228.2 9,761 37.0 606 21.38 2.66
GemFan 8x5-F 2 7.4 22.57 167.0 11,066 52.4 758 26.74 4.54
GemFan 9x5-F 2 7.4 28.87 213.7 10,249 48.5 976 34.43 4.57
GemFan 10x6-F 2 7.4 36.25 268.3 8,984 51.0 1120 39.51 4.17
MAS 7x4x3 2 7.4 17.39 128.7 11,807 44.7 559 19.72 4.34
MAS 8x6x3 2 7.4 30.07 222.5 10,068 57.2 890 31.39 4.00
 
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 6x3-F 3 11.1 15.07 167.3 18,430 52.4 514 18.13 3.07
APC 6x4-E 3 11.1 17.54 194.7 18,049 68.4 669 23.60 3.44
APC 6x4.3-E 3 11.1 24.20 268.6 17,208 70.1 904 31.89 3.37
APC 6x4.5-E 3 11.1 23.13 256.7 17,375 74.0 915 32.28 3.56
APC 6x5.5-E 3 11.1 21.22 235.5 17,501 91.2 713 25.15 3.03
APC 6x6-E 3 11.1 24.03 266.8 17,076 97.0 700 24.69 2.62
APC 6.5x5.0-P 3 11.1 23.17 257.2 17,361 82.2 751 26.49 2.92
APC 6.5x5.5-P 3 11.1 24.43 271.2 17,171 89.4 752 26.53 2.77
APC 6.5x6.0-P 3 11.1 27.20 302.0 16,722 95.0 721 25.43 2.39
APC 6.5x6.5-P 3 11.1 29.41 326.4 16,380 100.8 659 23.25 2.02
APC 7x4-E 3 11.1 30.10 334.1 16,284 61.7 1175 41.45 3.52
APC 7x4-F 3 11.1 22.35 248.1 17,339 65.7 734 25.89 2.96
APC 7x5-E 3 11.1 35.37 392.6 15,386 72.9 1081 38.13 2.75
APC 7x6-E 3 11.1 36.37 403.7 15,233 86.6 1172 41.34 2.90
APC 7x6-F 3 11.1 30.78 341.6 16,155 91.8 809 28.54 2.37
GemFan 7x6-F 3 11.1 39.08 433.7 14,648 83.2 860 30.34 1.98
GemFan 8x5-F 3 11.1 37.63 417.6 14,902 70.6 1354 47.76 3.24
MAS 6x4x3 3 11.1 19.59 217.5 17,759 67.3 794 28.01 3.65
MAS 7x4x3 3 11.1 30.13 334.4 16,266 61.6 1101 38.84 3.29
 
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 5x4.3-E 4 14.8 24.02 355.6 23,169 94.3 865 30.51 2.43
APC 5x4.5-E 4 14.8 25.04 370.6 23,020 98.1 876 30.90 2.36
APC 5x4.6-E 4 14.8 24.89 368.4 23,043 100.4 922 32.52 2.50
APC 6x4-E 4 14.8 28.22 417.6 22,523 85.3 1031 36.37 2.47
APC 6x4.3-E 4 14.8 36.22 536.1 21,160 86.2 1401 49.42 2.61
APC 6x4.5-E 4 14.8 34.12 505.0 21,520 91.7 1399 49.35 2.77
APC 6x5.5-E 4 14.8 33.15 490.7 21,703 113.0 1086 38.31 2.21
APC 6x6-E 4 14.8 37.12 549.4 20,979 119.2 1062 37.46 1.93
APC 6.5x5.0-P 4 14.8 35.15 520.2 21,353 101.1 1140 40.21 2.19
APC 6.5x5.5-P 4 14.8 36.91 546.3 21,028 109.5 1152 40.63 2.11
MAS 6x4x3 4 14.8 29.39 434.9 22,348 84.7 1251 44.13 2.88
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.