Tempest 2814-850 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 20-Turn Delta 850 RPM/Volt Io = 1.39 Amps @ 10v Rm = 0.061 Ohms 32 Amps 475 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
12-Slot 35.4 mm,  1.394 in. 32.4 mm,  1.276 in. 54.8 mm,  2.157 in. 5.00 mm,  0.197 in. 107 gm,   3.77 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 1.359 A 1.387 A 1.533 A 1.657 A 844 RPM/Volt @ 10v 0.0608 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 9x5-F 3 11.1 10.95 121.5 9,541 45.2 692 24.41 5.69
APC 9x6-E 3 11.1 14.65 162.7 9,100 51.7 868 30.62 5.34
APC 9x7.5-E 3 11.1 21.19 235.2 8,421 59.8 894 31.53 3.80
APC 9x9-E 3 11.1 24.41 270.9 8,084 68.9 854 30.12 3.15
APC 10x5-E 3 11.1 17.14 190.3 8,808 41.7 1070 37.74 5.62
APC 10x6-E 3 11.1 19.16 212.7 8,630 49.0 1132 39.93 5.32
APC 10x6-F 3 11.1 16.11 178.8 9,036 51.3 985 34.74 5.51
APC 10x7-E 3 11.1 21.97 243.9 8,341 55.3 1142 40.28 4.68
APC 10x8-E 3 11.1 24.26 269.3 8,083 61.2 1120 39.51 4.16
APC 10x10-E 3 11.1 30.26 335.9 7,372 69.8 915 32.28 2.72
APC 11x5.5-E 3 11.1 23.77 263.9 8,243 42.9 1415 49.91 5.36
APC 11x7-E 3 11.1 27.06 300.4 7,858 52.1 1443 50.90 4.80
APC 11x8-E 3 11.1 28.80 319.7 7,648 57.9 1402 49.45 4.39
APC 11x8-F 3 11.1 25.45 282.5 8,044 60.9 1373 48.43 4.86
APC 11x8.5-E 3 11.1 30.43 337.8 7,438 59.9 1374 48.47 4.07
APC 11x10-E 3 11.1 34.33 381.0 6,939 65.7 1128 39.79 2.96
APC 12x6-E 3 11.1 29.01 322.1 7,601 43.2 1638 57.78 5.09
APC 12x8-E 3 11.1 34.54 383.3 7,184 54.4 1451 51.18 3.79
APC 12x8.5-F 3 11.1 30.44 337.9 7,442 59.9 1602 56.51 4.74
APC 13x4-E 3 11.1 26.09 289.6 7,950 30.1 1684 59.40 5.81
APC 13x5.5-E 3 11.1 30.87 342.6 7,367 38.4 1793 63.25 5.23
APC 13x6.5-E 3 11.1 36.92 409.9 6,893 42.4 1858 65.54 4.53
APC 13x7-F 3 11.1 32.58 361.6 7,174 47.6 1792 63.21 4.96
BadAss 10x5-W 3 11.1 16.06 178.2 8,955 42.4 963 33.97 5.40
BadAss 10x6-W 3 11.1 20.42 226.7 8,500 48.3 988 34.85 4.36
BadAss 10x7-W 3 11.1 22.30 247.6 8,311 55.1 889 31.36 3.59
BadAss 10x8-W 3 11.1 24.63 273.4 8,035 60.9 967 34.11 3.54
BadAss 11x5-W 3 11.1 20.62 228.9 8,580 40.6 1205 42.50 5.26
BadAss 11x6-W 3 11.1 23.64 262.4 8,241 46.8 1332 46.98 5.08
BadAss 11x7-W 3 11.1 23.93 265.6 8,205 54.4 1324 46.70 4.98
BadAss 11x8-W 3 11.1 29.24 324.5 7,594 57.5 1117 39.40 3.44
BadAss 12x6-W 3 11.1 27.58 306.2 7,791 44.3 1500 52.91 4.90
BadAss 12x7-W 3 11.1 31.07 344.9 7,329 48.6 1574 55.52 4.56
BadAss 12x8-W 3 11.1 34.81 386.4 6,794 51.5 1209 42.65 3.13
BadAss 13x6-W 3 11.1 31.30 347.4 7,292 41.4 1706 60.18 4.91
BadAss 13x8-W 3 11.1 39.00 432.8 6,700 50.8 1683 59.37 3.89
GemFan 9x5-F 3 11.1 12.45 138.2 9,346 44.3 809 28.54 5.85
GemFan 10x6-F 3 11.1 17.86 198.2 8,860 50.3 1099 38.77 5.54
GemFan 11x8-F 3 11.1 29.28 325.0 7,601 57.6 1266 44.66 3.90
GemFan 12x8-F 3 11.1 33.65 373.5 7,009 53.1 1442 50.86 3.86
MAS 8x6x3 3 11.1 13.35 148.2 9,307 52.9 737 26.00 4.97
MAS 9x7x3 3 11.1 20.11 223.2 8,631 57.2 1096 38.66 4.91
MAS 10x5x3 3 11.1 18.35 203.7 8,818 41.8 1138 40.14 5.59
MAS 10x7x3 3 11.1 25.16 279.2 8,082 53.6 1349 47.58 4.83
MAS 11x7x3 3 11.1 29.08 322.7 7,615 50.5 1519 53.58 4.71
MAS 11x8x3 3 11.1 30.75 341.3 7,377 55.9 1529 53.93 4.48
MAS 12x6x3 3 11.1 31.36 348.1 7,300 41.5 1659 58.52 4.77
 
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 8x4-E 4 14.8 14.11 208.8 12,385 46.9 985 34.74 4.72
APC 8x6-E 4 14.8 20.01 296.1 11,529 65.5 1157 40.81 3.91
APC 8x8-E 4 14.8 24.45 361.8 11,261 85.3 1084 38.24 3.00
APC 9x4.5-E 4 14.8 20.12 297.8 11,739 50.0 1403 49.49 4.71
APC 9x5-F 4 14.8 17.23 255.0 12,130 57.4 1171 41.31 4.59
APC 9x6-E 4 14.8 23.53 348.2 11,434 65.0 1395 49.21 4.01
APC 9x7.5-E 4 14.8 33.34 493.4 10,201 72.5 1352 47.69 2.74
APC 9x9-E 4 14.8 35.95 532.1 9,812 83.6 1290 45.50 2.42
APC 10x5-E 4 14.8 27.30 404.0 10,955 51.9 1723 60.78 4.27
APC 10x6-E 4 14.8 29.77 440.7 10,648 60.5 1733 61.13 3.93
APC 10x6-F 4 14.8 24.71 365.6 11,295 64.2 1583 55.84 4.33
APC 10x7-E 4 14.8 33.58 497.0 10,122 67.1 1707 60.21 3.43
BadAss 10x5-W 4 14.8 27.75 410.8 11,284 53.4 1541 54.36 3.75
BadAss 10x6-W 4 14.8 31.47 465.8 10,452 59.4 1438 50.72 3.09
BadAss 10x7-W 4 14.8 33.19 491.2 10,164 67.4 1344 47.41 2.74
BadAss 11x5-W 4 14.8 30.95 458.0 10,505 49.7 1841 64.94 4.02
BadAss 11x6-W 4 14.8 34.37 508.6 9,975 56.7 1981 69.88 3.89
GemFan 7x6-F 4 14.8 15.22 225.3 12,345 70.1 606 21.38 2.69
GemFan 7.5x4-F 4 14.8 21.43 317.1 11,672 44.2 910 32.10 2.87
GemFan 8x5-F 4 14.8 14.25 210.9 12,447 58.9 955 33.69 4.53
GemFan 9x5-F 4 14.8 19.37 286.6 11,899 56.3 1327 46.81 4.63
GemFan 10x6-F 4 14.8 26.87 397.7 11,042 62.7 1710 60.32 4.30
MAS 8x6x3 4 14.8 20.31 300.6 11,804 67.1 1262 44.51 4.20
MAS 9x7x3 4 14.8 30.02 444.3 10,651 70.6 1713 60.42 3.86
MAS 10x5x3 4 14.8 27.70 409.9 10,949 51.8 1804 63.63 4.40
MAS 10x7x3 4 14.8 37.40 553.5 9,977 66.1 2072 73.09 3.74
 
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 14.21 262.8 15,585 59.0 1066 37.60 4.06
APC 7x5-E 5 18.5 17.65 326.6 15,195 71.9 1051 37.07 3.22
APC 7x6-E 5 18.5 18.39 340.3 15,110 85.9 1156 40.78 3.40
APC 7x7-E 5 18.5 22.41 414.5 14,652 97.1 1108 39.08 2.67
APC 8x4-E 5 18.5 20.84 385.5 14,832 56.2 1447 51.04 3.75
APC 8x6-E 5 18.5 28.91 534.9 13,869 78.8 1627 57.39 3.04
APC 8x8-E 5 18.5 34.17 632.1 13,163 99.7 1490 52.56 2.36
APC 9x4.5-E 5 18.5 29.00 536.5 13,855 59.0 2037 71.85 3.80
APC 9x6-E 5 18.5 33.01 610.8 13,318 75.7 1887 66.56 3.09
GemFan 7x6-F 5 18.5 20.54 380.0 14,859 84.4 889 31.36 2.34
GemFan 7.5x4-F 5 18.5 28.07 519.4 13,945 52.8 1480 52.20 2.85
GemFan 8x5-F 5 18.5 19.53 361.4 14,980 70.9 1376 48.54 3.81
GemFan 9x5-F 5 18.5 26.41 488.5 14,144 67.0 1876 66.17 3.84
MAS 7x4x3 5 18.5 14.51 268.3 15,543 58.9 1004 35.41 3.74
MAS 8x6x3 5 18.5 28.03 518.6 13,981 79.4 1807 63.74 3.48
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
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.