Tempest 2808-1150 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (4S)
14-Pole 26-Turn Delta 1150 RPM/Volt Io = 1.11 Amps @ 10v Rm = 0.084 Ohms 24 Amps 355 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. 78.4 gm,   2.77 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 0.966 A 1.108 A 1.270 A 1.363 A 1206 RPM/Volt @ 10v 0.0838 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 7x6-E 3 11.1 10.76 119.4 10,870 61.8 567 20.00 4.75
APC 7x6-F 3 11.1 10.92 121.2 11,677 66.3 407 14.36 3.36
APC 7x7-E 3 11.1 12.90 143.2 10,524 69.8 561 19.79 3.92
APC 8x4-E 3 11.1 11.86 131.6 10,713 40.6 710 25.04 5.39
APC 8x4-F 3 11.1 10.76 119.4 11,721 44.4 575 20.28 4.82
APC 8x6-E 3 11.1 16.08 178.5 9,963 56.6 794 28.01 4.45
APC 8x8-E 3 11.1 21.95 243.6 9,521 72.1 762 26.88 3.13
APC 9x4.5-E 3 11.1 18.60 206.5 10,239 43.6 1015 35.80 4.92
APC 9x5-F 3 11.1 16.65 184.8 10,678 50.6 873 30.79 4.72
APC 9x6-E 3 11.1 20.95 232.5 9,759 55.4 999 35.24 4.30
APC 10x5-E 3 11.1 23.35 259.2 9,182 43.5 1166 41.13 4.50
APC 10x6-E 3 11.1 25.32 281.1 8,945 50.8 1219 43.00 4.34
APC 10x6-F 3 11.1 22.31 247.7 9,461 53.8 1112 39.22 4.49
BadAss 10x5-W 3 11.1 22.33 247.8 9,492 44.9 1079 38.06 4.35
BadAss 10x6-W 3 11.1 26.31 292.1 8,438 47.9 945 33.33 3.24
GemFan 7x6-F 3 11.1 15.42 171.1 10,950 62.2 472 16.65 2.76
GemFan 7.5x4-F 3 11.1 20.22 224.5 9,946 37.7 635 22.40 2.83
GemFan 8x5-F 3 11.1 14.55 161.5 11,104 52.6 763 26.91 4.73
GemFan 9x5-F 3 11.1 18.63 206.8 10,305 48.8 1001 35.31 4.84
MAS 7x4x3 3 11.1 11.00 122.1 11,753 44.5 548 19.33 4.49
MAS 8x6x3 3 11.1 19.27 213.9 10,163 57.7 923 32.56 4.32
 
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 6x4.5-E 4 14.8 10.74 158.9 14,919 63.6 673 23.74 4.24
APC 6x6-E 4 14.8 10.98 162.5 14,870 84.5 533 18.80 3.28
APC 7x4-E 4 14.8 13.71 202.9 14,355 54.4 875 30.86 4.31
APC 7x4-F 4 14.8 11.88 175.8 15,586 59.0 585 20.63 3.33
APC 7x5-E 4 14.8 16.67 246.7 13,795 65.3 852 30.05 3.45
APC 7x6-E 4 14.8 17.42 257.8 13,664 77.6 928 32.73 3.60
APC 7x6-F 4 14.8 16.62 246.0 14,678 83.4 664 23.42 2.70
APC 7x7-E 4 14.8 20.54 304.0 13,065 86.6 879 31.01 2.89
APC 8x4-E 4 14.8 19.25 284.8 13,304 50.4 1146 40.42 4.02
APC 8x4-F 4 14.8 16.64 246.3 14,685 55.6 942 33.23 3.83
APC 8x6-E 4 14.8 24.95 369.2 12,063 68.5 1197 42.22 3.24
APC 9x4.5-E 4 14.8 27.65 409.2 12,174 51.9 1521 53.65 3.72
APC 9x5-F 4 14.8 24.45 361.8 12,944 61.3 1330 46.91 3.68
GemFan 7x6-F 4 14.8 22.04 326.2 13,544 77.0 743 26.21 2.28
GemFan 8x5-F 4 14.8 21.11 312.4 13,768 65.2 1168 41.20 3.74
MAS 7x4x3 4 14.8 16.36 242.1 14,773 56.0 915 32.28 3.78
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.