Tempest 1704-2050 Performance Test Data
Magnets Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (3S)
12-Pole 16-Turn Delta 2050 RPM/Volt Io = 0.34 Amps @ 10v Rm = 0.325 Ohms 7.5 Amps 85 W
 
Stator Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
9-Slot 21.0 mm,  0.827 in. 15.8 mm,  0.622 in. 25.5 mm,  1.004 in. 2.00 mm,  0.079 in. 14.6 gm,   0.51 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 0.274 A 0.309 A 0.341 A 0.365 A 2024 RPM/Volt @ 10v 0.3253 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 4.7x4.25-E 2 7.4 3.56 26.3 11,507 46.3 116 4.10 4.41
APC 4.75x4.75-E 2 7.4 3.86 28.6 11,220 50.5 117 4.13 4.10
APC 4.75x5.5-E 2 7.4 4.32 32.0 10,758 56.0 104 3.68 3.26
APC 5x4.3-E 2 7.4 4.88 36.1 10,185 41.5 171 6.02 4.73
APC 5x4.5-E 2 7.4 4.93 36.4 10,150 43.3 170 6.01 4.67
APC 5x4.6-E 2 7.4 4.95 36.6 10,126 44.1 177 6.25 4.83
APC 5x5-E 2 7.4 4.38 32.4 10,695 50.6 111 3.92 3.42
APC 5.25x4.75-E 2 7.4 4.70 34.8 10,348 46.5 150 5.29 4.31
APC 5.25x6.25-E 2 7.4 5.65 41.8 9,375 55.5 129 4.54 3.08
APC 5.5x4.5-E 2 7.4 4.76 35.2 10,294 43.9 160 5.63 4.54
APC 6x4-E 2 7.4 5.13 38.0 9,886 37.4 191 6.72 5.02
APC 6x4.3-E 2 7.4 6.26 46.3 8,698 35.4 234 8.26 5.05
APC 6x4.5-E 2 7.4 6.20 45.9 8,797 37.5 239 8.41 5.20
APC 6x5.5-E 2 7.4 6.18 45.7 8,766 45.7 167 5.89 3.65
APC 6x6-E 2 7.4 6.38 47.2 8,515 48.4 176 6.22 3.74
APC 7x4-E 2 7.4 6.60 48.8 8,245 31.2 263 9.28 5.39
APC 7x4-SF 2 7.4 6.61 48.9 8,224 31.2 257 9.06 5.26
APC 7x5-E 2 7.4 7.35 54.4 7,263 34.4 223 7.87 4.10
APC 7x5-SF 2 7.4 7.17 53.1 7,502 35.5 244 8.62 4.60
APC 7x6-E 2 7.4 7.56 56.0 6,946 39.5 225 7.92 4.01
APC 7x6-SF 2 7.4 7.70 57.0 6,810 38.7 216 7.61 3.79
HQ 5x4.5-BN 2 7.4 4.85 35.9 10,214 43.5 191 6.73 5.32
HQ 5x4.5-C 2 7.4 3.31 24.5 11,760 50.1 161 5.68 6.58
HQ 6x3-C 2 7.4 3.33 24.6 11,844 33.6 174 6.14 7.08
HQ 6x4.5-C 2 7.4 5.51 40.7 9,518 40.6 227 8.02 5.58
 
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 4.7x4.25-E 3 11.1 6.26 69.4 15,401 62.0 211 7.44 3.04
APC 4.75x4.75-E 3 11.1 6.68 74.1 14,875 66.9 204 7.19 2.75
APC 4.75x5.5-E 3 11.1 7.23 80.3 14,076 73.3 176 6.19 2.19
APC 5x5-E 3 11.1 7.37 81.8 13,890 65.8 191 6.73 2.33
APC 5.25x4.75-E 3 11.1 7.69 85.4 13,421 60.4 255 8.99 2.99
APC 5.5x4.5-E 3 11.1 7.81 86.7 13,154 56.1 262 9.24 3.02
HQ 4x4-C 3 11.1 4.79 53.1 17,002 64.4 215 7.57 4.04
HQ 4x4.5-BN 3 11.1 5.87 65.1 15,845 67.5 239 8.43 3.67
HQ 4x4.5-C 3 11.1 3.20 35.5 18,806 80.1 165 5.83 4.66
HQ 5x3-C 3 11.1 4.15 46.0 17,772 50.5 255 8.98 5.53
HQ 5x4-C 3 11.1 5.66 62.8 16,069 60.9 298 10.51 4.74
HQ 5x4.5-BN 3 11.1 7.86 87.2 13,068 55.7 309 10.88 3.54
HQ 5x4.5-C 3 11.1 5.78 64.2 15,900 67.8 295 10.41 4.60
HQ 6x3-C 3 11.1 5.64 62.5 16,050 45.6 324 11.43 5.18
HQ 6x4.5-C 3 11.1 8.57 95.1 11,818 50.4 358 12.62 3.76
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)
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.