E-flite Power 25 Brushless Outrunner Motor, 870Kv - Manual (Page 2)

Average Voltage (depending on cell count) x Max Burst Current = Burst Input Watts
HINT: The typical average voltage under load of a Ni-Cd/Ni-MH cell is 1.0 volt. The typical average voltage under load of a Li-Po cell is 3.3 volts. This means
the typical average voltage under load of a 10 cell Ni-MH pack is approximately 10 volts and a 3 cell Li-Po pack is approximately 9.9 volts. Due to variations in
the performance of a given battery, the average voltage under load may be higher or lower. These however are good starting points for initial calculations.
Model: E-flite J-3 Cub 25e ARF
Estimated Flying Weight w/Battery: 4.0 lbs
Total Input Watts Required for Desired Performance: 280 (minimum)
Motor: Power 25
Max Continuous Current: 32A*
Max Burst Current: 44A*
Cells (Li-Po): 3
3 Cells, Continuous Power Capability: 9.9 Volts (3 x 3.3) x 32 Amps = 316 Watts
3 Cells, Max Burst Power Capability: 9.9 Volts (3 x 3.3) x 44 Amps = 435 Watts
Per this example, the Power 25 motor (when using a 3S Li-Po pack) can deliver up to 435 watts of input power, readily capable of powering a scale 25-size
electric ARF with the desired level of performance (requiring 280 watts minimum). You must however be sure that the battery chosen for power can adequately
supply the current requirements of the system for the required performance.
Battery Choices:
We recommend either E-flite or Thunder Power batteries and list some possible choices for the Power 25 Brushless Outrunner motor, all depending on the
airplane application. Battery technology is constantly changing and manufacturers are improving and updating older packs with new ones so the list below may
generally have new substitutions.
THP33003SP30
3300mAh 3-Cell/3S 11.1V Pro Power 30C Li-Po EFLB32003S 3200mAh 3S 11.1V 20C Li-Po, 13 AWG
THP33004SP30 3300mAh 4-Cell/4S 14.8V Pro Power 30C Li-Po EFLB32004S 3200mAh 4S 14.8V 20C Li-Po, 13 AWG
THP38503SP30 3850mAh 3-Cell/3S 11.1V Pro Power 30C Li-Po
THP38504SP30 3850mAh 4-Cell/4S 14.8V Pro Power 30C Li-Po
Examples of Airplane Setups:
Please see our web site for the most up-to-date information and airplane setup examples.
NOTE: All data measured at full throttle. Actual performance may vary depending on battery and flight conditions.
E-flite J-3 Cub 25e ARF
Option 1:
Motor: Power 25
ESC: E-flite 40A Brushless (V2) (EFLA312B)
Prop: APC 12x8E (APC12080E)
Battery: Thunder Power PRO LITE 4200mAh 3S2P (THP420003S2PPL)
Flying Weight w/Battery: 4.0 lbs
Amps
Volts Watts Input Watts/Pound RPM
36.8 10.8 397 99 7410
Expect very strong performance providing plenty of power for full aerobatics. Average duration is approximately 12-15 minutes depending on throttle
management.
Option 2:
Motor: Power 25
ESC: E-flite 40A Brushless (V2) (EFLA312B)
Prop: APC 12x8E (APC12080E)
Battery: KAN 1800mAh 4/5A 10-Cells
Flying Weight w/Battery: 4.15 lbs
Amps
Volts Watts Input Watts/Pound RPM
29.6 9.8 290 70 6780
Expect good flight performance with ability to do rolls and loops. Scale flight at half throttle was smooth and responsive. Average duration is approximately 5-7
minutes depending on throttle management.
Accessories and Spare Parts:
See our web site at www.E-fliteRC.com or www.horizonhobby.com for our complete line of brushless motors. We have posted a specification comparison sheet
on our web site so you can compare the different motors we offer.
EFLA110
Power Meter (measures power output in amps, volts, watts, and capacity)
EFLA241 Gold Bullet Connector Set, 3.5mm (3)
EFLM1925 Prop Adapter w/ Collet, 5mm
EFLM40102 X-Mount/Hardware: Power 10/15/25
EFLM40251 Shaft: Power 25 BL Outrunner
EFLA1040L 40A Lite Pro SB Brushless ESC
EFLA1040 40A Pro SB Brushless ESC
EFLA1060 60A Pro SB Brushless ESC
Operating Instructions:
1. This brushless motor requires the use of a sensorless brushless speed control. Failure to use the correct speed control may result in damage to the
motor and/or speed control. Please be sure the timing and PWM switching frequency is set properly on your controller.
2. When mounting the motor, be sure the correct length of screws are used so damage to the inside of the motor will not occur. We suggest you use the
mounting hardware included with your motor. The use of long screws will damage the motor.
3. You may connect the three motor wires directly to the controller with solder or use connectors such as gold plated brushless bullet connectors
(EFLA241), which will also need to be soldered properly to your wires. The three motor wires can be connected in any order to the three output wires