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: Scale 25-size 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 Thunder Power Li-Po batteries for the best performance and lowest weight (in some cases Ni-MH 1800-2200mAh high-discharge
packs also make good alternatives at the expense of weight and lower capacity). Some examples of the packs we recommend for use with the
Power 25 motor can be found below:
THP42002S2PPL 4200mAh 2S2P 7.4V Li-Po,13GA
THP42003S2PPL 4200mAh 3S2P 11.1V Li-Po,13GA
THP60002S3PPL 6000mAh 2S3P 7.4V Li-Po,13GA
THP60003S3PPL 6000mAh 3S3P 11.1V Li-Po,13GA
THP60004S3PPL 6000mAh 4S3P 14.8V Li-Po,13GA
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.
25-size Scale 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:
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
Reversing the Shaft:
This Outrunner motor has a shaft, which exits through the rotating part of the motor. If you want to reverse the shaft to exit through the fixed part of
the motor, follow these instructions carefully for changing the shaft installation.
NOTE:
The user assumes all liability for damage that may occur.
1.
Loosen the set screw on the shaft collar and remove the collar from its location against the bearing.
2.
Remove the small black donut washer that rests against the bearing.
3.
Loosen the two set screws in the rotating part of the motor.
4.
Slide the shaft through the motor. It may be necessary to use a small hammer to lightly tap the shaft. It is very important that you do not
bend the shaft in this process so use extreme caution to assure this does not happen.
5.
Re-install the donut washer against the bearing. Do not skip this step.
6.
Re-install the shaft collar back against the washer and bearing.
7.
Retighten all setscrews making sure you line up with the flat spot on the shaft.
All manuals and user guides at all-guides.com
