E-flite Power 15 User Manual
Power 15 Brushless Outrunner Instructions
Thank you for purchasing the E-flite Power 15 Brushless Outrunner motor. The Power 15 is designed to deliver clean and qui et po wer for
15-size sport and scale airplanes weighing 36- to 56-ounces (1020- to 1590-grams), 3D airplanes 32- to 40-ounces (910- to 1135-gram),
or models requiring up to 425 watts of power.
Power 15 Brushless Outrunner Features:
• Equivalent to a 15-size glow engine for sport and scale airplanes weighing 36- to 56-ounces (1020- to 1590-grams)
• Ideal for size 3D airplanes 32- to 40-ounces (910- to 1135-gram)
• Ideal for models requiring up to 575 watts of power
• High torque, direct drive alternative to inrunner brushless motors
• Includes mount, prop adapters, and mounting hardware
• Quiet, lightweight operation
• External rotor design, 5mm shaft can easily be reversed for alternative mo tor installations
• High quality construction with ball bearings and hardened steel shaft
• Slotted 14-pole outrunner design
Power 15 Specifications
Diameter: 35mm (1.4 in)
Case Length: 48mm (1.9 in)
Weight: 152g (5.4 oz)
Shaft Diameter: 5mm (.2 in)
EFLM4015A
Kv: 950 (rpms per volt)
Io: 2A @ 10V (no load current)
Ri: .03 ohms (resistance)
Continuous Current: 34A*
Max Burst Current: 42A*
Watts: up to 575
Cells: 8-12 Ni-MH/Ni-Cd or 3-4S Li-Po
Recommended Props: 10x6 to 13x6.5
Brushless ESC: 40-45 Amp
* Maximum Operating Temperature: 220 degrees Fahrenheit
* Adequate cooling is required for all motor operation at maximum current levels.
* Maximum Burst Current duration is 15 seconds. Adequate time between maximum burst intervals is required for proper coo ling and to
avoid overheating the motor.
* Maximum Burst Current rating is for 3D and limited motor run flights. Lack of proper throttle management may result in damage to the
motor since excessive use of burst current may overheat the motor.
Determine a Model’s Power Requirements:
1. Power can be measured in watts. For example: 1 horsepower = 746 watts
2. You determine watts by multiplying ‘volts’ times ‘amps’. Example: 10 volts x 10 amps = 100 watts
Volts x Amps = Watts
3. You can determine the power requirements of a model based on the ‘Input Watts Per Pound’ guidelines found be low, using the flying
weight of the model (with battery):
• 50-70 watts per pound; Minimum level of power for decent performance, good for lightly loaded slow flyer and park flyer models
• 70-90 watts per pound; Trainer and slow flying scale models
• 90-110 watts per pound; Sport aerobatic and fast flying scale models
• 110-130 watts per pound; Advanced aerobatic and high-speed models
• 130-150 watts per pound; Lightly loaded 3D models and ducted fans
• 150-200+ watts per pound; Unlimited performance 3D and aerobatic models
NOTE: These guidelines were developed based upon the typical parameters of our E-flite motors. T hese guidelines may vary depending
on other motors and factors such as efficiency and prop size.
4. Determine the Input Watts Per Pound required to achieve the desired level of performance:
Model: 15-size 3D ARF
Estimated Flying Weight w/Battery: 2.4 lbs
Desired Level of Performance: 150-200+ watts per pound; Unlimited performance 3D and aerobatics
2.4 lbs x 150 watts per pound = 360 Input Watts of total power (minimum)
required to achieve the desired performance
5. Determine a suitable motor based on the model’s power requirements. The tips below can help you determine the power capabilities of
a particular motor and if it can provide the power your model requires for the desired level of performance:
• Most manufacturers will rate their motors for a range of cell counts, continuous current and maximum burst current.
• In most cases, the input power a motor is capable of handling can be determined by:
Average Voltage (depending on cell count) x Continuous Current = Continuous Input Watts
Average Voltage (depending on cell count) x Max Burst Current = Burst Input Watts
HINT: The typical average voltage under load of a Li-Po cell is 3.5 volts. This means the typical average voltage under load of a 3 cell LiPo pack is approximately 10.5 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: 15-size 3D ARF
Estimated Flying Weight w/Battery: 2.4 lbs
Total Input Watts Required for Desired Performance: 360 (minimum)
Motor: Power 15
Max Continuous Current: 34A*
Max Burst Current: 42A*
Cells (Li-Po): 3
3 Cells, Continuous Power Capability: 10.5 Volts (3 x 3.5) x 34 Amps = 357 Watts
3 Cells, Max Burst Power Capability: 10.5 Volts (3 x 3.5) x 42 Amps = 441 Watts
Per this example, the Power 15 motor (when using a 3S Li-Po pack) can handle up to 441 watts of input power, readily capable of
powering the
15-size 3D model with the desired level of performance (requiring 360 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.
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
EFLA1040L 40-Amp Lite Pro SB Brushless ESC
EFLM40151 Shaft: Power 15 BL Outrunner
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.
Replacement shafts are available separately.
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.
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 or output port on a sensorless brushless speed control. Be sure to use heat shrink tubing to
properly insulate the wires so the wires will not short. Shorting may damage the motor and speed control.
4. If you add connectors and you no longer wish to use them, never cut the motor wires. Remove them by properly desoldering
them. Shortening the motor wires is considered an improper modification of the motor and may cause the motor to fail.
5. When you connect the motor to the esc, check the rotation direction of the motor. If you find the rotation is reversed, switching
any two motor wires will reverse the direction so the motor rotates properly.
6. Proper cooling of the motor is very important during operation. New technology has brought much higher capacity batteries with
higher discharge rates, which can cause extreme motor temperatures during oper ation. It is the responsibility of the user to
monitor the temperature and prevent overheating. Overheating of the motor is not covered under any warranty.
7. You can install the propeller on the motor shaft after you have confirmed proper rotation direction. Also consult the instruction
included with your sensorless electronic speed control for proper adjustments and timing.
8. Once the battery is connected to the motor, please use extreme caution. Stay clear of the rotating propeller since spinning
propellers are very dangerous as the motors produce high amounts of torque.
9. Never disassemble the motor. This will void any warranty.
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