Power 90 Brushless Outrunner Instructions
Thank you for purchasing the E-flite Power 90 Brushless Outrunner Motor. The Power 90 is designed to deliver clean and quiet power equivalent to or surpassing the power of a 90-size 2-
stroke glow engine for sport and scale airplanes weighing 8- to 13-pounds (3.6- to 5.9-Kg), 3D airplanes up to 10-pounds (4.5-Kg), or models requiring up to 1800 watts of power. It will provide
excellent 3D performance for the Hangar 9 Frenzy 100 ARF, ShowTime 4D 90 ARF, FuntanaX 100 ARF and other similar class models. The Power 90 also provides great power and
performance for the Seagull Ultimate Bi-Plane 90 ARFs.
Power 90 Brushless Outrunner Features:
• Equivalent to or surpassing the power of a 90-size 2-stroke glow engine for 8-13 lbs (3.6-5.9 Kg) airplanes
• Ideal for 3D airplanes up to 10 lbs (4.5 Kg)
• Ideal for models requiring up to 1800 watts of power
• High torque, direct drive alternative to inrunner brushless motors
• External rotor design for better cooling
• Includes mount and mounting hardware
• High quality construction with ball bearings and hardened 6mm steel shaft
• Includes two 10mm prop shaft adapters tapped out for 8-32 threads
Power 90 Specifications
Diameter: 56mm (2.20 in)
Case Length: 52mm (2.00 in)
Weight: 450g (15.8 oz)
Shaft Diameter: 6mm (.24 in) (Includes two 10mm prop shaft adapters)
EFLM4090A
Kv: 325 (rpms per volt)
Io: 2.00A @ 10V (no load current)
Ri: .02 ohms (resistance)
Continuous Current: 50A*
Max Burst Current: 65A*
Watts: up to 1800
Cells: 6S-8S LiPo or 18-26 NiMH/NiCd
Recommended Props: 16x8 – 18x8
Brushless ESC: 85A High Voltage
* 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 cooling 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 below, 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. These 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: 100-size 3D ARF
Estimated Flying Weight w/Battery: 9 lbs
Desired Level of Performance: 150-200+ watts per pound; Unlimited performance 3D and aerobatics
9 lbs x 150 watts per pound = 1,350 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 Ni-Cd/Ni-MH cell is 1.0 volt. 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 10 cell Ni-MH pack is approximately 10 volts and a 3 cell Li-Po 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: 100-size Frenzy 3D ARF (converted to electric)
Estimated Flying Weight w/Battery: 9 lbs
Total Input Watts Required for Desired Performance: 1,350 (minimum)
Motor: Power 90
Max Continuous Current: 50A*
Max Burst Current: 65A*
Cells (Li-Po): 8
8 Cells, Continuous Power Capability: 28 Volts (8 x 3.5) x 50 Amps = 1,400 Watts
8 Cells, Max Burst Power Capability: 28 Volts (8 x 3.5) x 65 Amps = 1,820 Watts
Per this example, the Power 90 motor (when using an 8S Li-Po pack) can handle up to 1,820 watts of input power, readily capable of powering the
100-Size Frenzy 3D model with the desired level of performance (requiring 1,350 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.
(23 pages)
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