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Power 15 Brushless Outrunner Motor, 950Kv

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: 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 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: 15-size 3D ARF (converted to electric)
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: 9.9 Volts (3 x 3.3) x 34 Amps = 336 Watts
3 Cells, Max Burst Power Capability: 9.9 Volts (3 x 3.3) x 42 Amps = 415 Watts

Per this example, the Power 15 motor (when using a 3S Li-Po pack) can handle up to 415 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.

Please see our web site for the most up-to-date information and airplane setup examples.

15-size 3D ARF (converted to electric)
Option 1:
Motor: Power 15
ESC: E-flite 40A Brushless (V2) (EFLA312B)
Prop: APC 11x7E (APC1107E)
Battery: Thunder Power PRO LITE 2100mAh 11.1V 3-Cell (THP21003SPL)
Flying Weight w/Battery: 2.1 lbs

Amps Volts Watts Input Watts/Pound RPM
27.8    10.4  289              138           8200

Expect higher speeds and lower thrust for mild 3D aerobatics. Average duration is approximately 7-9 minutes depending on throttle management.

Option 2:
Motor: Power 15
ESC: E-flite 40A Brushless (V2) (EFLA312B)
Prop: APC 11x7E (APC11070E)
Battery: Thunder Power PRO LITE 4200mAh 3S2P 11.1V (THP42003S2PPL)
Flying Weight w/Battery: 2.4 lbs

Amps Volts Watts Input Watts/Pound RPM
31       11.1  344                143        8700

Expect average speeds and higher thrust -ideal for F3A and extreme power for 3D and artistic aerobatics. Longer duration is approximately 15-18 minutes depending on throttle management.