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The Emax BL2820/07 is a 5.2 ounce, 920KV, 570 watt outrunner brushless motor. It's a good choice for sport planes weighing 35 to 65 ounces, and 3D models weighing 30 to 50 ounces.
The BL2820/07 is designed for use with 3 and 4 cell Lipo batteries. When using a 3 cell Lipo, the APC 11x7E is a good prop for sport planes. The APC 12x6E prop can be used for maximum thrust, and is a good choice for 3D flying.
We suggest using a 3 cell Lipo battery that is rated for about a 60 amp continuous discharge (or more), such as an 11.1v 2200 30C to 11.1v 4200 35C. Good 4 cell Lipo choices would be 14.8v 2200 35C to 14.8v 3300 35C.
We recommend using a 50A to 70A Electronic Speed Control (ESC) with this motor.
The BL2820/07 comes with 4mm male connectors installed, and female connectors are included for your ESC.
MOUNTING OPTIONS: The BL2820/07 can be mounted in front of a firewall using the included X mount and 5mm prop adapter.
Propeller data for the BL2820/07 using a 3-cell Lipo battery:
It's a good idea to balance all propellers with a Propeller Balancer before using them on this motor.
Rotating propellers are dangerous. Please stay clear of prop and wear eye protection.
APC 12 x 6E: 72 oz thrust at 39 amps
APC 11 x 5.5E: 59 oz thrust at 31 amps
APC 11 x 7E: 63 oz thrust at 35 amps
APC 10 x 5E: 48 oz thrust at 21 amps
APC 10 x 7E: 51 oz thrust at 28 amps
Propeller data for the BL2820/07 using a 4-cell Lipo battery:
APC 10 x 5E: 77 oz thrust at 34 amps, 530 watts
APC 9 x 6E: 58 oz thrust at 31 amps, 490 watts
Please be aware that the battery used can make a tremendous amount of difference in the performance of brushless motors. The above data was obtained using batteries in good condition that were fully charged. Thrust and amp draw may be less with the use of batteries rated at lower amp output, and slightly more using batteries rated for higher amp output. Other factors, such as ESC timing and variations in actual motor KV can affect the performance of brushless motors as well. We recommend the use of a Watt Meter to test the current draw of your particular power system, especially if you plan to use a prop that pushes the motor near it's maximum amp rating.
Emax BL2820/07 Specifications:
Weight = 5.4 ounces (153 grams)
Diameter = 1.5 inch (39 mm)
Motor length = 1.6 inch (41.5 mm)
Shaft = 5mm x 0.7 inch
Voltage = 9.0 - 17.0 volts (3 or 4 cell Lipo)
Current = maximum of 40 amps or 570 watts for 30 seconds
KV = 920
Mounting holes are spaced 25mm on center and are tapped for 3mm screws
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