GH2820-04 Outrunner Brushless Motor – Firewall Mount

Today Scott and Basil decided to install this motor on the Multiplex Dogfighter.  Not having our Amp meter, we took a educated guess for the prop size.  We started with an APC 7 x 6 and had good results.  But of course it was not the 100mph we were looking for.  So we took a GraysonGold 4S pack and shoved into the battery hatch.  There was not much room, but it did fit.  Gave it another toss on the 4S lipo and we were able to reach 100mph.

On landing we check out the motor and springily the motor was cool to the touch.  It looks like this is a real economical winner.  The Grasyon Hobby 2820-04 with a 7×6 gave us the best flying results.  Not the fastest times, but the most torque with the most flying time.


Great Motor for the Multiplex Dogfighter. The Grayson Hobby GH2820-04 can put your dogfighter at speeds near 90mph!

Similar to an E-Flite Power 15

Motor Stats:
Li-Po Battery: 2 / 3 cells
RPM per volt: 1500
Max Current: 60A / 60 sec
Dimension: 35 x 36mm
Shaft 4mm
Weight: 132g / 4.6oz
Max Watts: 600W
Continuous Watts: 500W
Recommend ESC: Grayson Hobby 60Amp
Recommend Prop Range: 10 x 5 / 9 x 6
Recommended Model Weight: 35oz – 88oz / (2.18lbs – 5.5lbs)


Multiplex Dogfighter Upgraded Speed Combo

Multiplex Dogfighter Upgraded Speed Combo2820-04-Reverse


4 thoughts on “GH2820-04 Outrunner Brushless Motor – Firewall Mount”

  1. I need to know what would be a good motor combo to up grade my harbor freight p51d Mustang I need more power?

    1. Im not sure the size of the HarborFreight P51, but I hear most are using the MicroJet V3 with 20Amp ESC. The battery of choice is the GraysonBlue 1600 mAh 11.1v (3S)

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  3. To understand the advantages of the brushless motor, a basic understanding of the brushed motor is required. In a brushed motor, an electromagnet is mounted on a spinning arm, called an armature or rotor. The armature sits between two magnets set in a horseshoe configuration, collectively called the stator. When power is fed to the electromagnet, the arm moves, aligning the north and south poles of the electromagnet with the opposing poles of the stator.*

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