Initial impressions and bench testing of the GepRC GR2306 2750 kv motor

Hi Everyone -

I received this GepRC GR2306 2750 kv motor in the mail yesterday and managed to get some bench testing done today😀

As you can see above, it comes with one prop nut and two sets of M3 screws, one set 7mm long and the other 8mm long.  Without any hardware, the motor weighs 32 gr/1.1 oz.  The motor wires are 150mm/5.9" long.

It has a hollow shaft and fairly minimal metal on the top.  According to the Banggood write up in the link above, it is made with 7075 aluminum.  The shaft is hollow all the way through.

It has curved N52 grade magnets which are one of the best grades of magnets used in brushless motors, it has a nice cut out as you can see in the bottom for the wires to be protected.  It is a "naked bottom" motor with no full base plate as you find on a lot of motors.  The gap between the stator and the magnets is very tight and when the motor is spun by hand, it spins smoothly, but the magnets feel very strong.  The shaft is held on with a small hex bolt, however it does not come with a spare like some other motors I have tested.

The bolt pattern is 16x16 mm, so I will only be able to use two screws to hold the "X" mount to the motor, but I think that will be sufficient.

With the prop and all the other hardware needed to put in a park jet, the motor weighs 48 gr/1.7 oz.

I tested the motor with both the 6x4 APC gas prop and the 6x3 EMP prop with the Turnigy Plush, Turnigy AE-45A ESC and Hobby Wing Platinum PRO 40A ESCs.  You can read the complete details as well as find links to all the components on the motor test spreadsheet.  The numbers are all on 3S.  Again, this motor preferred the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz for both props.  According to the Banggood specs, this is a 45A motor.

Based on the numbers alone, I think this motor might push the EMAX RS2306 2750 Kv motor out of the top spot for motors I have tested thus far.  

Here are the best numbers for the GepRC GR2306 2750 kv motor with the 6x4 APC gas prop.

50% throttle - 19.9A/238.0W producing 685 gr/24.2 oz of thrust;

100% throttle - 45.0A/506.3 producing 1115 gr/39.3 oz of thrust.

These are the best numbers I have seen for any of the motors I have tested thus far with the 6x4 APC gas prop, although it is a bit amp hungry.  Based on experience, I would fly this motor with the 6x4 APC gas prop and the Turnigy AE-45A ESC, although it would be pushing the ESC especially hard.

Here are the best numbers for the GepRC GR2306 2750 kv motor with the 6x3 EMP prop and Turnigy AE-45A ESC.

50% throttle - 18.9A/225.8W producing 730 gr/25.7 oz of thrust;

100% throttle - 41.7A/478.2W producing 1290 gr/45.5 oz of thrust.

Wow😁😲  This is the first motor I have seen that produced over 700 gr of thrust at mid throttle, incredible!  I won't bother fooling around, the flight test will be with the 6x3 EMP prop and the Turnigy AE-45A ESC😉  Excited to get it out for a spin very soon😁

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott