I have successfully used the NTM 28-36 (28mm diameter, 36mm length) motors in a number of multirotor designs, on the YQ2 they work well and have adequate power, but when pushed they get hot. I searched for an alternative with greater current handling, similar weight but still great value for money.
NTM 30-35 motors with 10" X 5 Graupner e-props.
There is no alternative NTM in the 750Kv range, so I went with the NTM 35-30 1100Kv motor which has a larger diameter but shorter can length. Interestingly both motors are around the same weight but they have very different current handling. Here are the specifications of both motors:
|
|
NTM 28-36 |
NTM 35-30 |
|
Kv (rpm/v) |
750 |
1100 |
|
Weight (g) |
87 |
88 |
|
Max Current (A) |
18 |
32 |
|
Power(W) |
265 |
380 |
|
Length (mm) |
36 |
32 |
|
Diameter (mm) |
28 |
35 |
The 28-36 750Kv motors are a nice match with 10 x 4.7 APC propellers, the higher Kv motors would therefore require a propeller with much less thrust. I had heard that the Graupner e-propellers provided less thrust than other propellers of a similar diameter and pitch, so I decided to give them a try. Here are the test results for both motors:
All tests were carried out with a fully charged 4S battery on the YQ2 Quadcopter (X 4 motors) at 100% throttle.
|
|
28-36 10” x 4.7 APC slow fly |
28-36 10” x 5 Graupner e-prop |
35-30 10” x 5 Graupner e-prop |
|
Current (Amps) |
50 |
33 |
71 |
|
Watts |
750 |
495 |
1050 |
During flight testing the 35-30 motors performed really well, very high performance and the motors came down cold after each flight.
Verdict - If you want very high speed from the YQ2 and you can afford the Graupner e-props, then go for the 30-35 motors. They sound smoother and have quite a bit more power. If this is your first quad then stick with the 28-36 motors until you are used to flying it and are less likley to break expensive props!
Take a look at this video to see these motors in action:
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