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AK2M4 / XT Brushless Motors

Currents, 7.4 and 11.1

22tpa xt 17 and 25

BL xt.      15.5 and 20.5.

Ah I forgot to take precocking off...wondered why auto was so similar to semi if not a little more.

The BL is much faster, esp at 7.4v in comparison, but I haven't sorted my feeding issue.

BL motor isn't fitted properly I can tell, I'll have to have look see when I've a bit more time.

 
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Took the plunge and purchased one myself.

Slowly upgrading my ARP9, and I've done everything outside the gearbox apart from the motor.

Was looking around at different reviews of brushed, but when I saw the XT Brushless for a good saving compared to other brushless; it's a good chance I'll take.

I've done RC in the past, and love the benefits of brushless.

Thanks @ak2m4 for giving such a good discount, granted pre-production.

 
dlusted said:
Took the plunge and purchased one myself.

Slowly upgrading my ARP9, and I've done everything outside the gearbox apart from the motor.

Was looking around at different reviews of brushed, but when I saw the XT Brushless for a good saving compared to other brushless; it's a good chance I'll take.

I've done RC in the past, and love the benefits of brushless.

Thanks @ak2m4 for giving such a good discount, granted pre-production.
Click to expand...


thanks, let me know how you get on.  I'm still waiting on the factory to give me the specs for this batch, however this weekend I've got a little time so will do my own no-load RPM for both speeds.

 
Just tested the RPM of the test Brushless motor,

11.1v Turnigy 15-25C (Battery around 85% full charge)

Fast = 34K

Slow = 30K

Only 12% difference give or take with a 11.1v  

7.4v Turnigy 15-25C (Battery around 85% full charge)

Fast = 20.5K

Slow = 19K

Hardly any difference. 

Full stats coming Monday fingers crossed.  I also got some Perun's in stock so I'll be able to run some full tests with one of those.  

 
Fitted the motor to my SCAR at the weekend, it's not completely back together yet but yeah...gun go BRRRRRTTT!!!

Had to modify the grip baseplate to get any sort of adjustment though. 

Any idea on more stock?

 
Lozart said:
Fitted the motor to my SCAR at the weekend, it's not completely back together yet but yeah...gun go BRRRRRTTT!!!

Had to modify the grip baseplate to get any sort of adjustment though. 

Any idea on more stock?
Click to expand...
thanks for the feedback on the grip base plate, I'll add that to the description.  I have more motors but for now I'm holding them back and waiting on more feedback, just in case. 

 
Lozart said:
Fitted the motor to my SCAR at the weekend, it's not completely back together yet but yeah...gun go BRRRRRTTT!!!

Had to modify the grip baseplate to get any sort of adjustment though. 

Any idea on more stock?
Click to expand...
I had the same experience this evening; due to the shape of the end of the motor, the grip baseplate needed serious alteration to enable adjustment.  Other than that, I am very impressed so far; it runs quietly and seems efficient.

I will probably mess around with AB and precocking on the Perun tomorrow night to see if I can break the motor,

 
Break it! Break it! Break it!!

I’ll confess, I’m still too scared of trashing a $100 motor or $75 ETU to try my T238 and Perun together. Some lovers are just never meant to meet, and you don’t know until they blow up. ?

 
My understanding of precocking is that it's just a delay in removing power after the trigger is released.

This won't affect the motor or MOSFET.

AB is more problematic, if it's shorting the motor it's possible to damage the motor electronics and no reason to suspect AB even works on a brushless.

 
I've got an Aster in the gun I am running the brushless motor in. AB is all the way off and to be honest, even on a 7.4v LiPo I'm not seeing any reason to bother with precocking.

 
@Colin Allen thanks, i've got a epg-c one here I'll give it a test.  Also have one of those from an old g+p magpul so i'll try it out.

 
I was just comparing the XT's specs with Chihai's 2 brushless models and here are my findings:

1. Torque vs RPM is also a thing in brushless too, because Chihai's 39k has higher torque (starting torque per amp) than their 48k model by a rather large margin (say about 28% more)

2. Converting the numbers between N.m and kg/cm, XT's actually has a slightly higher torque than Chihai's 39k by about 6%, but of course the RPM is lower

3. Otherwise the spec looks pretty proportional to Chihai's 39k, nothing seems dramatically different

4. However Chihai is using UH grade magnets which I think is rated for 180 Celsius, compared to normal grade (?) of 80 Celsius, which should make it more reliable and stable in game, although this may be a moot point (if there is a mosfet there will be some current protection to prevent overheating in the first place)

5. Personal opinion, Chihai's toggle switch between two speed settings is much more fool proof than XT's fiddly method of switching

 
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