After thinking about this for a second, It began to make a lot of *sense*:
The smaller magnets are used to reduce weight BUT you still get that low end response and thrust from the larger magnets.
  Now for next ul build I'll use these motors with mono-blade props...

--__--

Mmm. Bummer. Super bummer. I was right on schedule to fly (read: probably fry another quad) today. I'm so glad I took a break to browse the forum. I've just been inspecting my 4 Tmotor BB V2 2207 1950Kv, batch 08, of course, and I'm wondering what these little glue-like spots are. Should that stuff be there? Is it possible it could damage the motor eventually? I haven't noticed it before on other motors, but I haven't looked for it either. 

(26-Jun-2021, 07:33 PM)droneduchess6677 Wrote: I'm wondering what these little glue-like spots are. Should that stuff be there? Is it possible it could damage the motor eventually? I haven't noticed it before on other motors, but I haven't looked for it either. 

It's balancing compound. Like balancing weights on the wheel of your car. They balance each motor at the factory and apply compound for extra weight on one side of the motor if and where needed.

Thank you, Snow. As always, y'all are awesome. My bf suggested that, but we needed a second opinion. So the next logical step with the Tmotors is to contact the vendor (Race Day Quads in this case) & ask for a refund or rather, an exchange? Do you think the vendors will be aware of this issue soon, if not already? Anyone care to share your opinion on what motors I should check out this time around?

(26-Jun-2021, 07:56 PM)droneduchess6677 Wrote: Thank you, Snow. As always, y'all are awesome. My bf suggested that, but we needed a second opinion. So the next logical step with the Tmotors is to contact the vendor (Race Day Quads in this case) & ask for a refund or rather, an exchange? Do you think the vendors will be aware of this issue soon, if not already? Anyone care to share your opinion on what motors I should check out this time around?

Yes, I would definitely get rid of the Black Bird V2 motors otherwise you risk frying your ESC. I would hope that RDQ are aware of the issue. If not then point them to Damien Gans' Facebook posts on the issue.

I don't like iFlight for their electronics (flight controllers and ESCs) but their Xing line of motors are fairly decent. The EMAX ECO II are another option where you are getting a $20+ motor for less than $15. People don't know how EMAX are making such a good motor for so little money. The Rcinpower GTS motors are also a good choice.

(18-Jun-2021, 08:46 AM)SnowLeopardFPV Wrote: That's bad luck. The only sensible thing to do is to contact the vendor and get them returned for full refund. I assume you're already doing that. Make sure you also demand a full refund for any shipping you paid as well because this wasn't your fault. The vendor will then need to claim that money back from T-Motor.

Yes sir! Got the shipping label from them today!

I just switched a quad over to 6s and bought 4 tmotor f40 pro v4 1950kv. The very first flight I punched out was way up there and I thought I had a desync but nooooo one of the brandy new motors smoked itself. All the coils are black and melted.

Geprc mark 4 hd bottom frame snapped in half on impact.

Sucks for me

(29-Jun-2021, 12:53 PM)Critterracing Wrote: I just switched a quad over to 6s and bought 4 tmotor f40 pro v4 1950kv. The very first flight I punched out was way up there and I thought I had a desync but nooooo one of the brandy new motors smoked itself. All the coils are black and melted.

Geprc mark 4 hd bottom frame snapped in half on impact.

Sucks for me

So sorry for your luck. Luckily I saw this topic on here before I installed them. Better luck to you.

So helpful as I’m looking for new motors and was looking at blackbird. THANK YOU! 
Anyone have experience with TBS Ethix Mr Steele stout v4? I passed on buying previous versions because i heard there were quality issues there too…any chance there’s a legacy company trending in the right direction out there?

the fairness about the product is high on an eco motor
the emax ecos are decent good value.

"mr steel" motors might be just motors from a company rebranded with ethix and more expensive... the most ethix products are a bit a scam in my eyes, mr steel doesnt have a production he just rebrand products.

Not wishing to take anything away from Steele, but his (re)branded motors are overpriced "nothing special" motors IMO. You pay a premium for the "Ethix" logo and a custom paint colour. That is all. Just my own opinion of course.

I had the v2 ethix motors, bearings went ratchety pretty quickly. Tmotor velox are uninspiring, bh avengers are awesome. Three builds with the avengers now, running well.

we compared some motors on racing quads, same components just other motors. the conparison was the bh 2207 1750 gom edition (the orange ones) to some xnova (the new lightweight ones at 1900kv.
the bh was more precise overall, "more smooth", it had better throttle response special on low mid throttle - sadly the results matching the kv difference too so we need to compare again with a more close kv...
overall bh gom motors are very nice, at half the price of an xnova if grabed on a discount offer. the only !no go! was the original prop nuts, get several times loosen in crashes.

i trust a lot in brotherhobbys products, someone there fly them, know what the needs are :-) hopefully that doesnt change :-)