Originally Posted by Raman

Silvercan motors we're not exactly fair. There were many who cheated by using tricks to modify the motors

That's why they changed to brushless. However not all 21.5s are the same. Ever since blinky classes started the ESC and Motor manufacturers scrambled to come up with the new thing to make you buy their product. First there were high rpm versions of the motors, when that was not enough, some motors manufacturers just label 21.5 on what ever they want. There are no set guidelines as to how many precise KVs at 21.5 should put out.

So I understand the reasoning.

As for people leaving the class.. The same was said initially when the switch was made to brushless and yet the class continues. Everyone will kick and scream initially and then they will buy the motor.