Originally Posted by ralph_c
Surely rules about the dimensions of parts within the motor aren't strictly necessary...? What would be wrong with having set external dimension limits, and letting anything with 27 turns of a set width copper wire allowed? If manufacturors have a freer reign but have to be selling the motor for under £30 then the manufacturors and us are on a level playing field, right?
There might be flaws in this, but I don't really see why motors should be limited so much, as long as all the manufacturors are following the same set of rules.
To my understanding, the minimum stack web width was introduced because the motors are machine wound and a small web will cause problems when winding them, making them a lot more inconsistant from motor to motor.
However, I've just checked the ROAR rule book and there is no mention of that stack web dimension in there. BUT there is a minimum allowed length of wire specified which may have led to that rule (smaller web = shorter wire).