Originally posted by RCCadet
A single wire means you have a motor with torque and a motor with more strands of wire will increase resistance while sacrificing torque.
You increase RPM with fewer winds around an armature stack.
Is not that simple as you posted.
Maybe the best to talk about this is Jim Greenemeyer, but, in spite that don't appear by here I'll try to explaing a little. I've enjoyed reading their posts and asking a lot to it and i use several motors winded by itself. (In fact, I'm awaiting 4 motors some day of this, only to training for the season). In fact, if you want to reach it, you can do simply going to the teamrcv.com site and reading a thread called (Ask Big Jim about Motors).
Not ever a single wind is the most powerful motor, in fact, when you get a motor with a high wire (let's say a 17.5 or 18 AWG) you are plenty of wire, but all is a fact of Circular Mils (CM).
Let's see this table:
AWG Circular Mils
As you see a #17 or #16 wire is fairly big to wind a single, but, with those wire, you need to battle a lot to pack all those wire onto the stack and could be a arm with big wires, but be too innefficient because the wire isn't tightly coupled to the stack and you lose some magnetic strength due to the air gaps.
I didn't need to tell that some winds with this kind of wire are impracticable.
The goal is to get as much CM as you can, ever if it's possible to pack efficiently on the stack.
A big wire, give you medium and high-end punch, but sometimes is good losing some punch at high to gain some at low, this is where the 'little wires' enters in the game.
If you have read about this, some motors are of the type HVW (High Variance Winds) this is simply that a double is done with wires that have a high variance on their diameter. Let's see some examples, some good known motors of this are Reedy Ti's who have two wires (one with #18.5 or #19 and another #24 if my memory doesn't fails me).
Playing with the CM numbers, you can construct almost infinite motors, some better than others, but infinite.
Another key in the 'black magic' of the winds are the type of arm stack. There are two types mainly, the torque and the rpm blanks. Now you have three parameters to play on your motors, the winds, the wires, and the arm stack.
By my own experimentation says me that the best motors I've tested 'custom winded' are in the range of 1690 - 1900 CM. Passing from this 'upper limit' the arms are highly stuffed and the arm weights a lot and the acceleration is harm a little (specially with the thick blanks).
If someone wants to know more about this, I reccomend to read the thread named at the first lines of this message and don't hesitate of asking to Jim is a very good person and they answer at all questions formulated to it. I'm reading from some time this thread and I've discovered little things that made a lot of success tunning my motors and choosing them.
Maybe I'll start soon to see some of yours in the teamrcv site.