540 Xl size

[BrianG]

You're running a 5700 in an emaxx??? Doesn't that get hot? I would say no smaller than an "L" size, preferably an "XL" size, for cooler operation. The 5700 is, or close, an "S" size. Those are all 540 diameter (although I hear the Mamba Max motors use a 380 size rotor), but the length will give you more torque.

Oh, and your question about a Lehner "XL" size, that would be either the 1940 or 1950...