...And if you look at the weight of a Moki 2.10, it really isn't much lighter than a ZDZ 40, and the ZDZ 40 has more power!
What prop are you spinning on that ZDZ? The Moki 2.1 will spin the 20x10 at 7500+ and the 20x8 at 8200 or so.
The ZDZ spins less prop, like a 19x8, at less RPM.
-Cheech