Krayzc, I am running a Bambula 20X10 on the ZDZ 40. It is the best mix of Rpm:thrust:vibration out of my Zinger Pro 20X10 and Mejzlik 20X9.

I like the Bambula props... They are fat (as in camber, not chord...although they do have a wider chord than most) and very stiff. They are not RPM Kings ...but my 20X10 pulls like no tomorrow.

Premium/HP2 32:1, Bambula 20X10, 6480 rpm @ 120' ASL and 75 Deg.

I have ordered one for my ZDZ80

Cheers
Bert