RE: Brillelli 366GT *60cc*
The 366GT is a 60cc chainsaw (Husqvarna) cylinder/piston/head, with a custom bottom end, and purpose designed front hub. It is NOT a derivative of any kind of Zenoah, that I am certain of.
As for published "thrust" or rpm....I don't go there, won't go there, as reported numbers are never comparitive of side-by-side runs, same prop, same gas, same day/temp/humidity. Also - whether a motor is brand new, slightly broken in, or in "normal" mode makes HUGE differences in the power available.
I haven't tried a 24" prop because I really like what I'm getting with the NX 23 x 8. Will soon try Vess 23A on the Yak to see what we get, performance wise.
Unfortunately (this is my opinion, only, perhaps) the only REAL comparison that has any meaning is throttling up and pullling vertical. That's where I find out several things;
a.... is the motor "tuned" properly
b.... is the right prop on it?
c.... does it have the power that I need for what I want to do?
Yes, sounds inefficient, but it is the only way that I really "know" what a motor will do. And it works for me.