My GP Extra 330L started life with a Quadra 75 (72 cc ~7.5 lbs). It flew well at 23.5 lbs dry with a Zinger 24X10, and would even hover (and gently pull out).

I wanted more 3D oomph...since the ZDZ-80 I have in my H9 Sukhoi is definitely plenty of power and over 2 pounds lighter than the Quadra, I'm in the process of getting another ZDZ-80 to go in my GP Extra. Heck, with carbon fiber goodies, I may get the all-up weight down to 20 lbs!

Enjoy it - it's a "great plane"!