I run the 18x6 Mejlick on my 1.80 Saito and get right at 9g's. Great throttle response and excellent verticle. I just picked up a 1.80 RCS to go on my Aeroworks Profile and RC Showcase sent a 18x8 with it. He said he was out of the 20x8. I'm wondering how big I can go if I use a CF prop on it?