RE: frenzy and ST90
I've run both a 13X6 and a 14X6 on my ST90. Which one you wind up using depends on your particular tastes and exactly what you like to do. Mine seems to pull out of a hover better with the 14X6 but does snaps and waterfalls etc better with the 13X6. I assume that's because the 13" prop has a little less gyro effect. I could be wrong but it seemed to rotate quicker with the 13" prop.