Hi ec121,

We actually have a separate topic for Seagull 90/120 Decathlons.
http://www.rcuniverse.com/forum/m_82..._9/key_/tm.htm
I'm about to finish mine soon. You made CG = 80mm, that's what I was thinking about (not 100mm as manual says) . Now I have around 88-90mm. What to you think about that? Is it way too tail-heavy or OK?
Initially I'm planning to put 15X8 Xoar on my Saito 125 for that. The prop you used is fine for aerobatics, but the bigger prop creates bigger roll effect during a takeoff. I also equipped mine with Futaba GYA351 gyro which controls the rudder during a takeoff. Not so many guys here who posted flying results for Seagull SD 120 and your recommendations are greatly appreciated.