Hi guys, I finished my DP 1.20 Ultimate about two months ago. It flies with Saito 1.80 mounted inverted with stock muffler and JR servos, standard in the wings/throttle and high torque on elevator and rudder. I did replace the kit supplied gear with a carbon fiber replacement after reading comments on the internet that the stock gear was weak. The plane flies GREAT with the 1.80, plenty of pull and snaps like crazy at high rates. I'm sure it will hover but the pilot is lacking! I'll try and locate the kit manual to find the answers to your questions.