This is my Predator with OS FS 91 SII PUMP, it is fantastic in flight, weight 3.5 kg, servos; 2 HS 545 BB HItec for aileron, 1 HS 645 BB MG for rudder, 1 Hs 81 for torttle, and 1 HS 545 BB for elevator, 5 cells 1470mah SANYO. I have canged the original undercarriage with a carbon MK KATO, the original is very bad!! CIAO Alfo.