RE: Heli max Kinetic 50
I own a Kinetic 50, and what can I say. In 6 flights it had 2 crashes. The first doubt to a bad servo (JR DS821) that controlled the pitch, and the second doubt to a failed screw, in the collective arm (be carefully with this screw!!). In this case the cyclic control failed causing a crash. Flight characteristics are: very stable and predictable behavior. Before the kinetic I used to fly small helis as the Walkera #59 and the Heli Max MX400 and the differences are noticeable. Bigger is more stable.
I powered the helicopter with an Enya 50 SS Heli, a not so powerful engine as the recommended O.S. 50 Hyper engine, but for hovering and real flight is more than enough. But if you want to perform 3D maneuvers, you'll need more power. For tail servo I've installed a Futaba S9254 and the gyro is a GY401 BY Futaba. Be carefully with the CCPM linkage, this is a mechanical CCPM and need more attention than other systems