Iv been flying my RB for 33 hours . No problems and a joy to watch . Powered by the TTPro 90 . Shes not the fastest pylon racer in the world but everyone at my flying club say what a fab looking bit of kit . Too many people out there think they have to make the fastest model pylon racer ever putting large amounts of load on the model frame and going mad overpowering it with 4 stroke 180's its simply not designed for that sort of power .TT say that pro 61 or 91 is the recomended engine so those of you who have gone mad overdoing it shouldnt be suprised when it gives out. However I will be the first to shout from the roof tops if something fails with regard to the stab with the sort of power Im using.