The tail rotor build is next and is one of the more problematical areas of the X400 in terms of getting it to operate smoothly. On the review model the following things needed some small attention : Blade grips Blade grip balls Blade grip ball links The blade grips themselves had some minor molding remnants that made them not rotate freely on the tail rotor hub. This was fixed with a modelling knife and some fine grain sand paper. The blade grip balls were also similar in that they needed reaming to get them perfectly round and free from molding lines. The blade grip ball links on the pitch slider neded squeezing with pliers to get them to run freely on the blade grip balls. Lastly the tail shaft needed some teflon based oil for the tail pitch slider to move in a smooth and free way. Without all these things being done tail wag manifested at all gyro gain settings. First the rotor hub assembly : This is very easy, a simple case of inserting the bearing into the blade grip. Loctite should be used on the screws going through the bearing into the tail rotor hub. The tail blades should be installed such that the blades can rotate in the grips with only slight pressure. Tail rotor hub parts Assembled tail rotor hub High-res tail rotor High-res tail rotor High-res tail rotor High-res tail rotor Secondly the tail gearbox assembly : The only thing worth mentioning is to remember to install the belt when putting the gearbox halves together. Otherwise there is nothing complicated to do in this step. Be careful how hard you tighten the long gearbox screws as it is eay to strip these threads as you are just screwing into plastic. Gearbox half Gearbox half with tail control lever Two gearbox halves Tail gear and shaft Tail Gearbox Tail Gearbox Tail gearbox High-res tail Back / Next