sultan68
Senior Heliman
Location: Broomfield, CO Elevation 5420'
My Posts This: Topic Forum | This isn't a blade pitch issueAs you are aware, the XRB uses counter rotating blades to offset the torque produced by the upper and lower main rotors. When one motor turns slower or faster than the other, this causes the XRB to pirouette either left or right. Idealy, during normal hovering, the motors are turning at exactly the same speed which is a zero pirouette rate.
To fix this problem, sometimes the armature in the can of the motor gets a bit dry inside and a drop of Tri-Flow or similar low viscosity oil on the armature at the top of the motor should be enough to remedy this situation. It has worked for me and I don't have the problem anymore. In other words, oil the motor! 
Also, the lower rotor can sometimes slip off the striated portion of the outter main shaft and when this happens it is the same as losing your tail rotor on a regular heli. If this happens simply slip it back on and possibly re-tighten the screws to prevent it from slipping off again. |
