QuadPlane Nose Dipping When Yawing

Hi all, we are trying to build a quadplane with the RVJET flying wing kit.
Pitch and roll works okay, but when we gave a slightly larger yaw the nose would dip and unbalance the plane.


  1. CG line is at the correct location
  2. Motors are symmetrical
  3. Tried moving CG line further back, doesn’t help

Does anyone know what to do?

Video: https://www.youtube.com/watch?v=ipZxB-uEYDc&feature=youtu.be
Log: https://drive.google.com/file/d/1LFWBN59LyRROPiEwPPj6B_AiQUynn2Br/view?usp=sharing

I have an RVJET Quadplane and I found that wing flex was an issue until I stiffened things up.
It does not look like you have an issue at slow yaw rates, only when you quickly yaw it.
So my bet is frame flex.