Adding new air-frame for multicopter.

[chuong98]

We want to do an experiment with a new configuration, as illustrated in the Fig The idea is: M1 is the big motor at the Center of the Gravity to create 99% thrust, and facing down. M2 is small motor to control positive pitch, facing up M3,M4 are the small motor, M2 tilts 45deg, and M4 tilts -45deg, to create yaw moment to balance with the big motor, while also control roll and pitch.

Take the center motor at the origin, and follow NED coordinate, the position of motor is #motor (x,y,z) (direction in (x,y,z) ) M1 (0,0,0) (0,0,1) M2 (-R,0,0) (0,0,-1) M3 (-R/2,R,0) (cos(45),0, -cos(45)) M4 (-R/2,R,0) (-cos(45), 0,-cos(45))

I would like to create quad_cT config in the mixer file, how should I do it. Thanks for your help.