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By only moving A1 we are mostly controlling the pitch of the strongback. The drawback is that we However, this is not enough to obtain a pure pitch motion because we also have a parasitic motion on Y. This is why we need the inverse kinematics in place to keep all the degree degrees of freedom in the cartesian space as close as possible to the target configuration
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By completely ignoring the inverse kinematic we on both quad_x and quad_y the maximum target position (+-2 mm) is never achieved.
It is also clear that the quad_yaw is in phase with the quad_x and the quad_pitch is in phase with quad_y. Both show a maximum error of more than 1 mrad.
