VRS Verticality
Ramen,
Must agree with Nick and therefore disagree with you on the verticality question. In several test programs on different models, all have been consistent in that VRS was achieved only with vertical descents. Vertical means relative to the air mass, now, so if there is some wind, the descent must be at zero translational velocity relative to the air mass. Its a lot harder to find that perfect spot than a lot of people think.
Thanks,
John Dixson