The initial hose length before the contact of the probe and drogue is set as 14.3 m here.
Indeed, this kind of tracking performance is expected, because we always expect the hose-drogue to keep stable even with the perturbed contact process of probe and drogue in AAR.
One critical stage of PDARS in the air refueling process is the docking of the probe and drogue .
One of the keys to the success of aerial refueling for PDARS is the successful docking between the probe and drogue. The study of probe-drogue docking success probability offers an important support to achieving successful docking.
It should be noted that there are references about how to decrease bow wave effect by appropriately locating probe and drogue in practice, such as  that proposed a drogue dynamic model under bow wave effect in probe and drogue aerial refueling, which can describe the drogue dynamics during the docking stage and be applicable to a docking controller design to overcome the bow wave effect actively.
Cai, "A survey on modeling and control problems for probe and drogue autonomous aerial refueling at docking stage," Acta Aeronautica et Astronautica Sinica, vol.
Campa, "Vision-based autonomous probe and drogue aerial refueling," in Proceedings of the 14th Mediterranean Conference on Control and Automation, (MED '06), Ancona, Italy, June 2006.