Originally Posted by
ATC Watcher
Shooting at an ambulance is not very nice , besides the fact that a 757 produces more vortex than a 380 , the beasts are likely to be still flying long after you retire...
The 757 produces more votex on approach than other aircraft in its size range but is still not remotely comparable to the A380 or for that matter the 747 and widebody twins.
””As a result, the industry set out to determine if the wake of the Boeing 757 is larger or more hazardous than that of other aircraft. The assessment of the Boeing 757 and the 767 was inconclusive. While the 757's wake decayed faster than that of the 767, its vortex velocity was approximately 50 percent higher—during one test. Because of this single unusual measurement, the FAA placed 757s in the wide-body category for separation rules, along with the larger 747s and 767s. At this time, the 757 is the only narrow-body with this restriction.
Read more at
https://www.airspacemag.com/need-to-...LmXJ5JZ7PBe.99
That one test has never been duplicated despite repeated attempts.