Originally Posted by
kenparry
Not sue what "twizzle" is, but the midair was when they were doing an opposition turn and they met heading in opposite directions. My recollection is that the manoeuvre was modified after to include height separation - which had not been done previously.
It was the Carousel, which had the inner aircraft slightly higher than the outer one to align the fuselages when viewed from datum. That height separation was a few feet, dependent on the miss distance horizontally and the height above the ground at the cross. Pretty certain the Gnat and Hawk were the same for this manoeuvre.