Wingovers are the normal means of entry to the steep dives used by dive bombers enabling dive entry without resorting to negative g. The steeper the dive the more accurate the delivery.
Technique for example for the Mustang was to approach a target a little to one side and 7,000 feet above so that the target appeared to disappear for a few seconds as it went under an inboard section of the wing. Then one would execute the start of a barrel roll, pulling the nose hard up, over and well down through the horizon whilst inverted meanwhile rolling out to line up on the target in a steady 60 degree dive. This 60 degree dive angle appears to the pilot to be almost vertical.
This manoeuvre would result in a reversal of direction and a stabilised dive to the release point quickly followed by a high g pull out.
Perhaps there is yet an old Stukka pilot out there who can describe the dive entry for one of those.