Roof Spoiler? How did they do it?
#6
That looks like a good way to create drag and negate the effect of the wing. It wrecks the laminar airflow coming from the roof and places it where your wing would be, effectively stalling it. Unless your wing has its own flight level, like the example given.
#10
that RX-8 belongs in this thread: https://www.rx8club.com/general-auto...92879/page174/