[Land-speed] roof flaps

[Benn]

Anyone have a sense of how tricky the design of roof flaps is?  Specifically,
wondering if I might incorporate them into my MR2.  It would be nice to keep
the shiny side up if the car spun at speed.  I'm pretty ignorant about these
and how they work.   I assume they must be positioned exactly right on the
roofline to both stay shut during forward motion and open readily as the yaw
angle gets to the critical point.  Thoughts?

Benn