> You mentioned the exit path as near the end of the turtleback. Is
> this
> on a Dyke Delta? I don't know about the Delta, but on most
> conventional
> airframes the top of the fuse. behind the canopy is actually a
> *high*
> pressure area. Have you checked this out with the designer of the
> airframe?
> Charlie
> former owner of a Thorp T-18, a design that has the cockpit fresh
> air
> input cut into the *back* of the canopy.
>
>

The Delta is a flying wing design, ie the fuselage is airfoil shaped and actually carries 1/3 of the air load.  My assumption was that as an airfoil, it would have airfoil characteristics.  NACA studies indicated that the lowest pressure point on an airfoil was at the 70% MAC point.