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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.
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