> Ernest; since you were first to propose the internal airflow, or vane;
> what would you think is the appropriate shape, position, etc

There's still not enough data to put hard numbers on it. For that, we'd
need to know exactly where the separation occurs (somewhere around point
1) and how thick the boundary layer is at point 2. The way I like to
think of it is that you have tired air at point 1, and it just gives up
trying to make the turn. The air below point 2 is still strong, so blow
some of it into the area at that point. But, if you pull to much of the
strong air, then the air at C will be to tired to make the turn. It's a
balancing act.

The line with the slight curve is what I would try first, with the
emphasis on 'first'. You may be completely ecstatic with the first
attempt and not care to experiment further.
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Ernest;

My concern about the diverter as you have it shown is that it is trying to
compress the air and speed it up.  It seems to me that any convergence there
would choke the flow of the already low energy air - you think?

I was thinking of making the vanes with fiberglass; and glassing them in.
But you're right; an adjustable vane would be the way to go, but it does
complicate life.  Without taking the wing off and removing the cooler, I
have to work in through the scoop opening.  The scoop has two vertical
divider/supports meaning I need three separate vanes.  I'll figure out a way
to attach to those.

Al