I haved done some work on this complex, especially how to smoothly transit
between different NACA shapes.

These are my library projects, that will solve all your issues.

http://www.thingiverse.com/thing:898554    NACA library and shape
transistion based an linear_extrude()
http://www.thingiverse.com/thing:900137    general shape transition based
on sweep()
http://www.thingiverse.com/thing:1208001  Generalist approach on transition
with spline interpolation

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Parkinbot, your blithe promises are too big.

1. I tried your 900137.  I got missing include.  Seems the file
   capitalization was wrong.

2. Got syntax error.  Seems you were using some bleeding edge features.  Had
   to switch from stable to testing version of openscad.

3. Your example worked.  But the code is full of cryptic stuff.  Not for the
   faint of heart.

But, hey, it looks cool!  And you contributed to the community.

I'll build on the OP's work.  It's not as clever as yours, but it's
understandable and it worked first try.

T

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