>
http://www.aircraftspruce.com/catalog/bvpages/prop_duct.php
>
> --
> Perry Mick
> http://www.ductedfan.com
>
>
>

Thank you, Perry.  I'm on it.

I would like to clear up one misconception, though.
I don't want to start an off topic flame war, but
I've heard this several times and it's the sort of
thing that tends to confuse and restrict people.  

Algorithms can not be copyrighted.  You can read a
book and publish everything you've learned on the
internet, as long as you don't copy several pages
verbatim.  You can even reprint all the equations.
This is a right in the US that is protected by the
CONSTITUTION.

There is another consideration, and that is that
Martin Hollman spent a lot of time writing a book
for a very limited market.  He deserves his wages,
and if I can't get it from him direct, I'll buy it
from Aircraft Spruce (I assume his cut is larger
with AS' markup).  Giving a workhorse his due is a
very valid concern, but 'copyright infringement' is
a red herring.