Here are links to 2 yahoo groups concerning a-cats.  The first is to a site for anyone who wants more information about the Lindahl & Roake LR2 A-Cat built by John Lindahl of Lindahl Composite designs.  The second is specifically dedicated to A-Cats in general.  It is an interactive site that anyone can post, change or modify the information as needed.

http://groups.yahoo.com/group/LR2ACATS/

http://groups.yahoo.com/group/A-CatWorld/