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Walter,

You want to get Tony Bingelis' book "Sportplane Construction Techniques", available from the EAA for about $21.  On page 200, they have grids, side views, cutaways, aspect ratios, everything you need to design your own NACA duct.

Gary

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.