About 15 or 18 years ago, I had the greatest handbook with a million "rules of thumb" concerning aerodynamics. Well, I loaned it out to "someone" and never got it back. Over the years I have tried to find another one and have purchased several books that are so mired in theory as to be nearly worthless. This book had lots of illustrations and simple ways to calculate or extrapolate down and dirty solutions. It was a fairly small paperback. Anybody know what book I am thinking of ?