"Dudley Henriques" wrote in message
news
We define
The angle of incidence would be the angular difference between the
longitidunal axis of the airplane and a line drawn through the leading and
trailing edges of the wing.(Chord Line)

That was how I have always defined the term, Kermode calls this the riggers
angle of incidence and says it is a left over from rag wing biplanes that
adjust the riggers angle to tune handling. It is my understanding that some
ac have slightly differing angles of incidence on each side.

Blue skies to all