Physics of fishing
at http://www.washtimes.com/metro/20050...0210-5222r.htm

" Ideally, the energy directs the fly to the target, he says. The
most efficient way to accomplish that goal is through a straight line
path of the rod tip.

"If the rod tip doesn't travel in a straight line path during the
cast, it either becomes convex or concave. A convex path of the rod
tip creates a wide, inefficient loop."

The rod tip becomes convex or concave? Wow!

Aside from that second paragraph's being an example of damn poor
writing (not extraordinary for the DC Times), the whole quotation is
nonsense.

I'll wager that there is no one in the entire world whose rod tip
describes a straight line when he or she casts.

Assuming the rod maintains a constant length during the cast, which is
the case with most rods I've seen, the tip follows an arc, not a
straight line.

vince