....my initial reaction was as several others i.e. it didn't make sense that
the rod tip would go down. But, what I wasn't considering is that the rod
is stiffer at the butt and not as flexible. When an arc is formed by
pressure, the mid-point of the arc will be that point where the pressure up
and down is equalized...by flexibility and by weight. If that's true, then
the "mid-point" of the arc is more toward the butt of the rod. Which means
that the arc on the front half of the rod is a longer arc and has more rod
length involved. It makes sense to my one functioning brain cell anyway.

Barry

"Jarmo Hurri" wrote in message
...

Robert He used an example that if one held a fly rod rod truly
Robert horiz., and gave the handle a very quick upward (I think he
Robert means backwards; toward ones head) pure rotation, the tip
Robert momentarily goes Downward.

Robert Does it ?

According to Don Phillips' "The Technology of Fly Rods" (page 87), yes
it does. He says that he demonstrates this by having someone hold a
piece of paper rear of the stroke direction and then initiating a cast
with a rapid pulse (it does not have to be up, sideways will do as
well). If you are interested in this, I think it is relatively easy to
make a convincing experiment to confirm this.

Phillips also says that this phenomenon has practical importance: if
you initiate a cast too quickly, it will cause slack.

Robert Why does it, if so ?

I have some guesses, but since I am not a physicist I will pass and
leave this issue to be resolved by someone more educated.

--
Jarmo Hurri

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