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Walter & Group....
From Gary Carlson:-
On Sep 2, 2008, at 1:13 PM, Gordy Hill wrote:
>
> My reply, designed to simplify a concept which, frankly, is not easy
> for all to understand :-
>
>
> Lewis....
>
> Try to move your rod with no rotation at all. Your hand moves at
> exactly the same rate as your rod tip.
>
> THIS IS TRANSLATION.
>
>
>
> Now, keep your hand in one place. Rotate at the wrist. Your hand
> didn't move forward or back at all .... but your rod tip moved a
> long way.
>
> THAT IS ROTATION.
>
> Another way to look at rotation is that it achieves ROD ARC. This
> is the change in the angle of the butt section of the fly rod from
> the beginning of the cast to its end.
>
>
Gordy...
However, with pure TRANSLATION the rod tip doesn't necessarily move at
the same rate as your hand, depending on the amount of force applied.
Greater force will cause loading of the rod with deflection of the rod
tip, perhaps even creating a small concave arc. It would also depend
on the flexibility of the rod. Or am I taking this theory too far and
adding more confusion?
Gary
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Gary...
In the real world of fly casting, pure translation will result in just enough acceleration to bend the rod tip against the inertia of the fly line ...... BUT NOT MUCH .... because the caster cannot achieve enough acceleration with translation alone (with no rotation mixed in) to cause much bend.
The more limber the rod, the more it will bend with very little acceleration, true.
A concavity of the rod tip path can result if the caster could make an explosive translation move. That would be a bit of a trick... not easy to demo, but possible.
In my answer to Lewis, I was taking translation out of the complicated real world so as to isolate it in order to emphasize a point. It's a little teaching trick which often works. This is simply picking one of the component parts of a complicated system of many interrelated functions and looking at it all alone.
Gordy
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From Dennis Grant :-
A seemingly simple question may be asked to an MCI candidate, the answer needs brevity and clarity.
We need to be careful when we apply an ‘absolute’ to casting ! Our definitions, in most cases should consider the ‘art’ and avoid the ‘science’
For example. It was so much easier for us to say ‘STROKE: the DISTANCE the hand moves from the beginning to the end of a cast. POWER SNAP or WHUMMP: the final acceleration of the rod, normally with the movement of the wrist that ends in a STOP’
WHAT THE WORLD HEARS :
TRANSLATION:
(Dictionary) “the rendering from one language into another” or maybe “Uniform motion of a body in a straight line.”
ROTATION:
(Dictionary) – “One complete turn”
The CI/MCI hears
:
TRANSLATION: Linear (straight line) movement of the casting hand and the fly rod tip with no change in the angular position of the butt section of the rod from beginning to end.
ROTATION: Rotary movement of the casting hand and rod butt with no linear (straight line) movement, yielding change in the angular position of the butt section of the rod from start to finish.
The picky stuff: The fly in the ointment is “BUTT SECTION”, to most of us that means the lower section of the rod to which the reel is attached. In the definition the ‘BUTT’ refers to that part of the rod below the rod hand.
WHAT I WANT A NEW CASTER TO
HEAR:
Short cast ‘lift rod tip smoothly and flick the wrist’ and ‘For more distance, stroke the hand back on a climbing plane, the longer you can WAIT before applying wrist movement the smoother and more efficient the cast will be.
1. Is there any 'translation' during the pick up cast ? YES, USUALLY, NOT NECESSARILY
2. Can there be ? YES
If there is rotation during translation it’s not translation !
Certainly an easier question as it relates to false casting !
I asked the group the question for a reason, not the least of which were:
1. Lets make sure we have a common understanding.
2. I bet all of you sat in front of your computer and made your ‘hand and index finger casts’ as you thought, yes, no, and maybe !!
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Dennis .....
One can look at this and other elements of the fly cast from the point of view of the theorist, the poet or the physicist / mathematician.
You have taken the position of the true teacher of fly casting !
Thanks for putting it in perspective.
Gordy
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