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Walter & Group...
[GH] From Joe Libeu :
Gordy,
When we are ACA casting we hover the fly for accuracy. This could be the same as hang time.
Joe
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[GH] Agree.
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[GH] From Walter Simbirski :
Hi Gordy,
I view hang time as the amount of time it takes for something to fall to the ground. It may involve traveling upwards
and then falling down, such as when a basketball player makes a jump shot, and it may involve lift/drag as discussed
in Dr. Perkins paper.
I know that when the term is used in basketball to imply that the athlete appears to hang in the air longer than would be
expected by simply jumping up and down but from a pure physics view it is just the time in air with or without lift or other
strange phenomenon.
There is some ongoing discussion on Sexyloops regarding various phenomenon that make a traveling loop fall to the
ground more slowly than a line that has been dropped. I'm not going to bias the thoughts of this group by saying there
is no such thing. There is, in fact, some interesting discussion happening there. What the final outcome is remains
to be seen. I'm sure Paul and/or I will be happy to provide updates as things evolve.
Cheers!
Walter
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[GH] Walter,
We'll appreciate your updates.
I've noted that weather conditions can make the fly line seem to "hover" and fall at an unexpected slow rate.
Turbulent winds and static electricity near thunderstorms can do some strange things including this as well as leading to bizarre rod tip vibrations and humming as well as crackling noises.
Once, when casting during a T-storm (Bad judgement !) my fly line loop straightened and the line never did fall until I added slack !
There are probably other factors I haven't considered.
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>From Scott Swartz :
Gordy,
Is it conceivable that the energy and momentum of an unrolling and straightening loop could stretch the line? During the stretch and subsequent recoil would the line appear to be “hanging” prior to reaching an unenergized length and falling with gravity? Perhaps some of our engineers could enlighten us if this expending energy could thwart the effects of gravity momentarily.
Scott
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[GH] Scott,
Without experimental data, I must say that I don't know.
One could devise a simple experiment .... something like this :
Make a series of defined length casts using a line with zero stretch while measuring the time of line descent. Repeat, using a line which has great stretch capability. By comparing the results, we'd at least have a rough idea of whether or not line stretchability is a significant factor.
Some interesting things happened when distance casters Steve Rajeff, Tim Rajeff, Chris Korich and Bruce Richards tested highly stretchable lines about 10 years ago.
Bruce Richards wrote : "By the time the rod tip stopped on the final forward cast, the line had stretched to a significant degree. After the rod tip stopped and the loop was formed, the tension was released from the line. It then relaxed and 'accordioned', forming a series of S curves in the top leg of the loop. These curves were wind resistant and the lines didn't travel very far. When we built the lines on a core with less inherent stretch, the problem was solved; in their first year these new lines broke all the world distance records. Energy can be stored in a stretched fly line, but that energy cannot be well controlled as the loop travels forward, thereby disrupting the cast. " *
Tim Rajeff wrote : ""We always found that the lines that were the most stable in the air during the cast were the ones with the least stretch in the core ........ So the less stretch your line has, the more stable the loop is in the air and the farther your cast will go (all other things being equal) " *
As these trials were made, there were no published measurements of rate of line fall.
* How Does Line Stretch Affect the Cast, by Bruce Richards & Tim Rajeff, The LOOP, Winter, 2002, p.1-2.
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