Walter & Group....
From Raf Mascaro, placing "TLT" casting in perspective :
Hey Gordy,
hope you are well and enjoing fishing
You have to know I had been a SIM's instructor (SIM
Scuola Italiana Pesca a Mosca - Italian Fly Fishing School) for almost 10 years.
Roberto was the director so I guess to have a good knowledge of TLT.
First of all you said well "has engendered interest as well
as controversy over the years".
To be honest more controversy than interest.
Controversy because analyzing the TLT base on casting principles,
there is nothing new . It's more about style & variables than
fundamentals .
If tight loops,
high-speed, acceleration, casting stroke, casting plane ,trajectory, costant
tension, drift, etc... are synonimous of TLT than guys all of us are TLTaddicts
;-)
Unfortunately Roberto and most of
the guys growing up with him are convinced that TLT is the technique, nothing
else. Still using rods no longer than 8', extra-fast and stiff , always
under-lined. Flylines no heavier than #4, only DT.
Obviously : dry fly only...Last year a journalist during an
interview to Roberto asked "Can TLT be applied to nymphing ?" and the reply was
"Can nymphing be considered as fly fishing?".
The journalist said "yes of course, and streamer fishing as
well".
Some dry fly presentation casts
are interesting. Main target is always to get the fly or at least the last 10"
of leader touching the water first. Most of the cast are done with trajectory
from high back to low forward.
For any
further infos, always available
Best
Regards
Raf
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Raf...
Some things I didn't know. Thanks !
Gordy
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Wide vs. Narrow Loop diagrams
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Jim Laing has some ideas about the wide/narrow loop diagram I sent in an attachment recently :
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Gordy,
I agree with Tim Biesendorfer until he shows us
how air pressure affects the unrolling loop. I'm thinking air
pressure would affect the leading edge and the entire top leg
of Tim's loop since it's shape is parabolic. I would
agree that the 4' loop would encounter more air pressure resistance
than the 2', but the 2' loop would penetrate air more
efficiently only because the stiffer rod unloads faster resulting in
higher linespeed.
If air pressure effects the leading edge as Tim illustrates, it
will also impose surface friction on the unrolling top
leg. I'm not going to pretend to be an engineer - far from it,
but I wonder if the top leg of Tim's parabolic shaped loops were flat that
he would have less "exposure" to air pressure OR does surface
friction become more of an issue? I suspect that surface friction
behind the leading edge of the unrolling loop would play an equal
role in slowing down the flyline. Please comment.
Jim Laing
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Jim.... I think your
observations have merit. That higher loop speed is a function of
higher line speed which, in turn, is derived from higher rod tip speed
more as a vector in the direction of the target. When the rod tip
travels in a convex path, it is traveling in a segment of a circle and so
some of the energy of the cast goes in that direction (or more correctly
in multiple directions) rather
than being more concentrated in a forward direction, as I see
it.
Remember, we have form drag to consider,
as well. The more asymmetrical the loop shape (form) the greater
this resistance will be. (We've seen Caroline Gatti-Bono's paper on
this before, but I've included it as an attachment for those who may not
have seen it previously.)
Now... suppose we were casting while
standing on the Moon. We have gravity, albeit less than on
Earth. There is no atmosphere and therefore, no atmospheric
resistance to the traveling loop. From the evidence I've seen, I'm
sure that the tight, small loop would still travel faster and farther than
a wide asymmetrical loop.
Gordy
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From Jim Valle :
Gordy
and Group, I
teach the difference between a tight and large loop as being a
matter of Focus! Energy
in a tight loop is focused and therefore will go further and be more
accurate. (using my closed hand and pointing my index finger like a
pistol to demonstrate) In
a Large loop the caster?s energy is distributed around the full large
shape of the loop and therefore will never travel as far nor be as
accurate. (using my 5 outstretched fingers to demonstrate the difference)
Hope
that helps, Jim
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Attachment:
Loopdrag.pdf
Description: Adobe PDF document