I don't understand how "air pressure builds up" in front of the
loop? Unless it has to do with the shape of the unrolling loop
moving from a dynamic fly leg to a static rod leg. It may
be possible that a cushion could be formed in front of the loop... like
water curling up in front of a drift boat when back-stroking, forming a
cushion? Maybe this could be clarified.
Would like to hear more about vertical stability of loops.
Back to Tim's dwg - Height of loop should be measured at the curved
portion of the loop (where he shows the air pressure build up); not the
ends of the legs.
Jim
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Jim....
I don't know if this has actually been
measured let alone documennted. Intuitively, I think that there must
be a pressure gradient at or near the leading edge of the traveling
loop. I don't know if it "builds up" or increases as the loop moves
forward.
You are probably correct about the need
to measure the diameter of the loop within the curve of the loop
itself. Having said that, I think there may be a difference in the
air resistance to the moving loop when the legs of the loop are grossly
out of parallel.
I'm not sure just what you mean by the
"vertical stability of loops." The loop itself is inherently
unstable by the very fact that it is a dynamic (ever changing)
entity.
Gordy
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Bill Howland raises a valid point about
the use of unexplained acronyms :
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Gordy,
I've been a fly fisherman for well over 60
years and an instructor for more than 20. I guess I'm stupid but I
have no idea what TLT casting is.
I really hate the unexplained use of acronyms by
people trying to look like "experts". I've never heard of TLT
casting and I'm sure I'm not the only one!!!
Bill Howland
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Bill,
Right you are ! Our mutual
friend, Tom White, was squarely in your camp on that one. He'd
say, "I don't care what you call it, just do it
!"
I also feel that as we teach fly
casting, unlike when we speak with one another, it is very poor
technique to use acronyms. The student will usually not point
out the fact that he/she doesn't know the meaning and a portion of
the instruction is lost.
I thought Misako Ishimura had
explained the meaning of the acronym rather clearly in his message
on Saturday. He translated it into English as, "Total Casting
Technique".
In the past, I have been guilty of
using acronyms without ready explanation as I made the erroneous
assumption that they would be generally understood. If ever
that happens in my Group messages, I hope someone will point it out
right away so that I can respond with an
explanation.
By way of additional
explanation, TLT refers to "Tecnica di Lancio Totale
" A supposed different method of casting touted and
taught by Roberto Pragliola of Italy.
I don't know if anyone referred to
it by the acronym "TLT" before Jason Borger did in his
text.
Raf Mascaro (also of Italy)
followed up in our next message with a more detailed explanation
based on actual experience with this school. He pointed out that
this was not accepted by most as anything really
novel.
Gordy |
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