Walter & Group....
From Aitor Calderon :
Does efective rod length actually diminishes during a cast?
http://www.revver.com/video/314935/paradigm-long-cast-1/Aitor
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Aitor...
Good call !
(I was not successful in opening the link.)
Technically, NOT if we go by the definition of effective rod length as: The chord subtended by the arc of the fully bent rod.
Key word is: "fully".
Each rod would then have a fixed effective rod length. * **
* IN THE RING OF THE RISE, by Vincent C. Marino, 1976, pp. 52, 53.
** THE TECHNOLOGY OF FLY RODS, by Don Phillips, 2000, pp. 45 - 47.
This is an important concept. It explains why a stiff short rod of say 8 1/2', may actually have an effective rod length greater than a more limber rod of 10' overall length.
Gordy
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Hi
Gordy,
The link that Guy
kindly provided showing Grunde Lovells Supersonic Backcast video is an extremely
good illustration of what I described in my previous message.
The line projects
backwards in the direction of the straight line portion of the stroke because
that?s where it got its inertia from and at RSP the rod tip direction is about
90 degrees to the line projection and therefore it makes absolutely no
contribution to line velocity at that point. Similar situations occur to varying
degrees on many occasions, usually much less exaggerated than that shown in this
example in many of the casts that we make and especially in longer casts.
We have to be very
careful not overestimate the importance of where the rod tip moves fastest
or the proposition that the loop always forms at RSP because clearly it does
not. It is probable that in some instances the rod tip does useful work and is
pulling the line when it is travelling at its fastest and it?s possible that the
loop occasionally forms at RSP and the clearest example of both is a negative
cast. However it does not do so on every cast as some might
suggest.
Looking closely at the
video it appears that the forward travelling line track intersection with the
rod track remains surprisingly stable which indicates that the ?line? inertia
was gained from that portion of the cast as Guy suggests, maximum ?line? inertia
of course occurs at maximum velocity and that?s where I would suggest that the
loop actually commenced ? somewhere close to the rod tip track and line track
intersection.
Best
wishes,
Ally Gowans
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Ally... To me, it nonetheless still fits the simplified concept that loop formation happens when the line begins to overtake the rod tip.
If we relate it to rod bend, it is somewhere very close to the Rod Straight Position # 1.
As I go over in my mind the studies already done on this including my own and the information we have received in our messages, I wonder if it may sometimes be prior to actual RSP 1 and sometimes after, depending upon the cast and the characteristics of the fly rod.
Gordy
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HISTORY, CASTING INSTRUCTOR CERTIFICATION PROGRAM / CASTING BOARD OF GOVERNORS
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From Ed Chamberlain :
Thank you Gordy.
This is different than last version I viewed. Interesting, and excellent
job compiling by Macauley. Appreciate the quick response.
Eric Cook is organizing the testing for the upcoming SE
Conclave to be held at Unicoi State Park, GA next weekend. Last report we
are testing 9 CI candidates and 2 MCI candidates so GA and the SE continues to
progress in our quest for casting / teaching excellence. Eric has done
great job pulling it together. Should be excellent venue.
Additionally, and in spirit of the CICP, David Diaz and his quest for
contiinuing education has gathered some notables, Dusty Sprague and Joe Libue,
to name a couple, to participate in a "pre-Conclave" day of continuing ed for
instructors to discuss standardized testing for MCI and CCI. All good and
makes a worthwhile Conclave.
Best, Ed
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From Jim Valle :
Gordy
and Group.
Re
CI Workshops
For
Ed and future candidates there is a wealth of approved and prepared information
on the FFF website under the instructor certification tab.
Lots
of presentations, handouts and even timed curriculum?.
The
issue of teaching our Masters and providing them with all the information
necessary to fulfill their responsibilities as Masters is a pet peeve of mine
and we are working on it?.
Hope
this Helps,
Jim