Walter & Group....
Syd Smith sent his answers to David Diaz who made some valuable comments. Especially to the one in red on question 18..... an oft missed concept. I have reproduced the entire "string" for you to consider. Gordy
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
----- Original Message -----From: Sydney A. SmithTo: 'David Diaz'Sent: Wednesday, December 30, 2009 1:41 PMSubject: FW: Casting mechanics ... quizHere are my answers David
From: Gordy Hill [mailto:masterstudygroup@xxxxxxxxxxx]
Sent: Monday, December 28, 2009 11:53 AM
To: Syd Smith
Subject: Casting mechanics ... quizSyd & Group...
Our new topic will be a series of topics on CASTING MECHANICS .
Let's start, as I often do, with a little quiz.
Good idea to answer with a SHORT ANSWER. Follow with a more detailed answer if you feel it is needed.
Gordy
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
QUESTIONS: Gordy - here are my answers to your quiz - Syd Smith FFFCCI
1.) Give us your description of DRIFT.
Short Answer: Drift is movement of the rod in the direction of the cast after the stop.
Expanded: It may occur on either the forward or back cast.
2.) What (if anything) can it accomplish ?
It primarily repositions the casting arm so as to be able to produce a longer casting stroke on the ensuing cast. This may be needed anticipating more power application on the ensuing cast or allowing for a longer stroke required by having shot line on the cast in progress.
It can also allow time for the fly line to fall toward the ground a bit (on the back cast for instance) to allow a higher trajectory forward cast for distance casting, maintaining the 180 degree principle. As in Joan Wulff's seesaw cast.
3.) When, during the casting stroke, is the rod tip moving at its fastest rate ? Right at RSP
4.) At what point do you think loop formation begins ? When the line begins to overtake the rod tip.
5.) What is your idea of the meaning of the term, CREEP ? Creep is described as movement of the rod by the caster in a direction opposite the cast in progress without power i.e. as the line is unrolling after the stop from the cast in progress.
6.) Do you think CREEP is always a fault ? No. But it most often is.
Expanded: Example 1: A caster has made a back cast into a strong back wind requiring a haul and strong application of power. The upcoming forward cast will require less power and thus less casting arc. The caster may "creep" to reposition the casting arm to a more comfortable position to take into consideration the decreased need for power.
Example 2. A bit tricky here (and I look forward to your input) as most often shortening the arc with the same amount of line out results in a tail, but: there is some leeway in the arc which is the result of maximal power application producing SLP (slightly larger arc) and the arc resulting from less power application and a slightly more open or domed loop (slightly smaller arc due to less power ) . So the caster could get away with slight creep to set up the shorter arc for a more domed loop. Might see this in a slack line presentation.
7.) What happens when a caster creeps ?
The casting arm moves opposite the unrolling line without power, after the stop, thus shortening the available casting stroke/arc for the ensuing cast.
8.) You have taken a high speed video of you friend's forward cast. You picked out one frame which showed the point of maximum load. How did you pick out that particular frame ?
Load = bend in rod so for a given cast the max load would represent the deepest bend in the rod since the proximal parts of the rod offer the most resistance. This will not be when the tip is moving the fastest as much of the max load is immediately transformed into rod/line speed: KE = 1/2 MxVxV
9.) When (if ever) would you purposely cast with different timing of the forward cast from that of the back cast.
As in the example above when there were a strong head or tail wind, slack line presentations, throwing heavy flies or sinking lines.
10.) You just made a forward cast .... but you didn't stop. Rather, you simply slowed your rod.
a. Will your rod unload anyway ?
Invariably (per Server Sadik's essays)
b. Was it possible to form a loop ?
It very well might be. Might not be a good loop but if the line overtook the rod tip a loop would form.
11.) What is meant by the term COUNTERFLEX ?
When under load the rod will bend or flex up to RSP. After RSP the rod bends in the opposite direction, termed counterflexion.
12.) Is it the same thing as REBOUND ?
No. Rebound refers to the opposite movement of the rod after counterflexion.
13.) You just made a high trajectory back cast. Using exactly the same rod plane, you made a forward cast with trajectory parallel to the water. What happened to the loop ?
Tailed. Violated the 180 degree principle of layout of the back and forward casts (this instance less than 180 degtrees) causing the rod tip to move in a concave path causing a tailing loop.
14.) Your casting stroke and casting arc are too short for the amount of line carried out of the rod tip. Describe the resulting loop.
There would be a concave movement of the rod tip resulting in a tailing loop.
15.) You purposely made a forward cast with increased casting arc and resulting convex path of the rod tip at the beginning of your stroke, then accomplished an almost straight line path of the rod tip until the conclusion of your stroke as you unloaded the rod with the rod tip a short distance from the oncoming line.
a. What happens to your loop ?
The resulting loop has a domed fly leg and straight rod leg.
b. When (if ever) would you do that ?
Casting heavily weighted flies or tandem rigs.
16.) At another time and under different conditions, you made a cast with an almost straight line path of the rod tip until the end of your stroke at which point you applied enough convexity of your rod tip path to unload the rod with the tip well below the oncoming line.
a. What loop resulted ?
Straight fly leg and inverted domed rod leg.
b. When, (if ever) would you do that ?
Similar situations to the above.
17.) What is likely to happen if you apply a spike of power to your haul very early in the stroke ?
A tail would result.
18.) Why ?
The spike of power pushed the rod tip down below the SLP path; the rod tip subsequently rises describing a concave path resulting in a tailing loop.
19.) Your new casting student asks your advice on what rod to purchase for his lessons. He's been told about fast action, medium action, and slow action rods. What do you advise him ?
probably a medium action rod.
20.) Give your reason (s) for this decision.
Some would depend to some degree on what he wanted to do. There are students who demand a fast action rod and are determined to learn to use it. I would advise against it, but if it's going to mean he'll practice far more diligently with what he's determined to use, I'd consider that and overline it on occasion to aid his feeling the load.
I think the important thing for a beginner is to feel the rod load which a medium and slow action rod will be easiest to feel. However you want the student to be able to use the rod in many situations and the medium action rod has the most versatility.
Gordy