Al...
One more example of a bent rod which is not a loaded rod, is found in the bamboo fly rod which has been stored improperly, and takes a, "set". This is because the gentle forces bending it while stored have stored energy in that rod which has gradually dissipated as the fibers of which the rod is made lose some of their modulus of elasticity and deform permanently.....THAT stored energy is released gradually over a period of weeks , months, or even years. Even that rod was loaded up to the point that the energy was released by permanent deformation of it's fibers.
Here's an experiment which any one can do to prove that there IS force applied to the tip of the rod after the RSP resulting in a forward bend of the rod during counterflex. :
Make as long a cast as you can. Measure the distance achieved.
NOW......Cut your line just behind the point where you hold it with your line hand during your haul.
Make another long cast. YOU WILL PROBABLY ABOUT DOUBLE YOUR DISTANCE as the fly and line segment sail off to Kingdom Come !
What you did by cutting the line, was to minimize that very moment of inertial resistance which contributed to the forward bend of the rod tip after the stop as you decreased the resistance to the flight of the line by the rod guides and tip top and that of the additional mass of the line behind your cut.
Now take a fly rod with no line. Make a, "cast". You will bend the rod on your forward stroke. At the RSP you will still note some counterflex and rebound. There was no fly line to provide resistance, but that rod was loaded against a combination of air resistance and the internal resistance of it's very fiber construction. If there were no resistance either externally or internally, the rod wouldn't bend at all, and you would have no load. Depending upon the degree of force applied, you would start to get into the first period of frequency or even the second period of frequency oscillation......and the rod would be poorly damped so that it would vibrate in the plane of your application of force.
The very fact that we have rebound after counterflex is proof that energy was stored in the rod during counterflex and released as the rod straightened during rebound. For an instant, that was stored energy in the counterflexed tip.........ie., LOAD.
In the event that you took all the time to go into that on a Masters exam, you would bore your examiners to the max. To do so as a rebuttle to what you may have been told at the time would be tandamount to argument.....NEVER A GOOD IDEA !!
Gordy
From: "Allen Crise" <flysoup@xxxxxxxxxx>
To: "gordon Hill" <hillshead@xxxxxxx>
Subject: need help
Date: Tue, 15 Nov 2005 20:27:18 -0600
Howdy Gordy.This is on the FFFCCI website From one of my students. So I do not feel I should answer.I was a taught a bent rod is a loaded rod. Now at my testing I was
told that was not the case. I was given the example of the rod tip
dipping after the stop is not a loaded rod.
Ok if the only thing a rod can do on it's own is straighten out, and
at the point after the stop when the rod dips it is a bent rod is it
loaded? Remember I didn't say "usable load" or "completely loaded"
Is a bent rod a loaded rod?
Would you consider the rod to be partially loaded if it is bent in any
direction, or just a usable direction?
I am trying to get a final answer or clarification of this so as not
to teach it improperly.
Thanks for the help guys and gals
Dave
ol ALAllen Crise FFF Master Casting InstructorSOC VP of EducationHawk Ridge Flycasting School2508 A County Road 1011Glen Rose, TX 76043254-897-2045geocities.com/rrdoctorflysoup@xxxxxxxxxx