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## Search found 1472 matches

Sat Feb 09, 2013 4:06 am
Forum: Flycasting Physics
Topic: SHO and forces
Replies: 49
Views: 16037

### SHO and forces

Walter

You cannot answer, can you? If you can you will guess what Gordy was meaning.

An easier one: what happens if the point on the left travels at constant speed? Does the spring stretch or not?

Merlin
Sat Feb 09, 2013 2:52 am
Forum: Flycasting Physics
Topic: SHO and forces
Replies: 49
Views: 16037

### SHO and forces

Walter

Let' see further on: what is happening if F1 is constant?

Merlin
Fri Feb 08, 2013 8:03 pm
Forum: Flycasting Physics
Topic: SHO and forces
Replies: 49
Views: 16037

### SHO and forces

Walter http://img835.imageshack.us/img835/8968/springmass.jpg From top to bottom (if I did not fool myself) Situation at the excitation point Situation for the mass Situation for the spring Newton’s equation to describe the motion of the mass It is easier to know a description of the input motion (α...
Fri Feb 08, 2013 7:29 pm
Forum: Flycasting Physics
Topic: Spanish experiment
Replies: 147
Views: 39073

### Spanish experiment

Hi everybody Speculating on gut feelings is troublesome, here is the acceleration profiles corresponding to post number one: http://img715.imageshack.us/img715/4368/accelprofilespanish.jpg You can pick up the point that fits with your conviction, but this is how it looks like for a rather well tuned...
Thu Feb 07, 2013 7:13 pm
Forum: Flycasting Physics
Topic: SHO and forces
Replies: 49
Views: 16037

### SHO and forces

The first question to answer is: which system (object) are you studying? The spring? The mass (is it supposed to be the representation of the line?

Then you can start illustrating the forces applied to the object and apply Newton's law

Merlin
Tue Feb 05, 2013 5:01 pm
Forum: Flycasting Physics
Topic: Spanish experiment
Replies: 147
Views: 39073

### Spanish experiment

Alejandro,

Congratulations for making the experiment real and exploring the intricacies of the system. Yes, the string can be better than the spring and vice versa, it tells you that there is an optimum somewhere, and that our rods are optimized (up to some point) to make casting easier.

Merlin
Mon Feb 04, 2013 5:11 pm
Forum: Flycasting Physics
Topic: Spanish experiment
Replies: 147
Views: 39073

### Spanish experiment

Hi Vince My model is not "static" or I do not understand what you mean. You can change the input (red lines) by playing with angle, timing, and symmetry of the cast. You apparently succeded in changing the frequency input to show an example with a very soft spring (beware of the absolute deflection,...
Sun Feb 03, 2013 3:06 pm
Forum: Tackle
Topic: SexyLoops Hot Torpedo - Instructor Rod
Replies: 76
Views: 16760

### SexyLoops Hot Torpedo - Instructor Rod

Yes, saving the database is a perequisite. I am currently trying to link the static evaluations (as Bill's one or mine, or anyone else if possible) to dynamic conditions. After all, the fit is a question of dynamics that we would like to be translated into static for practical reasons. It may take s...
Sun Feb 03, 2013 6:26 am
Forum: Flycasting Physics
Topic: Spanish experiment
Replies: 147
Views: 39073

### Spanish experiment

Hi Aitor

Yes it´s correct and the outcome varies with the parameters of the experiment. It will be interesting to see how the various elasticity of your "springs" affect the results of your experiment.

Merlin
Sun Feb 03, 2013 6:19 am
Forum: Tackle
Topic: SexyLoops Hot Torpedo - Instructor Rod
Replies: 76
Views: 16760

### SexyLoops Hot Torpedo - Instructor Rod

Torsten, I brought some confusion with a provocative proposal but I can see that now everyone has an illustration of why the current methodology must be more specific: you have to define the way you clamp the rod. Even the two points method may give different results than a real clamp. So now imagin...