OK, so my last comments in this thread: a rod can start unloading before the end of acceleration, it is a matter of a few 1/100 seconds and nobody cares but me. Merlin - F=ma In this case the F can be measured by the bend in the rod (remember all the times I've said that the rod, although not linea...

Walter, There is always air drag, on the rod and on the line Merlin - that is what we call assumptions. We assume the model includes air drag or we assume the model does not include air drag. We state these in the description of our models as I did. Why would we leave air drag out of a casting mode...

I think one of the mistakes made by myself here is showing the results of the model for situations that are a million miles away from a cast. For example, the answer I gave for Aitor's experiment showed an oscillating result. However look at the time base, I plotted this out to 6 seconds (I don't k...

When you mention you can maintain a deflection by moving along a rod, you are in a translation situation: the rod is in a steady state and is bending by inertia (rod, line) and air drag; it will unload if you stop moving it. In the absence of air drag during a translational movement it is not veloc...

It depends. I can use it as a 1st class or a 3rd class depending on how I apply force. I can also switch between the two during a cast. I can also switch on the forward and backward strokes. I'm sure there are a number of people who will say that there is only one proper way to maximize efficiency ...

Yeah - he's strangely quiet about that just like he is about Newton's laws being breakable. Unfortunately he is unable to edit away those statements at this point. We've discussed the effects of effective rod length on the third class lever. The question that goes along with that is how the ability...

Marc - a third class lever is defined as follows: A lever in which the effort is placed between the fulcrum and the load. We usually consider our elbow as the fulcrum, the load is the line, and the point where effort is applied is our hand. Given this the rod is always a third class lever whether i...

Rotate the rod, tip travels further than the butt in the same time and therefore faster...completely get that. True if its rigid...not true if it's bendy apparently... I don't get that at all... The reaction of the tip to a forcing function at the butt can run an entire gamut of scenarios. For one ...

Merlin wrote:Yes Walter, thanks for correcting me

You are welcome. I know you know what you meant so I apologize for being nit picky but somebody has to do it.

Merlin wrote:The brick will take off at maximum car acceleration

Did you mean the brick will take off at maximum car velocity?

Merlin wrote:Correct Walter, now we can question how a dispute could end. Anyway the lever must be made of wood, no plastic allowed. It would not be so easy to tune the lever arm in that case.

Actually it would be pretty simple and well within the technology of the time when trebuchets were in fashion.

Merlin wrote:If it is stiff it may unload before the end of the acceleration of the car.

If it fully unloads then the car is no longer accelerating.

Counter weights can not include springs, explosives, electrical devices, elastic material, flexible arms or deformed components which store energy. That applies to the counter weight specifically. Is there a similar restriction on the throwing arm? I think Aitor's question is whether a flexible thr...