Critique 5 / Polar bear fishing

Interesting quiz. I expect I may have missed something, not being an engineer, but I maintain that acceleration can be constant, but the end speed is greater, and we may be discussing one when we mean the other. Gravity is another great example. 32.2ft/sec/sec is the contant, but the farther you fall, the faster you go.

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Well..... as long as we have any acceleration, the end speed must be greater than it is at any prior point on the curve. This would be true whether the acceleration is constant (as it is with a falling object) or not.

We interpret the graph rendered by the Casting Analyzer (slope and curve) as acceleration even though the rate of angular change is being measured at the rod butt. This is not the same thing as acceleration of the rod tip.

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A couple of years ago there was a big discussion on Sexyloops about the 170 distance stroke and I put a series of photo's up to illustrate that the loop was not formed at RSP but was actually propagated from the point where the rod tip started to deviate downwards from SLP. I think I also noted that the proportion of the stroke that coincided with SLP was less than half of the overall tip travel. I drew the conclusion that SLP just needs to be a portion of the overall tip travel to set the line on the desired trajectory. Loop size would be determined by how much we drop the tip below SLP after the trajectory had been determined.

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Mike... I didn't see those photos. Wonder if they were from Lovoll's group ?

I think you may be right about the straight line path being needed during part rather than all of the stroke; the portion closest to the rod straight position through which the tip passes.

I also agree that one way of looking at the determination of the size of the loop is that is in large measure the distance that the rod tip is at RSP from the oncoming line as that line starts to overtake the rod tip. (How far below it when casting in the vertical plane.) I find students understand that very well. "Pull that tip way down and you get a big loop - Dip it down just a little and the loop is smaller ". As Lefty once taught: Dip the tip down a "frog hair" for a tight loop.

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Of course at the time I ask about continuous vs constant base on a thread from one of our members which unfortunately I can not remember who it was. Tried to look back on past threads but could not find it. But I keyed in on the word "Continuous" being used instead of Constant by this member when teaching. Both words have merit, but may not be needed.

I think smooth Acceleration may be enough to explain the task. Constant or Continuous may be to confining for this subject in my opinion. "

Gary....

I suppose that constant acceleration would necessarily be smooth. Not sure that smooth acceleration, however, needs to be constant. The term constant is not only "confining", but very specific. I look at it as meaning a steady rate of increase in velocity. I do think that was Bruce Richard's intention.

Also, seems to me that we can have continued and continuous acceleration without it being constant. For example, we might have accelertion which is unceasing and therefore continuous but with a smooth, changing rate of velocity such that it is not constant.

A two asperin concept !

Gordy

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POLAR BEAR FISHING

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Jim Phillips send this video of "Polar bear fishing". I placed video in an attachment after asking Jim if they finally landed the bear.

Gordy

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