Acceleration

Simbirski  & Group.........

From Bruce Richards on Steve Hollensed's message:

Steve has a very good handle on the relationship between speed and

acceleration, which many instructors lack. Words we've all used since we

were kids, but mostly misused.....

Bruce

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From Bob Rumpf :

Hi Gordy & group,

 

I have been carefully reading and hopefully assimilating everything being discussed lately related to acceleration. I still think the term "accelerating acceleration" (Gordy's) is about as close to descriptive as you can get no matter how you break it down. Looking at this with an uncomplicated approach, (which in reality is the way we have to teach if we don't want to put our students to sleep), the stroke begins from a standstill and ends up moving considerably faster to the stop. The fact that it should be a smooth move is a given, but to move faster we do have to accelerate the movement, and while we are accelerating we are eventually moving even faster. Now if that isn't a perfect example of "accelerating acceleration", I surely can't think of a better one. This is just one man's opinion, but this is the way I explain it to my students, it works for me, and nothing succeeds like success.

 

Bob Rumpf

 

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Bob .....

 

That was my thinking in the past.  Having studied Bruce Richards' Casting Analyzer acceleration curves, it now appears to me that we have some degree of increasing acceleration at the start of the rotational phase which rapidly give way to almost constant acceleration to the, "stop".  Even the stop is not a, "brick wall stop", but a rapid negitive acceleration or, "deceleration".  This seems to yield the best loops if our goal is that of tight loops with parallel loop arms.  Seems to me that to make other kinds and sizes of loops, we'd use different acceleration curves.  I don't know that this has been studied....but it soon will be.

 

Gordy

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