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Walter & Group....
>From Peter Lami,
Gordy,
This is the penultimate message to the Master Study Group regarding the application of power and how it correlates to rotation.
My sincerest thanks to to you, Bruce Richards, Grunde Løvoll, Server Sadik and so many others who regularly contribute to the Group. Also, special thanks to Mike Heritage for scrutinizing our every word. MIke, you make us better!
Peter Lami
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On "constant acceleration" from Paul Arden :
Hi Gordy,
I have issues with the "constant acceleration" concept that is being thrown around. For my distance casting with the analyser the acceleration was certainly not constant, anything but in fact. Also I have yet to see an analysed cast that has truly constant acceleration.
I don't actually believe that we ever have constant acceleration, and I can't think of any reason why we would actually want this. What we actually want for distance is maximum rotational velocity at the correct time. Constant acceleration IMO is a red herring. I much prefer your accelerated acceleration idea that you held previously. My cast bears that out and that would be delayed acceleration when contrasted to constant acceleration.
I would be very interested for Bruce to feed a constant acceleration into his casting robot and to see the results. The tools are available.
Cheers, Paul
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[GH] Paul,
As you know, you are not alone in challenging the idea of constant acceleration.
My subjective "feeling" has been that when I make my most gratifying distance casts, that I'm accelerating at more than "constant"..... but it's hard to argue with hard data since I haven't done any of the tests and therefore have no data of my own.
This was why I came up with the term, "accelerated acceleration"....a few years ago, until our physicists told me that this was an incorrect term. One of them informed me that since acceleration is a rate of change, that you can't really have a "rate of a rate". Another informed me that in order to have a progressive rather than a constant acceleration that it would be called, "third order progression".... a term rocket scientists use to explain the change of acceleration of rockets.
My thought is that the concept of constant acceleration really came from Bruce Richards' and Noel Perkins' interpretation of the main body of the acceleration curve on the readout of the Casting Analyzer. Of course, the whole "curve" can't be a straight line. All this may have to do with the way these analyzer readouts are interpreted (???)
I'd like to get more deeply into this with informed opinions from others ..... but can't do that right now because I'm about to leave for the Conclave.
If we cannot agree on just what form of acceleration we're dealing with, then I don't see how we can use this information as we teach students....... except, perhaps, as we compare one caster's CA curve with another's as we critique the quality of their casts.
Hope to see you there !
Gordy
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