[math-fun] I just rediscovered Alan Adler's old Aerobie aerodynamics tutorial
Oops, I must have been unclear. Baseball home run trajectories are usually longest with well *below* 45º elevation and lots of backspin. But I was thinking of cannonballs. In a vacuum, 45º is best. With air resistance, best is somewhat lower. But really long range artillery goes farther *above* 45º by getting a few miles up into thinner air. (As North Korea is threatening to demonstrate.) I was speculating that there might be a case where 45º is a local pessimum. --rwg On 2017-07-08 07:15, Fred Lunnon wrote:
This looks a good place to start answering my own question ---
https://physics.stackexchange.com/questions/200097/flat-throw-vs-45-degree-t...
WFL
On 7/8/17, Fred Lunnon <fred.lunnon@gmail.com> wrote:
Which reminds me of a recent RWG claim that a baseball travels further along a horizontal trajectory under gravity at some elevation inceeding pi/4 .
How does this come about exactly --- is upward pitching spin involved? WFL
On 7/8/17, Victor Miller <victorsmiller@gmail.com> wrote:
Yes, I uploaded it. I don't remember where I found it.
Victor
On Sat, Jul 8, 2017 at 00:50 Bill Gosper <billgosper@gmail.com> wrote:
https://www.youtube.com/watch?v=9Plt04KpoLc (Could the uploader be our own Victor Miller?) Unfortunately, the video quality is low. The high resolution master
was
discarded by a fly-by-night cassette duplication outfit in Los Angeles. If you find this video boring (as do most?), I think it's because you think you're understanding it, but aren't really. If you're young, come back to it in a couple of years. If you really understand it, it's very interesting. --rwg
You're assuming a flat earth? On 08-Jul-17 13:38, Bill Gosper wrote:
Oops, I must have been unclear. Baseball home run trajectories are usually longest with well *below* 45º elevation and lots of backspin. But I was thinking of cannonballs. In a vacuum, 45º is best. With air resistance, best is somewhat lower. But really long range artillery goes farther *above* 45º by getting a few miles up into thinner air. (As North Korea is threatening to demonstrate.) I was speculating that there might be a case where 45º is a local pessimum. --rwg
On 2017-07-08 07:15, Fred Lunnon wrote:
This looks a good place to start answering my own question ---
https://physics.stackexchange.com/questions/200097/flat-throw-vs-45-degree-t...
WFL
On 7/8/17, Fred Lunnon <fred.lunnon@gmail.com> wrote:
Which reminds me of a recent RWG claim that a baseball travels further along a horizontal trajectory under gravity at some elevation inceeding pi/4 .
How does this come about exactly --- is upward pitching spin involved? WFL
On 7/8/17, Victor Miller <victorsmiller@gmail.com> wrote:
Yes, I uploaded it. I don't remember where I found it.
Victor
On Sat, Jul 8, 2017 at 00:50 Bill Gosper <billgosper@gmail.com> wrote:
https://www.youtube.com/watch?v=9Plt04KpoLc (Could the uploader be our own Victor Miller?) Unfortunately, the video quality is low. The high resolution master was discarded by a fly-by-night cassette duplication outfit in Los Angeles. If you find this video boring (as do most?), I think it's because you think you're understanding it, but aren't really. If you're young, come back to it in a couple of years. If you really understand it, it's very interesting. --rwg
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