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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>-----Original Message-----<br>From: extropy-chat <extropy-chat-bounces@lists.extropy.org> On Behalf Of BillK via extropy-chat<br>Sent: Thursday, December 23, 2021 11:37 AM<br>To: ExI chat list <extropy-chat@lists.extropy.org><br>Cc: BillK <pharos@gmail.com><br>Subject: Re: [ExI] mythbusters follow-on</p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>On Thu, 23 Dec 2021 at 19:19, spike jones via extropy-chat <<a href="mailto:extropy-chat@lists.extropy.org"><span style='color:windowtext;text-decoration:none'>extropy-chat@lists.extropy.org</span></a>> wrote:<o:p></o:p></p><p class=MsoPlainText>><o:p> </o:p></p><p class=MsoPlainText><snip><o:p></o:p></p><p class=MsoPlainText>><o:p> </o:p></p><p class=MsoPlainText>> My new theory is that for the short interval of time, perhaps a coupla microseconds, there is enough air to ignite the sugar molecules, after which there is too much fuel and not enough air, so the combustion phase is short, and still would be, even if we had a way to get the baseball travelling faster than M1.5. A faster ball would have more air in the compression zone, so more of the sprinkles might burn, but the duration of the combustion might be even shorter with a faster ball.<o:p></o:p></p><p class=MsoPlainText>><o:p> </o:p></p><p class=MsoPlainText>> spike<o:p></o:p></p><p class=MsoPlainText>> _______________________________________________<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Well, you did ask ... :)<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><<a href="https://www.newsbiscuit.com/post/well-you-did-ask"><span style='color:windowtext;text-decoration:none'>https://www.newsbiscuit.com/post/well-you-did-ask</span></a>><o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>BillK<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>_______________________________________________<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Ja, the whole notion isn't particularly relevant to anything.<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>It brought back fond memories. When I was in undergraduate engineering, a new professor came who had stellar credentials: PhD from CalTech in shock wave mechanics. He was clearly very bright but wasn't a particularly effective professor for undergrads. He could see we were not impressed with him, so he uncorked a lecture I will never forget: he started into what he studied for his PhD thesis. This blew our minds and changed our attitudes. He volunteered to teach a class in compression wave mechanics, make it a one-hour upper division elective. Six of us took the class. Turns out the guy really was as brilliant as his resume, a damn good teacher when he was on familiar ground. <o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>We mechanical engineers got a bit of a complex because the electrical engineering students studied Maxwell's Equations in their last year while we went off studying mechanical properties of materials and that sorta thing. Their equations were cooler than ours. Until... we got to this shock wave class. Then the differential equations to study those things were way cooler than anything Maxwell ever thought of. A prole had to really have his differential equations and the more advanced functions going for her before she would have a chance at compression waves.<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>Speaking of which... those of you who are travelling this week by plane, if you ride a B737, try to get in seat A6 or F6. Then as you come in for a landing, sometimes a visible standing wave will form right where that leading edge of the engine where the intake cowl meets the main cowl, the silver part mees the blue part in this photo:<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><img border=0 width=225 height=289 style='width:2.3437in;height:3.0104in' id="Picture_x0020_1" src="cid:image002.jpg@01D7F7F9.8AF63E70"><span style='color:black'><o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>I included this photo because it shows something I have looked for but never seen in person: an intake vortex on a running jet engine. It requires just exactly the right conditions to form: hasta be close to the dew point on a perfectly still day.<o:p></o:p></span></p><p class=MsoPlainText><span style='color:black'><o:p> </o:p></span></p><p class=MsoPlainText><span style='color:black'>spike<o:p></o:p></span></p></div></body></html>