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Groups > comp.sys.mac.advocacy > #149924
| From | Tom Elam <thomas.e.elam@gmail.com> |
|---|---|
| Newsgroups | comp.sys.mac.advocacy, comp.sys.mac.system, comp.mobile.android, misc.phone.mobile.iphone |
| Subject | Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. |
| Date | 2026-10-29 07:46 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <11bvbnb$3a2ck$1@dont-email.me> (permalink) |
| References | (2 earlier) <11bo6gc$rokf$1@dont-email.me> <11bsv25$2fiio$1@dont-email.me> <11btgii$2mqm5$1@dont-email.me> <11btpvt$2qkb3$1@dont-email.me> <11btqau$2qnvk$1@dont-email.me> |
Cross-posted to 4 groups.
On 10/28/26 5:43 PM, Alan wrote: >> You corrected me on the local rules and I accepted and respected your >> reply. > Only after arguing it ENDLESSLY. > > I'll tell you one little thing: > > The line IN to the middle of a corner... > > ...from braking to speed necessary to simply negotiate it... > > ...forms a parabola... > > ...for any corner up to 90 degrees. NO! It's a lot mope complicated. Google "is a parabola always fastest racing line" please. But you won't, so I will save you the trouble: Quote: No, a parabola is not always the fastest racing line. While a symmetric parabolic line (often associated with trail braking into a pinched corner and an early throttle-out) works well for certain isolated or specific turn types, the absolute fastest racing line depends heavily on the context of the track. Why a Parabola Isn't Always Fastest • Corner Isolation vs. Sequences: A geometric or parabolic line assumes a corner exists in complete isolation. On a real track, corners connect to other corners, hairpins, or straights, meaning you must compromise entry or mid-corner speed to maximize acceleration onto the most important or longest straight. • Car Performance and Power: For low-power cars, prioritizing a late apex to get on the throttle earlier outweighs maintaining a smooth parabolic mid-corner speed. For high-power or heavy cars, the physics of weight transfer and tire grip change the ideal curve. • Alternative Mathematical Curves: True mathematical optimizations for race tracks frequently use Euler spirals (clothoids) or compound curves rather than a simple parabola to transition smoothly between straight-line braking, steady turning radius, and full-throttle exit. • Defensive Driving and Traffic: Real-world racing requires adjusting lines to block competitors, avoid marbles/debris off-line, or manage wet weather grip, overriding pure theoretical geometry. End quote Hmmmm Maybe your mistaken belief in parabolic racing lines helps explain how McKay, McColl and Floer beat you so often.
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How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-23 13:00 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-26 07:38 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-26 11:55 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-28 09:19 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. -hh <recscuba_google@huntzinger.com> - 2026-10-28 11:37 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-28 17:32 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. -hh <recscuba_google@huntzinger.com> - 2026-10-29 07:50 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-29 13:55 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. -hh <recscuba_google@huntzinger.com> - 2026-10-29 16:38 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-30 10:27 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. -hh <recscuba_google@huntzinger.com> - 2026-10-30 11:54 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-26 11:49 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-26 11:34 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-28 09:58 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-28 11:57 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-28 17:38 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-28 14:43 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-29 07:46 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-29 10:35 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-29 14:17 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-29 11:40 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-30 10:41 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-30 10:24 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-30 14:39 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-30 11:57 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Tom Elam <thomas.e.elam@gmail.com> - 2026-10-31 21:18 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-31 20:14 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-29 11:14 -0700
OT: And the coward ducked out of this one... (was Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Alan <nuh-uh@nope.com> - 2026-10-30 10:26 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. "Joel W. Crump" <joelcrump@gmail.com> - 2026-10-27 18:15 -0400
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Brock McNuggets <brock.mcnuggets@gmail.com> - 2026-10-27 15:56 -0700
Re: How badly Arlen/Maria gets it wrong: the catenary curve and road racing. Chris <ithinkiam@gmail.com> - 2026-10-28 08:08 +0000
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