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Groups > comp.sys.mac.advocacy > #149939
| From | Alan <nuh-uh@nope.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 11:40 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <11c03ui$3k0f7$1@dont-email.me> (permalink) |
| References | (5 earlier) <11btpvt$2qkb3$1@dont-email.me> <11btqau$2qnvk$1@dont-email.me> <11bvbnb$3a2ck$1@dont-email.me> <11c0058$3ievq$1@dont-email.me> <11c02je$3jg67$1@dont-email.me> |
Cross-posted to 4 groups.
On 2026-10-29 11:17, Tom Elam wrote: > On 10/29/26 1:35 PM, Alan wrote: >> On 2026-10-29 04:46, Tom Elam wrote: >>> 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: >> >> 1. So you think AI is right. >> >> As I said: you should quite when you're behind. >> >>> >>> 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. >> >> Ummmm....nope. >> >>> >>> 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. >> >> Whether or not you need to compromise entry changes many things, but >> for the braking phase of a corner, the object is to change the vector >> of the car's velocity in the most efficient way possible. >> >>> >>> • 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. >> >> Not during the braking phase. >> >> It changes what the precise VALUES are, but the shape is still parabolic. >> >>> >>> • 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. >> >> And that's going back to what was already wrong. >> >>> >>> • 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. >> >> And that's outside the scope of the discussion. > > OMG Fakerboy. We are talking about the racing line, not the practice or > qualifying line. > >> >>> >>> End quote >>> >>> Hmmmm >>> >>> Maybe your mistaken belief in parabolic racing lines helps explain >>> how McKay, McColl and Floer beat you so often. >> >> LOL! > > Quoting you: > > >>> 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. > > End quote. > > A parabola is a functional form for a line that can be precisely > graphed. No race car driver EVER drove a precise parabola. In Geometry 1 > I learned a line has length and 0 width. That's right, 0, not an atom, > not an electron, 0. A parabola is a theoretical geometric construct that > can be approximated in the real world. As is a circle, a square, a > hexagon, etc. > > A parabolic-like SHAPE may be correct in some special cases. For > example, your restriction to less than 90 degrees as a special case. > Even then real world differences in the car and the track (especially if > curves involve elevation and banking changes) will dictate other racing > lines. > > So do you contend that a parabolic shape is the best racing line in all > situations for all track curves? if so, prove me wrong. You just two posts ago claimed the clothoid was the "best racing line" without caveats...
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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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