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Groups > comp.sys.mac.advocacy > #149932
| 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 10:35 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <11c0058$3ievq$1@dont-email.me> (permalink) |
| References | (3 earlier) <11bsv25$2fiio$1@dont-email.me> <11btgii$2mqm5$1@dont-email.me> <11btpvt$2qkb3$1@dont-email.me> <11btqau$2qnvk$1@dont-email.me> <11bvbnb$3a2ck$1@dont-email.me> |
Cross-posted to 4 groups.
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. > > End quote > > Hmmmm > > Maybe your mistaken belief in parabolic racing lines helps explain how > McKay, McColl and Floer beat you so often. LOL!
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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. 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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