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Old 02-03-2021, 03:06 PM   #21 (permalink)
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4) In the context of EcoModder.com, I've yet to see a production automobile derived from a wing section that we might 'mod.


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Old 02-03-2021, 04:22 PM   #22 (permalink)
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derived

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Originally Posted by freebeard View Post
Your sketch best approximates the VW Drop Shape, Cd 0.16.
In plan-view, boat-tailing would begin around where the door handle is.
The tail comes to a point.
It does have an almost semicircular-radius nose in plan-view, unlike your sketch.
We have to presume that to get Cd 0.16, everything shown has to be there.
The front and rear wheel track would have to be very narrow to fit under the body.
The way Buchheim depicts the car, the driver would have a very hard time seeing out, forwards or rearwards. If the windshield embodied the compound curvature shown, it would be the most expensive piece of glass ever manufactured.
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Old 02-03-2021, 07:48 PM   #23 (permalink)
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It does have an almost semicircular-radius nose in plan-view, unlike your sketch.
The sketch is rough. I compared a 1/18th scale model. The wedge nose hides the upper door hinge and accommodates the front wheel skirts. Aft of the doors it's down to a paint stripe until the boat tail. I let go of the overall plan taper.
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Old 02-04-2021, 09:52 AM   #24 (permalink)
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Class A4? Click image for larger version

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Old 02-04-2021, 01:04 PM   #25 (permalink)
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Class A4?
Yes, actually, In my album it's titled 'localmotive'.
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Old 02-05-2021, 11:26 AM   #26 (permalink)
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Gen- III Prius as template

I give it a go.
Many carmakers are doing everything they can not to use it. Especially after 'The Simpson's' episode, on FOX Television years ago. Chis Payne paid $50,000 in royalties to use a clip of it in his 'Who Killed the Electric Car' documentary film. The cultural connection is spot-on.
Ironically, today's most expensive, and highest performance, boutique, automobiles use Toyota's profile. Even Rolls-Royce.
Every so many decades, there's a panic at the design departments. Those with a vested interest in design obsolescence, become fearful that energy efficiency requirements or public understanding will push design towards ' look-alike' cars ( ever since the mid-1920s ).
Presently, the particulars of an efficient transition to vehicle electrification poses an even stronger incentive towards ' Prius-esque' design.
HONDA Motors and the Toyoda Family were the only ones to take President Clinton's / Albert Gore's, Program for a new Generation Vehicle ( PNGV ) seriously, while legacy carmakers, correctly presumed, that they could defeat the initiative in he courts.
The Honda Insight and Prius were direct offspring of that initiative. And both carmakers clearly understood the implications of aerodynamics on performance.
Subsequent iterations of the Insight and Prius have only improved.
BEV derivatives of the two, with Tesla mirrors of the two, would come in at Cd 0.21. All skirts, active suspension would take them below that. Elongation, even lower.
I'd would be great to see the roads flooded with them. I have no illusions about that happening though. Emotion trumps reason.
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Old 02-05-2021, 12:37 PM   #27 (permalink)
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the 'template' and rear spoiler optimization/ elongation

Addressing two criticisms of the 'template,' and after reviewing observations, and spending some time chewing over the 'Logic of Port Royal,' I've come to the following:
' It is more unlikely that, the 'template' cannot be employed to define rear spoiler architecture and aft-body elongations, than it would be for it to be likely.'
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If any member or guest has prima facie evidence to the contrary, it would be a welcome addition. I have found many and varied justifications for 'not' choosing something like a 'template' tool, however, none of the justifications have anything to do with aerodynamics.
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Old 02-05-2021, 01:53 PM   #28 (permalink)
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...spending some time chewing over the 'Logic of Port Royal...'
Eh, wot?
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Old 02-05-2021, 02:47 PM   #29 (permalink)
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Logic of Port Royal

It's from 1662.
It's one of the most elegant treatises on logic I've ever seen. Right there with Ockham's Razor.
I was introduced to it in, 'The Invention Of Science,' by, David Wootton, Harper Perennial, 2015, page-463.
' the more unlikely an event, the stronger the evidence in favor of it would have to be, in order to ensure that, it was more unlikely that the evidence should be false, than that the event should not have occurred.'
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Old 02-05-2021, 07:48 PM   #30 (permalink)
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Thanx. Similar to Carl Sagan: "Extraordinary events require extraordinary evidence."

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Among the contributions of the Port-Royal Logic is the introduction of a distinction between comprehension and extension, which would later become a more refined distinction between intension and extension.[1] Roughly speaking: a definition with more qualifications or features (the intension) denotes a class with fewer members (the extension), and vice versa. The main idea traces back through the scholastic philosophers to Aristotle's ideas about genus and species,[2] and is fundamental in the philosophy of Leibniz.[3] More recently, it has been related to mathematical lattice theory in Formal Concept Analysis, and independently formalized similarly by Yu. Schreider's group in Moscow,[4] Jon Barwise & Jerry Seligman in Information Flow,[5] and others.
en.wikipedia.org/wiki/Port-Royal_Logic

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