04-12-2020, 04:47 AM
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#201 (permalink)
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The incredible trick that Porsche did to reduce cooling drag to near-zero.
No shutters. And the cooling system working at full power!
I'd never previously seen this described.
https://youtu.be/AAYqrDUxTiY
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04-12-2020, 01:37 PM
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#202 (permalink)
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That's pretty genius. On their first water-cooled 911.
They quantify the cooling system drag. Does that include (one wonders) the benefit to overall drag from the wheel deflectors?
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04-12-2020, 05:49 PM
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#203 (permalink)
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Quote:
Originally Posted by freebeard
That's pretty genius. On their first water-cooled 911.
They quantify the cooling system drag. Does that include (one wonders) the benefit to overall drag from the wheel deflectors?
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Yes it does. |
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04-14-2020, 07:14 PM
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#204 (permalink)
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https://youtu.be/cOpuT10kDPw
Interesting rear aero on the latest Porsche Cayenne.
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04-14-2020, 08:32 PM
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#205 (permalink)
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Could you post the graphic at 1:39 as a still image? For posterity.
This is relevant to my interests, I paused the video and went out and measured my Dasher 3-door: 28°. I'm hoarding some textured aluminum sheet big enough as needed, I've been thinking about a J-shaped edge that would slip over the whole hatch on three sides. I don't envision a problem with visibility.
I'd been thinking about rear-slanted 'D-pillar spoiler's. This confirms it. I think of it as a boxed cavity. Looking forward to the diffuser part.
It's radiator is next to the left front wheel. Twice as good, but half as much, air curtain?
The active spoiler might be helpful with two positions, eco and airbrake. Sort of a third brakelight semaphore. I wonder how to get that without drilling glass or metal.
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04-14-2020, 08:36 PM
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#206 (permalink)
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Note: 1/3rd scale model, not full-size car
Last edited by JulianEdgar; 04-14-2020 at 09:21 PM..
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04-17-2020, 04:00 AM
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#207 (permalink)
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On-the-fly height-adjustable suspension has enormous aerodynamic advantages for those chasing best aero outcomes.
https://youtu.be/rN5nOCsLUUw
Last edited by JulianEdgar; 04-17-2020 at 04:41 AM..
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04-17-2020, 04:38 AM
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#208 (permalink)
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malformed URL resolves to 'http://www.https.com//youtu.be/rN5nOCsLUUw'
edit:
I run 3½ in the front, it looks better lower (  ) but there exist speed bumps.
Why a tail-dragger instead of a rake?
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Last edited by freebeard; 04-17-2020 at 11:35 AM..
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04-17-2020, 04:41 AM
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#209 (permalink)
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04-17-2020, 01:03 PM
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#210 (permalink)
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rear lift
Quote:
Originally Posted by JulianEdgar
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I'm guessing that,the slanted backlight is a concession to styling.Had Porsche simply extended the roof profile rearwards,achieving a traditional Kamm/Fachsenfeld truncation,that all rear lift would be cancelled.With the unitary separation line,pressure recovery would have improved on the greenhouse,yielding a higher base pressure and reduced pressure drag,and overall drag reduction.Static loading on the rear axle would probably have been just fine,even flat out on the Autobahn.
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