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Old 12-05-2022, 11:10 AM   #581 (permalink)
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At the mountain today. No eco mods. Snow is dry and light and not as sticky so better to see how airflow stays attached on most of the car. You can see early separation at the bottom back bumper behind the rear wheels.

Back of car still has suction cup affect and capture Tons of snow. Lower hatch glass is covered and back up camera. Wish I could fix this

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Old 12-12-2022, 11:38 AM   #582 (permalink)
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Another snow pattern rear
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Old 12-12-2022, 11:41 AM   #583 (permalink)
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'pattern'

It appears to follow the separation line with high fidelity!
Last night, I saw a JEEP ad for the first time, video-graphed in the snow. You could clearly see snowflakes entrained within the enormous wake.
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Old 12-12-2022, 03:26 PM   #584 (permalink)
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Quote:
Originally Posted by aerohead View Post
It appears to follow the separation line with high fidelity!
Last night, I saw a JEEP ad for the first time, video-graphed in the snow. You could clearly see snowflakes entrained within the enormous wake.
I need to figure out what to do with the separation at the lower part of the bumper. Isnít as clean. I wish there was a way to prevent all the snow build up on the back
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Old 12-12-2022, 03:42 PM   #585 (permalink)
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lower bumper

With the skirts, belly pan, and diffuser, the wake ( base ) pressure will be as high as it's going to get, until the box-cavity usefully elongates the car.
Time and resources invested in the bumper would be lost, covered over by the cavity.
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Old 12-12-2022, 07:03 PM   #586 (permalink)
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Snow melted. Hereís how the dirt deposited. Wonder what this says about pressure too in the rear.
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Old 12-12-2022, 08:50 PM   #587 (permalink)
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It looks like the chamfers under the tail lights pinch off the wake.
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Old 12-15-2022, 10:10 AM   #588 (permalink)
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pressure

Quote:
Originally Posted by Phase View Post
Snow melted. Hereís how the dirt deposited. Wonder what this says about pressure too in the rear.
Closely-spaced streamlines mean high-velocity, low pressure.
Widely-spaced streamlines mean low-velocity, high pressure.
The base pressure is determined by the pressure at the separation line.
The only way to 'raise' the pressure is by elongating the body along a streamlined path, which produces the pressure recovery as the streamlines decelerate, trading velocity for static pressure.
( if you've seen the 'blue' wind tunnel smoke-flow image of the VW XL1, you'll see how the streamlines are 'wide' at the very back of the car. This is why it's Cd 0.189 ).
Same for M-B IAA.
M-B EQXX.
It's also why the car doesn't have rear lift and doesn't have a rear spoiler, and is stable at 112-mph.
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Old 12-15-2022, 11:36 AM   #589 (permalink)
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Quote:
Originally Posted by aerohead View Post
Closely-spaced streamlines mean high-velocity, low pressure.
Widely-spaced streamlines mean low-velocity, high pressure.
The base pressure is determined by the pressure at the separation line.
The only way to 'raise' the pressure is by elongating the body along a streamlined path, which produces the pressure recovery as the streamlines decelerate, trading velocity for static pressure.
( if you've seen the 'blue' wind tunnel smoke-flow image of the VW XL1, you'll see how the streamlines are 'wide' at the very back of the car. This is why it's Cd 0.189 ).
Same for M-B IAA.
M-B EQXX.
It's also why the car doesn't have rear lift and doesn't have a rear spoiler, and is stable at 112-mph.
I definitely need to extend my rear and make a mini boat tail. No idea how Iíll deal with the tail lights though
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Old 12-15-2022, 12:02 PM   #590 (permalink)
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'lighting'

There's always trailer lighting kits from HARBOR FREIGHT TOOLS.
And perhaps a dedicated backup camera, leaving all the OEM electricals in place.

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