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Old 05-26-2021, 01:07 PM   #1 (permalink)
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video re-broadcast Lightyear One

I went back into past posts looking to see if we'd shown this. I gave up @ 9-pages.
Anyway, if you haven't seen this, it's worth a look.
You'll notice in the smoke flow imaging that, air is fully-attached at the aft-body top, rear separation line which validated their CFD results ( the reason for their trip to the tunnel ).
Then, the numerical CFD color image is presented, showing identical flow, plus illustrating the wake structure.
Annemiek Koers makes the comment that, had the rear slope of the roofline been steeper, they'd have lost flow attachment, creating a lot of drag.
The pressure recovery pushes the car forward.
Flow is separated from the diffuser. Which may have been intentional. Don't know, and while they speak of lift testing and stability, they do not go into it.
They speak of 'targets' and my take-away is, that they met, or exceeded them.
https://thedriven.io/2019/10/30/ligh...rodynamic-car/

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Old 05-26-2021, 01:25 PM   #2 (permalink)
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Them taping the cut lines reminds me of the good times in Ogden, UT.
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Old 05-26-2021, 01:40 PM   #3 (permalink)
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cut lines.

Right! Engineering Magazine had mentioned the counts generated by these cut lines, in their article about drag measured by General Motors staff during the development of their PGNV compliance car, 'Precept,' for 1999.
While taping 'SPIRIT' didn't produce any measurable drag change, it's certainly something I wanted to validate, one way, or the other.
That was a productive trip. Wish we could have got the Dasher in there.
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Old 05-26-2021, 04:21 PM   #4 (permalink)
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The Dasher is still here, in body if not [spirit in the DMV's eyes]. But Darko is gone.

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