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Forum: Aerodynamics 04-20-2024, 01:55 PM
Replies: 23
Views: 773
Posted By Vman455
The kinematic viscosity of water is an order of...

The kinematic viscosity of water is an order of magnitude smaller than that of air--so using water instead of air, you can use an object an order of magnitude smaller in length, or test at a speed an...
Forum: Events & Meet-ups 04-15-2024, 04:30 PM
Replies: 17
Views: 2,008
Posted By Vman455
Nice write-up, and nice mileage--that's in the...

Nice write-up, and nice mileage--that's in the 911? Fantastic numbers if so.

That's always the issue--dealing with other traffic. It seems like half the people every year have no idea what they're...
Forum: Events & Meet-ups 01-25-2024, 03:09 PM
Replies: 17
Views: 2,008
Posted By Vman455
You can do the Boot with no brakes but you...

You can do the Boot with no brakes but you probably won't be able to neutral coast without going over the speed limit. I tried to come into it at 55, lift off and let it coast with default regen...
Forum: Events & Meet-ups 01-24-2024, 11:25 PM
Replies: 17
Views: 2,008
Posted By Vman455
We used the long course for the first time in...

We used the long course for the first time in 2022. Speed was still 45 mph that year; last year they waited until just before the rally to announce target speed (46 mph). That was fun having a little...
Forum: Aerodynamics 10-04-2023, 03:16 PM
Replies: 18
Views: 1,174
Posted By Vman455
Julian’s video is a great example of testing: on...

Julian’s video is a great example of testing: on a real car, in the real world, with attainable equipment (the pressure scanner is on the expensive side, but you can make measurements like this with...
Forum: Aerodynamics 09-16-2023, 10:47 AM
Replies: 6
Views: 511
Posted By Vman455
*sigh* Okay. What aerohead is arguing is...

*sigh*

Okay. What aerohead is arguing is that if we have a curve, a surface that is not the same shape as the curve but intersects it at 2 points will have similar or the same flow over it (hence...
Forum: Aerodynamics 08-10-2023, 11:00 AM
Replies: 45
Views: 2,939
Posted By Vman455
Tufts don't show pressure. Even separated vs....

Tufts don't show pressure. Even separated vs. attached tufts don't necessarily tell you anything about the pressure.

Deliberately separating the flow behind a roof spoiler on my car dropped the...
Forum: Aerodynamics 07-09-2023, 09:00 PM
Replies: 19
Views: 1,683
Posted By Vman455
Why do you presume I'm entering as a...

Why do you presume I'm entering as a first-year?;)

UIUC has several student motorsports teams for which aerodynamics is a primary focus, including a solar car, Supermileage car, Shell Ecomarathon...
Forum: Aerodynamics 07-08-2023, 11:21 AM
Replies: 37
Views: 2,867
Posted By Vman455
***As long as everyone keeps it respectful/no ad...

***As long as everyone keeps it respectful/no ad hominems or personal attacks, this discussion can continue. Use the "report post" button (which notifies all moderators, not just me) if you feel...
Forum: Aerodynamics 07-05-2023, 01:43 PM
Replies: 37
Views: 2,867
Posted By Vman455
I don't believe you are comprehending what I...

I don't believe you are comprehending what I wrote in this several-years-old post since you aren't addressing any of the arguments I or Barnard made or evidence I brought up. Try this: read through...
Forum: Aerodynamics 05-04-2023, 05:00 PM
Replies: 7
Views: 659
Posted By Vman455
Siting Cold Air Intakes pt. 1...

Siting Cold Air Intakes pt. 1 (https://www.autospeed.com/cms/a_113157/article.html)
Siting Cold Air Intakes pt. 2 (https://www.autospeed.com/cms/a_2081/article.html)
Eliminating Negative Boost...
Forum: Aerodynamics 04-24-2023, 04:15 PM
Replies: 82
Views: 6,094
Posted By Vman455
The obvious (and valid) criticism of...

The obvious (and valid) criticism of throttle-stop testing hasn't even been brought up in this thread, despite all the ink spilled. It is: can we be sure that a constant throttle opening really...
Forum: Aerodynamics 04-22-2023, 11:25 AM
Replies: 82
Views: 6,094
Posted By Vman455
It was explained several times: BSFC has nothing...

It was explained several times: BSFC has nothing to do with throttle-stop testing since throttle-stop testing does not use fuel consumption as a measurement parameter.

Throttle-stop testing works...
Forum: Aerodynamics 11-17-2022, 05:25 PM
Replies: 19
Views: 1,683
Posted By Vman455
Apologies for not replying here sooner. I haven't...

Apologies for not replying here sooner. I haven't had much interest the last few months in commenting on this forum, but I've been checking in from time to time to see what's going on. And it's...
Forum: Aerodynamics 06-03-2022, 09:41 AM
Replies: 47
Views: 4,370
Posted By Vman455
Yes, this is correct--but you are missing my...

Yes, this is correct--but you are missing my point, which is that this "sweet spot" does not necessarily correlate with the height of underbody components, and thus that height should not be used as...
Forum: Aerodynamics 06-01-2022, 07:52 PM
Replies: 47
Views: 4,370
Posted By Vman455
There's been some published on air dam research,...

There's been some published on air dam research, yes. The most recent article I have was published by Ford engineers in 2018, testing air dam depth and curvature on the 2015 F-150.

Nowhere in the...
Forum: Aerodynamics 05-30-2022, 08:48 AM
Replies: 8
Views: 1,057
Posted By Vman455
Optimizing Aerodynamics of a Truck: Part 1...

Optimizing Aerodynamics of a Truck: Part 1 (https://www.amateuraerodynamics.com/2022/04/optimizing-aerodynamics-of-truck-part-1.html)

Optimizing Aerodynamics of a Truck: Part 2...
Forum: Aerodynamics 04-17-2022, 08:04 AM
Replies: 58
Views: 4,879
Posted By Vman455
Do you actually want to know if your...

Do you actually want to know if your modifications work, or not? Because every time I've suggested testing something on this and your other thread you've come back with excuses why you can't. You're...
Forum: Aerodynamics 04-16-2022, 06:10 PM
Replies: 58
Views: 4,879
Posted By Vman455
That's fine--but if you want to know if the...

That's fine--but if you want to know if the smaller blindspot mirror (with or without fairing) has lower drag than the stock mirror, you will need to test it. There's an unfortunate belief on this...
Forum: Aerodynamics 04-16-2022, 09:39 AM
Replies: 58
Views: 4,879
Posted By Vman455
I siliconed plastic covers on the truck: ...

I siliconed plastic covers on the truck:
...
Forum: Aerodynamics 04-14-2022, 08:45 AM
Replies: 8
Views: 2,418
Posted By Vman455
Hmm...I'm not sure what you mean by "bumper...

Hmm...I'm not sure what you mean by "bumper hole"?



I didn't bother testing drag with mirrors folded after tufting the window and seeing that the flow didn't really change with the mirrors...
Forum: Aerodynamics 04-12-2022, 03:01 PM
Replies: 8
Views: 2,418
Posted By Vman455
We don't know without testing, and unfortunately...

We don't know without testing, and unfortunately the difference between the two will likely be much smaller than what I can measure on the road.

I did, however, redo the grill blocks--but not...
Forum: Events & Meet-ups 04-12-2022, 02:39 PM
Replies: 20
Views: 4,016
Posted By Vman455
Speaking of next year, I'm seriously considering...

Speaking of next year, I'm seriously considering bringing my 1991 Toyota pickup that I've started aeromodding/testing...
Forum: Events & Meet-ups 04-12-2022, 02:36 PM
Replies: 20
Views: 4,016
Posted By Vman455
I'll have to try that RallyTracks; thanks! I...

I'll have to try that RallyTracks; thanks!

I didn't have the course length with Boot offhand, so I wasn't able to calculate anything. 2019--the last time I was there--I did calculate lap time...
Forum: Events & Meet-ups 04-12-2022, 09:14 AM
Replies: 20
Views: 4,016
Posted By Vman455
Bob announced at the driver's meeting that we...

Bob announced at the driver's meeting that we were shooting for 43 mph. I was watching my average speed readout, but that of course included the idle time and pace lap so it ended up reading ~41 mph.
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