Airtab® Fuel Savers 

Profound!

I'm so happy someone else remembers that show......I loved that show. There are some episodes downloaded on YT. I know I taped A few on VHS!!! like the car interior sound cancellation used a DSP thru the cars stereo......! That was the coolest show! There was also another similar tech-show around the same time........ I can't remember the name of it.

This explanation is completely wrong

How did they work?

Link?

That's some colorful fluid dynamics right there

@@windowsxseven looks more like a magnetic field than air flow

@@durim187 4:38 also looks sketchy af, there is no way that the flow will be that smooth between the first gap and especially not after the truck's trailing edge

@@windowsxseven lol and why the wake has curls?

@@durim187 air same as water, have viscosity: en.wikipedia.org/wiki/Viscosity

How does it work on your Ford?

Nop vortex generators reduce drag, without vortex generator especially the rear side will drag a big chunk of air with it

VG’s keep boundary layer attached thereby reducing drag

Spin

@@86czr7 🤣

Pretty sure the car would fly, maybe front edge of the wheel well?

It will cause a black hole. Do NOT do this.

Here is a source that shows the beneficial effects of these types of Vortex Generators. www.autospeed.com/cms/article.html?&A=113219 This reduces Wake Drag. Here is a video explaining vortex generators, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eP-YUDe9HF0.html. They are applied on plane wings and even on high speed race cars, because they have more benefits at higher speeds. The most likely reason they arent applied on normal cars is because they can look rather ugly and most people would take looks over benefits.

Richard, They come in panels, and at $100 per trailer/ truck, so not that much really. See more on www.v-spoilers.com

They do, fuel tankers run them

While I agree with you that the video should provide quantifiable data to support their claims, these do work. They help mix the faster moving air with the boundary layer air on the rear and side vehicle slopes which reduces the size of the low pressure air pocket behind the vehicle - reducing low pressure drag. I ordered some for my corolla after researching the concept. I will link a youtube video of a real world experiment demonstrating the effect of the vortex generators on airflow when positioned just above the rear windshield. I cant wait to do some real world MPG testing when I get mine. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-9pPTuFO9HCM.html

There is a large fleet in my hometown that runs these on all their trucks. I’m getting 8.5 miles per gallon on my company truck running regional. Figure a 2 to 5% gain three dollars a gallon diesel. I do 100,000 miles a year.

I'd say NACA duct is a bit similar

Its just a vortex generator

Marius Lazar Google Naca duct.

It's not just a vortex generator. It's a wishbone vortex generator, which is less tall than a normal strake or fin, so has less drag penalty per vortex created. NASA study citation: doi.org/10.2514/3.12282