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Search: Posts Made By: 4drviper
Forum: Aerodynamics 06-27-2020, 10:36 AM
Replies: 57
Views: 5,418
Posted By Vman455
Of course not. They're completely invisible to...

Of course not. They're completely invisible to anyone looking at the car unless they kneel and peer under it, yet most if not all manufacturers of passenger vehicles today use rear diffuser panels...
Forum: Aerodynamics 06-24-2020, 12:43 PM
Replies: 57
Views: 5,418
Posted By aerohead
tiny nubs

Those tiny nubs are the outcome of acoustic wind tunnel testing, and simply 'tune' the natural harmonic frequency ( wind noise ) of that surface, and it's octaves, beyond the reach of the human ear. ...
Forum: Aerodynamics 06-09-2020, 04:24 PM
Replies: 57
Views: 5,418
Posted By freebeard
If the goal is to raise pressure on the leeward...

If the goal is to raise pressure on the leeward side in a crosswind, Maybe you can achieve your goal with a roof-top strake....
Forum: Aerodynamics 06-09-2020, 03:40 AM
Replies: 57
Views: 5,418
Posted By JulianEdgar
The Stolspeed VGs arrived. I didn't realise that...

The Stolspeed VGs arrived. I didn't realise that they were coming from within Australia - no wonder postage was cheap!

https://i.postimg.cc/nrk4ZXsT/IMG-0499.jpg

They are indeed very small -...
Forum: Aerodynamics 06-02-2020, 07:38 PM
Replies: 57
Views: 5,418
Posted By JulianEdgar
No, I don't think so, but I've never really...

No, I don't think so, but I've never really thought about it in those terms. VGs just energise the boundary layer and so potentially give better flow attachment where separation is occurring.


...
Forum: Aerodynamics 06-02-2020, 06:48 PM
Replies: 57
Views: 5,418
Posted By gregersonke
When I increased cruising speed before, I would...

When I increased cruising speed before, I would get significantly worse average round trip gas mileage in the 40s, I would have to slow down to get 50s. now it's in the 50s consistently and I'm...
Forum: Aerodynamics 06-02-2020, 05:40 PM
Replies: 57
Views: 5,418
Posted By JulianEdgar
Ok, with this approach: Fit fin-type vortex...

Ok, with this approach:

Fit fin-type vortex generators on the hood in front of the windscreen to change A-pillar separation and so reduce susceptibility to crosswinds.

I don't think they will...
Forum: Aerodynamics 05-31-2020, 10:23 PM
Replies: 57
Views: 5,418
Posted By California98Civic
Lockheed Georgia airtab study

Because people will ask for it, I went and found the cited airtab study (I think this is the one):

[Anon,] "LOCKHEED GEORGIA LOWSPEED WIND TUNNEL HONDA CIVIC HATCHBACK AIRTAB(R) MODIFICATION...
Forum: EcoModding Central 11-24-2019, 07:53 PM
Replies: 7
Views: 1,351
Posted By rmay635703
Gen 1 Volt OEM Tires are among the lowest rolling...

Gen 1 Volt OEM Tires are among the lowest rolling resistance 17” tires on the market. AKA Goodyear 215/55r17

To get good wear you will need to bump up pressure
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