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Forum: Aerodynamics 10-01-2016, 05:49 PM
Replies: 61
Views: 9,973
Posted By compdrag
Not taking away from what has been done before...

Not taking away from what has been done before but looking at the design of how the rear of this car is made lots of air is forced into the rear bumper I'll snap a few photos when I get home to show...
Forum: Aerodynamics 10-01-2016, 04:58 PM
Replies: 61
Views: 9,973
Posted By Frank Lee
One data point (half a data point?) does not rise...

One data point (half a data point?) does not rise above the noise of environmental variables. See: Coupe 69 mpg.

From what I think I've been taught, the holes will increase drag.
Forum: Aerodynamics 10-01-2016, 04:39 PM
Replies: 61
Views: 9,973
Posted By aerohead
holes/mpg

I'll find the SAE paper from Subaru and look at the delta-Cd for the bumper data and see if it's significant enough to even show at the gas pump.
I'm happy that your economy is up.I'm just not...
Forum: Aerodynamics 10-01-2016, 04:12 PM
Replies: 61
Views: 9,973
Posted By compdrag
Ok well my new tanks numbers are in. I did 378.6...

Ok well my new tanks numbers are in. I did 378.6 miles on this tank and used 11.86 gallons. It isn't no 100mpg, but on my way to at least 40mpg. So only having the holes in for half a tank obviously...
Forum: Aerodynamics 09-28-2016, 08:46 AM
Replies: 61
Views: 9,973
Posted By elhigh
I've seen this in a couple of other places, too. ...

I've seen this in a couple of other places, too. I generally think the better option is to pan over the space that becomes the parachute, but that still leaves you with the big vacuum wake to fill,...
Forum: Aerodynamics 09-27-2016, 10:10 PM
Replies: 61
Views: 9,973
Posted By compdrag
Exactly that is why i ordered the ultra gauge....

Exactly that is why i ordered the ultra gauge. Almost the same thing as the scan gauge. Just cheaper and I like that it has the obd trouble code detection too. It's like having three things at one....
Forum: Aerodynamics 09-27-2016, 09:47 PM
Replies: 61
Views: 9,973
Posted By Ecky
Consistent and reliable testing methodology is...

Consistent and reliable testing methodology is definitely going to require instrumentation. I found I wasn't able to make real lasting changes to my driving habits until I had real-time feedback.
Forum: Aerodynamics 09-27-2016, 09:41 PM
Replies: 61
Views: 9,973
Posted By compdrag
Yes the look is very aggressive, which I like....

Yes the look is very aggressive, which I like. Will look really mean When I lower it.

Just an update! I took my son to his therapy today, and like I said a little earlier I was just over half a...
Forum: Aerodynamics 09-27-2016, 09:11 PM
Replies: 61
Views: 9,973
Posted By freebeard
A-B-A For The Win

A-B-A For The Win
Forum: Aerodynamics 09-27-2016, 09:10 PM
Replies: 61
Views: 9,973
Posted By MPGeo
I like how it looks, and if it actually improves...

I like how it looks, and if it actually improves your overall performance then that's wonderful. If it also helps with improved FE, then even better.

I'd be interested to see what your results...
Forum: Aerodynamics 09-27-2016, 06:10 PM
Replies: 61
Views: 9,973
Posted By compdrag
Those are not my graphs. Someone else's, but with...

Those are not my graphs. Someone else's, but with a 3.5 second gain to 112 mph I was convinced. Right now I'm over 200 miles and still a little over half a tank. So I'm guessing I'm going to get good...
Forum: Aerodynamics 09-27-2016, 04:37 PM
Replies: 61
Views: 9,973
Posted By Ecky
I'd say two trails is less than ideal, but I'm...

I'd say two trails is less than ideal, but I'm highly interested in what you're doing here.
Forum: Aerodynamics 09-27-2016, 04:32 PM
Replies: 61
Views: 9,973
Posted By freebeard
Your test screenshots or that other guy's? It...

Your test screenshots or that other guy's? It dates to August of 2009.

If you look at newer supercars, the whole back end is ventilated. Maybe add a hexagonal mesh to the openings?
Forum: Aerodynamics 09-27-2016, 02:58 PM
Replies: 61
Views: 9,973
Posted By compdrag
The Holes!

Ok so I'm going to lay this out. I have been researching this for awhile, and really only found one individual that did some testing on the performance end of this. So I decided since my rear bumper...
Forum: Aerodynamics 07-25-2016, 04:37 PM
Replies: 266
Views: 75,279
Posted By aerohead
possible

*McLAREN claims an advantage with having the entire belly inclined (raked),with ground clearance increasing slightly as it proceeds aft.They offer no specifics.
*Otherwise,for a diffuser,starting...
Forum: Aerodynamics 07-25-2016, 12:37 PM
Replies: 266
Views: 75,279
Posted By freebeard
This, the third choice: ...

This, the third choice:

https://lh3.googleusercontent.com/--Z9TXVFXGUk/V5W_C69rKcI/AAAAAAAAAzY/K1lEl12ZZ6E6t560qR71yGpsGJ8JwE_LgCCo/s1152/Sin%2Bti%25CC%2581tulo%2B2.tiff

The difusser has...
Forum: Aerodynamics 06-30-2016, 09:15 AM
Replies: 266
Views: 75,279
Posted By Grant-53
The discussion on leaf spring suspension at...

The discussion on leaf spring suspension at recumbent.com was very intense and some very capable designers were involved. The danger was that the leaf would twist throwing off the geometry. The use...
Forum: Aerodynamics 06-30-2016, 12:00 AM
Replies: 266
Views: 75,279
Posted By freebeard
The latter. Like a Corvette leaf spring...

The latter. Like a Corvette leaf spring (https://en.wikipedia.org/wiki/Corvette_leaf_spring) held at the 1/3rd points, but A-arm shaped. I found an article where something like it is discussed on a...
Forum: Aerodynamics 06-29-2016, 12:36 PM
Replies: 266
Views: 75,279
Posted By freebeard
Nice work. It's sort of a T-arm instead of A-arm...

Nice work. It's sort of a T-arm instead of A-arm suspension? Why the heck not?

Edit: The software; could it lay out a dual traverse [airfoiled fiberglass] leaf suspension? With two pivot points...
Forum: Aerodynamics 01-23-2016, 08:57 PM
Replies: 8
Views: 1,572
Posted By oldtamiyaphile
Local media are reporting 25.8l/100km for the new...

Local media are reporting 25.8l/100km for the new RS. That's 9.1 MPG. Even considering that they were thrashing it (but included highway cruising), there's a limit to how fast you can go on a public...
Forum: Aerodynamics 01-23-2016, 03:01 PM
Replies: 8
Views: 1,572
Posted By aerohead
2016 Cd 0.355 Focus RS

OOPS! should read Cd 0.355,not 0.255 (I wish we could edit titles!)
Ford gave their computers less Thalidomide and excreted the new Cd 0.355 FOCUS RS,which is less deformed than the 2015 Cd 0.387...
Forum: Aerodynamics 01-23-2016, 02:24 PM
Replies: 0
Views: 791
Posted By aerohead
Vehicle Length-vs Cd

Without purchasing the paper we get an independent agreement with Hucho's 1985 assertion.
IEEE Xplore Abstract - Numerical analysis on effect of vehicle length on automotive aerodynamic drag...
Forum: Aerodynamics 01-11-2016, 04:17 PM
Replies: 21
Views: 4,359
Posted By gone-ot
BOATS & FISH "swim" through water (density:...

BOATS & FISH "swim" through water (density: 999.97 kg/m^3 ).

AIRPLANES & CARS "fly & drive" through air (density: 1.225 kg/m^3)
Forum: Aerodynamics 01-11-2016, 03:54 PM
Replies: 21
Views: 4,359
Posted By aerohead
it's all about aerodynamics

If you haven't seen this one it's pretty good, in that the stylists themselves,explain why we won't see really low drag cars....
Forum: Aerodynamics 01-09-2016, 01:20 PM
Replies: 266
Views: 75,279
Posted By freebeard
The blue and green edges are easily dealt with by...

The blue and green edges are easily dealt with by adding a block styrofoam bumper and rounding it appropriately.

The red edges are the ones I referred to. Since the top face has a incline for the...
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