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Search took 0.14 seconds. Search: Posts Made By: chillsworld
Forum: Aerodynamics 03-27-2015, 03:02 PM
Replies: 2
Views: 1,205
Posted By aerohead
Would

*This is the best question!
*It's only been recently that carmakers have had to consider these small points,driven by the upcoming CAFE standards of 2025.
*And we have no current scientific (a...
Forum: Aerodynamics 03-26-2015, 05:11 PM
Replies: 2
Views: 1,205
Posted By aerohead
Reynolds number

Reynolds number determines whether a structure will have a laminar or turbulent boundary layer.
At 20-mph and above,because of their length,automobiles will transition to turbulent boundary layer...
Forum: Aerodynamics 03-23-2015, 04:36 PM
Replies: 63
Views: 15,752
Posted By aerohead
general thought on dimples

*The surface friction coefficient is 0.003 (Hoerner)
*The surface area of an automobile is estimated @ 10-X frontal area (Hoerner)
*The surface friction drag of an automobile is 0.03 (Hoerner)....
Forum: Aerodynamics 03-23-2015, 12:39 PM
Replies: 63
Views: 15,752
Posted By freebeard
While what you are saying it true, it is...

While what you are saying it true, it is mitigated by the fact that the energy imparted to, and recovered from, the air is less per unit volume at a distance than at the vehicle's surface. The...
Forum: Aerodynamics 03-20-2015, 09:18 PM
Replies: 63
Views: 15,752
Posted By oldtamiyaphile
You've clearly come on here with a better...

You've clearly come on here with a better understanding of the effects dimples than the average poster on the subject. While the general consensus might be against them that doesn't mean they can't...
Forum: Aerodynamics 03-19-2015, 06:49 PM
Replies: 63
Views: 15,752
Posted By aerohead
dimples

*The issue would be a 'one-size-fits-all' booby-trap.
*I can see how the material could function as a turbulator,but each particular vehicle would have to be analyzed for boundary layer thickness at...
Forum: Aerodynamics 03-19-2015, 05:53 PM
Replies: 63
Views: 15,752
Posted By California98Civic
Neither of these image prove the idea works, but...

Neither of these image prove the idea works, but it does suggest that people with significant budgets are experimenting (maybe often merely marketing experiments):
...
Forum: EcoModding Central 11-24-2014, 01:14 PM
Replies: 13
Views: 9,432
Posted By kafer65
John also has the 13:1 compression pistons (AND...

John also has the 13:1 compression pistons (AND COMBO) which allow them to be able to go so lean that they run cooler. I was a hairs breadth away from ordering a set this time for my engine build. ...
Forum: EcoModding Central 10-03-2014, 06:41 AM
Replies: 18
Views: 5,096
Posted By adam728
Tall skinny fan here as well. I've used 33 x...

Tall skinny fan here as well. I've used

33 x 9.50 BFG MT's (before they dropped that size, 85 Toyota)
34x10.50 Swamper LTB's (89 Toyota)
33x10.50 BFG AT's (01 Jeep TJ)
235/85/16 Toyo Open...
Forum: EcoModding Central 10-02-2014, 08:30 AM
Replies: 18
Views: 5,096
Posted By CapriRacer
You are correct that tire technology had not...

You are correct that tire technology had not reached the point where low aspect ratios were common - or even possible.

For practical purposes, plain jane bias tires can not be produced with an...
Forum: Success Stories 09-17-2014, 12:02 PM
Replies: 42
Views: 8,673
Posted By TheGrimMechanic
No need to be confused. Deleting the EGR and AIS...

No need to be confused. Deleting the EGR and AIS will improve your fuel mileage. On modern vehicles, the use of EGR is because manufacturers did a cost benefit analysis and would rather use a $25...
Forum: Aerodynamics 09-03-2014, 02:10 PM
Replies: 15
Views: 10,770
Posted By sqidd
Belly Pan/Splitter/Diffuser Project

Thought you guys would dig this. In this case I did not do these mods for mileage, I did it for top speed/safety. But the same principals apply obviously.

This was done on my 2007 Mustang

Front...
Forum: Aerodynamics 08-30-2014, 03:39 PM
Replies: 6
Views: 2,368
Posted By cptsideways
I did an interesting intercooler mod with my old...

I did an interesting intercooler mod with my old Toyota Soarer drift car, ducted via grill & venting via the front of the bonnet (known as a V-mount system) Using the negative air pressure over the...
Forum: Aerodynamics 08-27-2014, 10:37 AM
Replies: 28
Views: 6,408
Posted By Carbon
Cinder blocks are essentially pressed sand with...

Cinder blocks are essentially pressed sand with some concrete mixed in to make them hold a shape... they can be very strong in compression, but they are not stable for side loads and shearing. ...
Forum: Aerodynamics 08-18-2014, 06:15 PM
Replies: 70
Views: 52,675
Posted By aerohead
speeds

Above 20-mph,the coefficients of drag for all the components of the car would be fixed,up to around 250-mph,when compressibility effects started to show up,so all their individual behaviors would be...
Forum: Aerodynamics 08-16-2014, 01:37 PM
Replies: 38
Views: 7,608
Posted By aerohead
Receiver-hitch boat tail

Here is a rendering from back in 2004.
The Stowaway II offered the elongation which would allow boat-tailing,and there would be the utility of additional cargo space without resorting to a roof rack...
Forum: Aerodynamics 08-13-2014, 08:05 PM
Replies: 70
Views: 52,675
Posted By ijames
In case you haven't thought of this detail yet,...

In case you haven't thought of this detail yet, one other thing to keep in mind with a duct outlet that points up is that rain will run down into the duct (especially when parked) so be sure to...
Forum: Aerodynamics 08-13-2014, 06:01 AM
Replies: 70
Views: 52,675
Posted By Gasoline Fumes
http://www.killrobot.com/images/rad_air.gif

http://www.killrobot.com/images/rad_air.gif
Forum: Aerodynamics 08-12-2014, 05:44 PM
Replies: 70
Views: 52,675
Posted By aerohead
pedestrian safery regulations

Automakers are being held to pedestrian safety legislation which is created to protect in a frontal collision.
The pedestrians body cannot deform the hood in an impact such that they strike a...
Forum: Aerodynamics 08-11-2014, 06:53 AM
Replies: 70
Views: 52,675
Posted By serialk11r
I'm not entirely convinced that many of those...

I'm not entirely convinced that many of those race car examples even have a well-designed vent. I'm not an expert but here goes:

Let's look at the McLaren P1, a car that you can probably trust has...
Forum: Aerodynamics 08-09-2014, 08:39 PM
Replies: 70
Views: 52,675
Posted By freebeard
My mention of pic#1 was distracting; I meant what...

My mention of pic#1 was distracting; I meant what range of vehicles are you considering. I assume front-engined and water cooled.
...
Forum: Aerodynamics 08-09-2014, 01:57 PM
Replies: 10
Views: 6,001
Posted By aerohead
'Roof' numbers from Hucho/Buchheim

I went back through Hucho's text in the section for roof camber:
*Only a notchback car is analyzed
*Roof convexity drag reduction peaks when the height of the 'bump' is 17.5% of total vehicle...
Forum: Aerodynamics 08-09-2014, 01:11 PM
Replies: 70
Views: 52,675
Posted By freebeard
I would paraphrase your question as 'do best...

I would paraphrase your question as 'do best practices in the race car field apply to ecomodding?' Close enough?

Your question could use some more context (like you pic #1). Ecomodding extends...
Forum: Aerodynamics 08-09-2014, 11:33 AM
Replies: 70
Views: 52,675
Posted By Cobb
Interesting.... I assumed you were going to...

Interesting.... I assumed you were going to mention the reverse cowl hood like you see on many v8 powered vehicles or the hood vent like you see on a hummer. I think in the hummer the radiator maybe...
Forum: Aerodynamics 08-08-2014, 10:35 PM
Replies: 10
Views: 6,001
Posted By freebeard
Embrace the box—and then think outside it. These...

Embrace the box—and then think outside it. These exist, or you could make your own.

http://pangaea-expeditions.com/wp-content/gallery/overlandexpo11/ovexpo21.jpg

As chillsworld, says, boattail...
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