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Forum: Aerodynamics 07-07-2014, 02:14 PM
Replies: 50
Views: 10,475
Posted By Patrick
Here's a drawing of the "optimum nose": Fuel...

Here's a drawing of the "optimum nose":

Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - aerohead's Album: Book illustrations - Picture...
Forum: The Lounge 07-06-2014, 08:29 PM
Replies: 35
Views: 4,987
Posted By Patrick
She's baiting you. She wants to see if you'll...

She's baiting you. She wants to see if you'll agree. Never, ever agree!
Forum: Aerodynamics 07-05-2014, 08:27 PM
Replies: 53
Views: 11,574
Posted By ERTW
So you're the wonderful guy who does 90 kph on...

So you're the wonderful guy who does 90 kph on the highway. It all makes sense now. Thank you for a thoughtful and insightful discussion.
Forum: DIY / How-to 07-04-2014, 09:39 PM
Replies: 772
Views: 256,063
Posted By NeilBlanchard
I am debating about using my CNC machine to cut...

I am debating about using my CNC machine to cut the seats that I had modeled, or to just do it from scratch. I had modeled much of the interior of the car, but certainly not all of it. The inside...
Forum: The Unicorn Corral 07-04-2014, 12:36 PM
Replies: 87
Views: 13,852
Posted By pgfpro
Every time I see one of these threads I think of...

Every time I see one of these threads I think of this.

Mail order gadget/time machine

http://i147.photobucket.com/albums/r312/rrussell_photo/wallpaper_timemachine1252982389_zps771d6db2.jpg...
Forum: Aerodynamics 07-04-2014, 12:39 AM
Replies: 53
Views: 11,574
Posted By Patrick
It's a logarithmic (Log) scale. Each major...

It's a logarithmic (Log) scale. Each major division increases by a power of 10. Where the 1 is would be Re = 1; where the 10 is would be Re = 10; the next one is 10 squared (see the 2 to the right...
Forum: Aerodynamics 07-04-2014, 12:16 AM
Replies: 53
Views: 11,574
Posted By Patrick
No, he said it would simulate a real car going...

No, he said it would simulate a real car going about 2 mph.

Ideally, you want the Reynolds number of the model to be the same as the vehicle you are simulating. But since the car is 1/32 size, you...
Forum: Aerodynamics 07-04-2014, 12:10 AM
Replies: 53
Views: 11,574
Posted By freebeard
The rabbit hole goes a long way down. Can anyone...

The rabbit hole goes a long way down. Can anyone explain the scaling on the Re axis to me?
http://www.aerospaceweb.org/question/aerodynamics/drag/drag-disk.jpg




The link you posted says no.
Forum: Aerodynamics 07-03-2014, 04:59 PM
Replies: 53
Views: 11,574
Posted By freebeard
Possibly so, but then I'd never get re-finishing...

Possibly so, but then I'd never get re-finishing my new kitchen cabinet done. I have made progress with 3D modeliing. Something I couldn't do before works now. ??? I can remove the bumpers and...
Forum: Aerodynamics 07-03-2014, 02:21 PM
Replies: 9
Views: 1,308
Posted By gone-ot
Well, they claim the first thing to go is the...

Well, they claim the first thing to go is the mind, but I can't recall what was second...or third...or fourth...
Forum: Aerodynamics 07-03-2014, 08:41 AM
Replies: 101
Views: 25,195
Posted By kach22i
What cannot be done is to follow the template in...

What cannot be done is to follow the template in plan view (unless you have a 3-wheeled car) in true full 3D. This is why the following quote is so important.



You may not be able to out think...
Forum: Aerodynamics 07-02-2014, 06:04 PM
Replies: 101
Views: 25,195
Posted By aerohead
slope

*Each aft-body,of a particular percentage of total body length will have an optimum slope.This slope will change if plan taper or diffusers are added.
*If the aft-body has 'curvature,' rather than a...
Forum: DIY / How-to 07-02-2014, 12:43 PM
Replies: 772
Views: 256,063
Posted By NeilBlanchard
I have in the past, gone back to correct or...

I have in the past, gone back to correct or improve my CNC layouts (specifically to put spreaders in the hatch door opening to maintain the correct locations, as well as several other smaller...
Forum: Aerodynamics 07-01-2014, 05:59 PM
Replies: 60
Views: 34,061
Posted By aerohead
Cd values from bar graph

I did a photo-enlargement of the graph,measured each 'bar',then did linear interpolation to develop Cds for each 'bar.' With Cds attached to each mod,it's easier to evaluate their individual...
Forum: Aerodynamics 07-01-2014, 03:08 AM
Replies: 51
Views: 16,053
Posted By freebeard
I threw together 4 (previously unseen?) views. ...

I threw together 4 (previously unseen?) views.

http://ecomodder.com/forum/member-freebeard-albums-photoshops-picture6253-four-tails.jpg

The idea with the bottom section (which looks a little...
Forum: Hypermiling / EcoDriver's Ed 07-01-2014, 12:21 AM
Replies: 24
Views: 6,876
Posted By oldtamiyaphile
I would argue that 1800rpm isn't 'slow'...

I would argue that 1800rpm isn't 'slow' acceleration, that's actually probably around BSFC. The argument for accelerating 'fast' isn't to rev to 5000+ RPM, its' actually to use high loads to...
Forum: Aerodynamics 06-30-2014, 01:47 PM
Replies: 53
Views: 11,574
Posted By aerohead
sides

Here is a plan-view of the 'template.'
http://i1271.photobucket.com/albums/jj622/aerohead2/Bottom.jpg (http://s1271.photobucket.com/user/aerohead2/media/Bottom.jpg.html)
It's based upon a...
Forum: Aerodynamics 06-30-2014, 01:27 PM
Replies: 51
Views: 16,053
Posted By aerohead
2nd from bottom

It's the Mercedes-Benz 'Boxfish' concept car of 2009,Cd 0.19.
Here is also the 1987 Renault Vesta II,Cd 0.186,same Cd as Schl'o'rwagen,and one of the recent VW XL1's....
Forum: Aerodynamics 06-30-2014, 01:21 PM
Replies: 51
Views: 16,053
Posted By aerohead
fenders

Here,you can see how Carl Breer attempted to blend the 1934 DeSoto Airflow test mules fenders into the body a little better.
For all the mods,they went from Cd 0.51,to 0.244,about what Elon Musk...
Forum: Aerodynamics 06-29-2014, 06:51 AM
Replies: 53
Views: 11,574
Posted By NeilBlanchard
The last image in Phil's post deals with side...

The last image in Phil's post deals with side taper - and yes I think the sides are similar to the top. But since they are adjacent to the bottom - and the ground, they are a bit different than the...
Forum: Aerodynamics 06-29-2014, 06:01 AM
Replies: 60
Views: 34,061
Posted By ausias
This link is working: Information: How To...

This link is working:
Information: How To Reduce Drag From 0.28 to 0.20 (Scholastic more than anything)...
Forum: Aerodynamics 06-28-2014, 03:26 PM
Replies: 51
Views: 16,053
Posted By aerohead
modern Kammback

I think this is VW's 'UP' concept.
http://i1271.photobucket.com/albums/jj622/aerohead2/06-2811.jpg (http://s1271.photobucket.com/user/aerohead2/media/06-2811.jpg.html)
Of course there's the VW XL1...
Forum: Aerodynamics 06-28-2014, 02:30 PM
Replies: 53
Views: 11,574
Posted By aerohead
Aerodynamic Streamlining Mini-Course

*With sharp leading edges separation is immediate,leading to high drag.
http://i1271.photobucket.com/albums/jj622/aerohead2/Untitled-5-2.jpg...
Forum: Aerodynamics 06-28-2014, 12:59 PM
Replies: 24
Views: 7,475
Posted By freebeard
The reason to do an electric conversion would be...

The reason to do an electric conversion would be to try something like this:

http://i.imgur.com/6KNJi.png

About the picture: I came up empty-handed in Tin Eye, and Google Reverse Image Search...
Forum: Aerodynamics 06-27-2014, 12:01 PM
Replies: 51
Views: 16,053
Posted By freebeard
http://ecomodder.com/forum/member-freebeard-albums...

http://ecomodder.com/forum/member-freebeard-albums-concepts-picture4998-edag-biwak-concept-2006-800x600-wallpaper-03.jpg...
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