Go Back   EcoModder Forum > EcoModding > Aerodynamics
Register Now
 Register Now
 


Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-17-2013, 10:57 AM   #761 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,726
Thanks: 36
Thanked 2,464 Times in 1,720 Posts
I agree with you guys about the dimpling location, looks to be an artistic expression more than an engineering solution.

Re-post from another thread regarding attachment.

NASA - Learning to Fly on Mars

Quote:
Image above: In wind-tunnel testing, the inflated wing's "bumpy" profile improves aerodynamic performance by reducing flow separation in low-density, high-speed flight conditions expected for Mars flight. Credit: University of Kentucky
And an example of location specific dimples.

http://forums.pelicanparts.com/off-t...ml#post7660402
Quote:
Originally Posted by widebody911 View Post
The Corbin Sparrow had golf ball dimples in the late 80's
This has got to be a low CdA yet high-ish Cd example below.

http://forums.pelicanparts.com/off-t...ures-1176.html

__________________
George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html

Last edited by kach22i; 09-17-2013 at 11:15 AM..
  Reply With Quote
The Following User Says Thank You to kach22i For This Useful Post:
aerohead (09-30-2013)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-18-2013, 03:46 PM   #762 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,726
Thanks: 36
Thanked 2,464 Times in 1,720 Posts
Just an artist rendering, but a good one.

↑ The Playboy Land Yacht Concept by Syd Mead (1975)
The Playboy Land Yacht Concept by Syd Mead (1975) - Blog

Quote:
... you'll see that the yacht's pointed nose serves two functions: It provides the aerodynamic styling that a machine of this size demands and it allows for the four lounge seats up front to be arranged at a 45-degree angle to the axis of the vehicle, thus saving considering interior space.
__________________
George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
  Reply With Quote
The Following User Says Thank You to kach22i For This Useful Post:
aerohead (09-30-2013)
Old 09-18-2013, 05:17 PM   #763 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,667

GasDwarf - '13 Volkswagen up! EcoFuel CNG
Thanks: 176
Thanked 643 Times in 510 Posts
Nothing aerodynamic about that land yacht ... other than it being an aerodynamic disaster.
  Reply With Quote
The Following 2 Users Say Thank You to euromodder For This Useful Post:
Cd (09-18-2013), NeilBlanchard (09-19-2013)
Old 09-18-2013, 06:03 PM   #764 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,213
Thanks: 2,466
Thanked 852 Times in 505 Posts
Actually not bad considering some of Syds other stuff from Blade Runner :



  Reply With Quote
The Following User Says Thank You to Cd For This Useful Post:
aerohead (11-09-2013)
Old 09-19-2013, 04:02 AM   #765 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 18,363
Thanks: 5,037
Thanked 6,073 Times in 4,862 Posts
Syd Mead's pre-Segway


He also did the Tron motorcycle.
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (09-30-2013)
Old 09-19-2013, 01:14 PM   #766 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,726
Thanks: 36
Thanked 2,464 Times in 1,720 Posts
Quote:
Originally Posted by euromodder View Post
Nothing aerodynamic about that land yacht ... other than it being an aerodynamic disaster.
The body tapers in at the back, the middle part being widest.

Beats the snot out of a straight slab sided RV still being produced today.

I'm not wild about the roof attachment.

I'll admit this Syd Mead thing falls way short of the Vixen though.
__________________
George
Architect, Artist and Designer of Objects

1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft

Chin Spoiler:
http://forums.pelicanparts.com/off-t...effective.html

Rear Spoiler Pick Up Truck
http://forums.pelicanparts.com/off-t...xperiment.html

Roof Wing
http://ecomodder.com/forum/showthrea...1-a-19525.html
  Reply With Quote
Old 09-19-2013, 02:09 PM   #767 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 18,363
Thanks: 5,037
Thanked 6,073 Times in 4,862 Posts
Quote:
Quote: Originally Posted by euromodder
Nothing aerodynamic about that land yacht ... other than it being an aerodynamic disaster.

The body tapers in at the back, the middle part being widest.

Beats the snot out of a straight slab sided RV still being produced today.
I can't find anything right now but those pictures reposted repeatedly, but the vehicle is something like 12 feet wide. Comparison to the Vixen is beside the point.

Self-driving in 1975, though.

I'd prefer Colani's effort
  Reply With Quote
The Following User Says Thank You to freebeard For This Useful Post:
aerohead (11-09-2013)
Old 09-20-2013, 02:33 AM   #768 (permalink)
Master EcoModder
 
Join Date: Feb 2009
Location: Phoenix
Posts: 595
Thanks: 106
Thanked 113 Times in 71 Posts


Unsure if powered or pedaled...
__________________
2005 Escape 2.3 MT 2WD
2002 Mustang 3.8 AT
2015 Ram 1500 5.7L 4WD
2002 Motobecane 700DS
  Reply With Quote
The Following User Says Thank You to shovel For This Useful Post:
aerohead (09-30-2013)
Old 09-21-2013, 11:09 PM   #769 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,877

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,394
Thanked 2,887 Times in 1,814 Posts
^^^
That is a Quest and it is pedal powered.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
aerohead (09-30-2013)
Old 09-21-2013, 11:56 PM   #770 (permalink)
EcoModding Lurker
 
fidalgoman's Avatar
 
Join Date: Jul 2009
Location: NW Montana
Posts: 89
Thanks: 6
Thanked 21 Times in 19 Posts
Quote:
Originally Posted by euromodder View Post
Looking at the angles of the roof, it doesn't need any dimpling for aero purposes.
Where the design might use them - like aft of the rear wheel arcs, where the bodywork falls of sharply - there are no dimples.

You don't want round shapes on the rear.
The thing that drives me a bit crazy is this whole dimpling thing. Golf balls have dimples because they are so small compared to the viscosity of the air. Very small dimples the size of the ones in golf balls might work on a small scale but not with golf ball size divots on automobiles, etc. Vortex generators work by creating low pressure areas and suck down the thick boundary layer to follow the profile. The more you work the air the more drag is produced. Sometimes it's on the positive side when detached flow is resolved.

Rounded in front with smooth pressure recovery profile in the rear. Most things are compromises for shape and space with true streamlining rare. Don't look at Racecars since they are more about down-force than pure drag reduction.

Reynolds numbers are the reason that aerodynamics is so different on the micro vs. the macro scale. Also there is a great deal of difference on what works aerodynamically at 0-100, 100-250 and 250 MPH up to near Mach speeds. There is a huge body of information out there.

  Reply With Quote
The Following User Says Thank You to fidalgoman For This Useful Post:
cfd_guy (09-23-2013)
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Electric Cars Push Japan Engine Parts Makers to Crisis Mode tjts1 The Lounge 14 12-23-2012 01:47 PM
Name that Eco Car! Quiz: identify these aerodynamic production cars MetroMPG Aerodynamics 16 08-30-2009 06:24 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com