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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-18-2011, 05:56 PM   #11 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,963
Thanks: 20,775
Thanked 6,340 Times in 3,936 Posts
'compress'

Quote:
Originally Posted by redneck View Post
I talked with a representative of Smart Truck today. I asked him the purpose of part C. He explained to me that part C was a rear diffusser and that the whole Under Tray System was designed to compress and tunnel the air. Thus speeding it up before entering the low pressure area. If you look closely at the bottom of part C you will notice a slight downward angle that helps with final compression.

I told him about this website so maybe he will chime in later.



>
He probably should not use the 'compress' and compression' as terms to describe what his product does.This phenomena would not begin to occur until around 250 mph.
Better that he should say it 'accelerates' the flow which actually lowers its pressure.
It's hard to imagine that it does anything other than ride in the wake of the first component ahead of the wheels and the wheels themselves.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-19-2011, 11:43 AM   #12 (permalink)
Making Ecomods a G thing
 
Join Date: Jan 2011
Location: Illinois
Posts: 655

Angie - '08 Infiniti G35 X
90 day: 22.03 mpg (US)
Thanks: 35
Thanked 74 Times in 57 Posts
Quote:
Originally Posted by aerohead View Post
He probably should not use the 'compress' and compression' as terms to describe what his product does.This phenomena would not begin to occur until around 250 mph.
Better that he should say it 'accelerates' the flow which actually lowers its pressure.
It's hard to imagine that it does anything other than ride in the wake of the first component ahead of the wheels and the wheels themselves.
He should have just said the Venturi Effect
__________________

  Reply With Quote
Old 02-20-2011, 05:50 PM   #13 (permalink)
Master EcoModder
 
redneck's Avatar
 
Join Date: Jun 2009
Location: SC Lowcountry
Posts: 1,600

Geo XL1 - '94 Geo Metro
Team Metro
Boat tails and more mods
90 day: 72.22 mpg (US)

Big, Bad & Flat - '01 Dodge Ram 3500 SLT
Team Cummins
90 day: 21.13 mpg (US)
Thanks: 206
Thanked 1,250 Times in 638 Posts
Quote:
Originally Posted by aerohead View Post
He probably should not use the 'compress' and compression' as terms to describe what his product does.This phenomena would not begin to occur until around 250 mph.
Better that he should say it 'accelerates' the flow which actually lowers its pressure.
It's hard to imagine that it does anything other than ride in the wake of the first component ahead of the wheels and the wheels themselves.
I may have interpreted what he said and came up with the word compress on my own.

The trailer pictured has sliding tandems. They are normally slid foward for city driving (less turning radius) and slid back for highway use or anywhere in between to get the correct maximum weight per axle allowed by law.

When the tandem is slid back for highway use, the reason for having part C in the system then becomes more apparent. IMHO.

>
  Reply With Quote
The Following User Says Thank You to redneck For This Useful Post:
aerohead (02-21-2011)
Old 02-21-2011, 05:50 PM   #14 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,963
Thanks: 20,775
Thanked 6,340 Times in 3,936 Posts
venturi

Quote:
Originally Posted by Joenavy85 View Post
He should have just said the Venturi Effect
I see where you're going,but I believe that without an 'enclosed system' which a venturi is dependent upon,there is nothing present( as the wall of a carburetor) in the local flow environment to 'force' the acceleration around or under.
  Reply With Quote
Old 02-22-2011, 02:58 AM   #15 (permalink)
Mechanical engineer
 
Vekke's Avatar
 
Join Date: Jan 2009
Location: Kitee (Finland)
Posts: 1,107

Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
Diesel
90 day: 104.94 mpg (US)

A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual
90 day: 64.64 mpg (US)

Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L
90 day: 54.57 mpg (US)

Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual
90 day: 32.98 mpg (US)

A2 1.4TDI - '03 Audi A2 1.4 TDI
90 day: 45.68 mpg (US)

A2 1.4 LPG - '02 Audi A2 1.4 (75hp)
90 day: 28.67 mpg (US)
Thanks: 222
Thanked 622 Times in 287 Posts
Quote:
Originally Posted by aerohead View Post
That's the $Trillion idea! If you're first to the Patent Office and you can obtain venture capital for commercial production you'll amass a fortune that would make Xerxes blush.
I dont know if same patent laws apply to states, but in europe if you say your idea that clear in some forum you cannot apply anymore patents to that idea...

There are trailers already in europe which look like boattails, so it would be very hard to get patent for something which you just do more longer boattail.
__________________


https://www.linkedin.com/in/vesatiainen/

Vesa Tiainen innovation engineer and automotive enthusiast
  Reply With Quote
Old 02-22-2011, 06:04 PM   #16 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 12,963
Thanks: 20,775
Thanked 6,340 Times in 3,936 Posts
photos?

Quote:
Originally Posted by Vekke View Post
I dont know if same patent laws apply to states, but in europe if you say your idea that clear in some forum you cannot apply anymore patents to that idea...

There are trailers already in europe which look like boattails, so it would be very hard to get patent for something which you just do more longer boattail.
Vekke,if you come across any photos of these trailers it would be great for you to post them.
Once a person can 'see' that something has actually been done,it somehow validates the concept,and all of a sudden it's worthy of application.
  Reply With Quote
Old 02-23-2011, 01:25 PM   #17 (permalink)
Mechanical engineer
 
Vekke's Avatar
 
Join Date: Jan 2009
Location: Kitee (Finland)
Posts: 1,107

Siitin - '98 Seat Cordoba Vario
90 day: 58.56 mpg (US)

VW Lupo 3L --> 2L - '00 VolksWagen Lupo 3L
Diesel
90 day: 104.94 mpg (US)

A8 luxury fuel sipper - '97 Audi A8 1.2 TDI 6 speed manual
90 day: 64.64 mpg (US)

Audi A4B6 Avant Niistäjä - '02 Audi A4b6 1.9tdi 96kW 3L
90 day: 54.57 mpg (US)

Tourekki - '04 VW Touareg 2.5TDI R5 6 speed manual
90 day: 32.98 mpg (US)

A2 1.4TDI - '03 Audi A2 1.4 TDI
90 day: 45.68 mpg (US)

A2 1.4 LPG - '02 Audi A2 1.4 (75hp)
90 day: 28.67 mpg (US)
Thanks: 222
Thanked 622 Times in 287 Posts
No personal photos, but is this enough for starters?

Radical Aerodynamic Semi Truck With 0.29 Cd Offers Dramatic Fuel Savings | The Truth About Cars

not so curvy kammback trailers is on finnish roads. I dont know if someone has modified his own trailer or do some trailer company build that kind of models :/. I will try to remember take some pictures next time I see one.
__________________


https://www.linkedin.com/in/vesatiainen/

Vesa Tiainen innovation engineer and automotive enthusiast
  Reply With Quote
The Following User Says Thank You to Vekke For This Useful Post:
aerohead (05-30-2013)
Old 02-23-2011, 01:37 PM   #18 (permalink)
aero guerrilla
 
Piwoslaw's Avatar
 
Join Date: Oct 2008
Location: Warsaw, Poland
Posts: 3,538

Svietlana II - '13 Peugeot 308SW e-HDI 6sp
90 day: 58.1 mpg (US)
Thanks: 1,056
Thanked 630 Times in 396 Posts
DHL teardrop trailer - Google Image Search

__________________
e·co·mod·ding: the art of turning vehicles into what they should be

What matters is where you're going, not how fast.

"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell

Piwoslaw's Peugeot 307sw modding thread

  Reply With Quote
The Following User Says Thank You to Piwoslaw For This Useful Post:
aerohead (05-30-2013)
Old 02-23-2011, 01:55 PM   #19 (permalink)
Making Ecomods a G thing
 
Join Date: Jan 2011
Location: Illinois
Posts: 655

Angie - '08 Infiniti G35 X
90 day: 22.03 mpg (US)
Thanks: 35
Thanked 74 Times in 57 Posts
Quote:
Originally Posted by aerohead View Post
I see where you're going,but I believe that without an 'enclosed system' which a venturi is dependent upon,there is nothing present( as the wall of a carburetor) in the local flow environment to 'force' the acceleration around or under.
i should have stated that as a general description, not a literal term(for example, standing between 2 building will cause you to experience an increased wind velocity but technically isn't a venturi since it's not enclosed). reduce the area for the fluid to flow through and you will increase it's velocity, and reduce it's pressure, likely that piece on the back wouldn't do very much of that since it's no in contact with the ground and therefore doesn't fully enclose the air path underneath, but it is close
__________________

  Reply With Quote
The Following User Says Thank You to Joenavy85 For This Useful Post:
aerohead (05-30-2013)
Old 05-29-2013, 04:21 PM   #20 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,878
Thanks: 52
Thanked 2,589 Times in 1,814 Posts
Another whole truck aero-design.

Huw Evans | Sep 17, 9:02 AM
MAN Concept S Adds Aerodynamics to Big Rig Cab; Looks Like Optimus Prime’s Head | AutoGuide.com News

__________________
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
Reply  Post New Thread


Thread Tools




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