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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 03-30-2017, 05:31 PM   #1 (permalink)
EcoModding Lurker
 
D15r's Avatar
 
Join Date: Aug 2016
Location: New Zealand
Posts: 22

Civr - '95 Honda Civic Ri

tinkerbell - '90 Honda integra xsi

smokey - '00 honda civic gli
90 day: 50.79 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
sharp edges on tail

So most cars have rounded trailing edges . This we know isn't the best for low drag. As I've learnt more about aeros I keep my eyes open for cars that have interesting aerodynamic features. I find it interesting since most people will find a square trailing edge unappealing simply because they don't have a care for aerodynamic function which sucks frankly.

So far I've seen the square rear edges on newish Subaru impresa hatch...strangely but mad respect to their design teams. Prius no surprises here but still go them. Audi fast back style saloon unexpected as detracts from styling.

I wonder if it is going to be more common to see more and more cars with this feature. I doubt it as like I mentioned from a styling point of view it doesn't really look aerodynamic or beautiful.

Being interested in boat design, I was thinking when we design boats they are either designed primarily for planning or displacement operation. Now how this relates to cars is that all cars operate in a pure displacement environment yet we design them as if we expect them to plane which is really stupid. So most of all our cars are dragging huge wakes behind them which we know is stupid, Strange eh.

  Reply With Quote
The Following User Says Thank You to D15r For This Useful Post:
aerohead (08-12-2017)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 03-30-2017, 05:46 PM   #2 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 2,527
Thanks: 3
Thanked 1,544 Times in 1,089 Posts
Quote:
Originally Posted by D15r View Post
Being interested in boat design, I was thinking when we design boats they are either designed primarily for planning or displacement operation. Now how this relates to cars is that all cars operate in a pure displacement environment yet we design them as if we expect them to plane which is really stupid. So most of all our cars are dragging huge wakes behind them which we know is stupid, Strange eh.
Interesting observations, I've seen it and thought along similar lines myself.

I suppose a fully submersible submarine is close to being in a continuous fluid, with air acting like a fluid as well.

The whole ground plane thing (pressure wave) really makes cars/truck unique, aircraft only experience this during take off and landing.
__________________
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 03-30-2017, 08:48 PM   #3 (permalink)
EcoModding Apprentice
 
LittleBlackDuck's Avatar
 
Join Date: Jul 2016
Location: The Land Downunder
Posts: 228

CT - '11 Lexus CT200h Luxury
Thanks: 26
Thanked 78 Times in 59 Posts
Quote:
Originally Posted by D15r View Post
So most cars have rounded trailing edges . This we know isn't the best for low drag. As I've learnt more about aeros I keep my eyes open for cars that have interesting aerodynamic features. I find it interesting since most people will find a square trailing edge unappealing simply because they don't have a care for aerodynamic function which sucks frankly.
Nope, some people want a car to just look nice. Beauty is in the eye of the beholder (beerholder? ). Practicality and safety is also taken into configuration by the manufacturer.

I own 3 different hybrid cars - Lexus RX450h, Lexus CT200h and Prius Gen 3. The shapes of each of them was conceived from a different perspective and I can appreciate each of them. The Prius' shape is unconventional but I appreciate it from the space that it adds in the interior as well as the lower drag that it offers.

Not everybody is turned on by an old and tatty looking Honda Insight that has skirts, grille block and a boat tail made from coroplast. I must admit that I would never drive such a conveyance, but I can still appreciate the effort made to reduce its drag and thus its fuel usage.

I also don't expect everybody to like nor agree with what I have chosen to own and drive, but we are all entitled to express ourselves.

Simon
  Reply With Quote
Old 03-31-2017, 06:35 AM   #4 (permalink)
Two weels Zero sparkplugs
 
Join Date: May 2016
Location: NL
Posts: 92
Thanks: 0
Thanked 38 Times in 25 Posts
Beer holder indeed:

  Reply With Quote
The Following 3 Users Say Thank You to Erasmo For This Useful Post:
aerohead (04-01-2017), chumly (08-13-2017), Gasoline Fumes (03-31-2017)
Old 08-11-2017, 01:04 PM   #5 (permalink)
EcoModding Lurker
 
D15r's Avatar
 
Join Date: Aug 2016
Location: New Zealand
Posts: 22

Civr - '95 Honda Civic Ri

tinkerbell - '90 Honda integra xsi

smokey - '00 honda civic gli
90 day: 50.79 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
I have to do the walk of shame and clean up what I was saying here.

I thought about this concept of relating car shape to boats displacement planning etc and I got lost somewhere. I forgot my point and so this post was off, basically I had a blonde moment and it has actually taken me sometime to return and fess up.

I see only 300 odd people have viewed so no harm done right.

Anyway to finish up I've been noticing a lot more square trailing edges on cars which I hadn't noticed or known about yet, gtr skyline corvette etc. So there is hope for our species after all, well not really but you all know what I mean.
  Reply With Quote
Old 08-11-2017, 01:27 PM   #6 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: Vermont
Posts: 1,967

Gaptooth - '00 Honda Insight
Team Honda
Gen-1 Insights
90 day: 69.77 mpg (US)

Work Van - '16 Chevy Express 2500
90 day: 17.37 mpg (US)
Thanks: 621
Thanked 707 Times in 457 Posts
I've considered adding sharp edges to the back of my Insight. I'm greatly inspired by OG VX:

  Reply With Quote
Old 08-12-2017, 04:22 AM   #7 (permalink)
EcoModding Lurker
 
D15r's Avatar
 
Join Date: Aug 2016
Location: New Zealand
Posts: 22

Civr - '95 Honda Civic Ri

tinkerbell - '90 Honda integra xsi

smokey - '00 honda civic gli
90 day: 50.79 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
Attached Thumbnails
Click image for larger version

Name:	Screenshot_2017-08-12-20-18-58.jpg
Views:	31
Size:	16.6 KB
ID:	22378  
  Reply With Quote
Old 08-12-2017, 11:48 AM   #8 (permalink)
...beats walking...
 
Old Tele man's Avatar
 
Join Date: Jul 2009
Location: Tucson, AZ
Posts: 5,945
Thanks: 160
Thanked 1,372 Times in 1,020 Posts
Yep, you want to 'trick' the airflow into abruptly horizontally-separating from the surface rather than 'clinging' to the the rounded surface as similarly happens at airfoil wingtips not having winglets.
__________________
2014 Toyota Prius 1.8L eCVT
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M

Last edited by Old Tele man; 08-12-2017 at 04:40 PM..
  Reply With Quote
Old 08-12-2017, 02:03 PM   #9 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 8,341
Thanks: 10,186
Thanked 4,377 Times in 2,426 Posts
trailing edge

Quote:
Originally Posted by D15r View Post
So most cars have rounded trailing edges . This we know isn't the best for low drag. As I've learnt more about aeros I keep my eyes open for cars that have interesting aerodynamic features. I find it interesting since most people will find a square trailing edge unappealing simply because they don't have a care for aerodynamic function which sucks frankly.

So far I've seen the square rear edges on newish Subaru impresa hatch...strangely but mad respect to their design teams. Prius no surprises here but still go them. Audi fast back style saloon unexpected as detracts from styling.

I wonder if it is going to be more common to see more and more cars with this feature. I doubt it as like I mentioned from a styling point of view it doesn't really look aerodynamic or beautiful.

Being interested in boat design, I was thinking when we design boats they are either designed primarily for planning or displacement operation. Now how this relates to cars is that all cars operate in a pure displacement environment yet we design them as if we expect them to plane which is really stupid. So most of all our cars are dragging huge wakes behind them which we know is stupid, Strange eh.
Kamm and Fachsenfeld advocated that the body follow the ideal streamline path and then wherever you want to terminate the length,just chop it as with a loaf of bread.
A current example is Mercedes' 2016 M-B IAA (with some stylistic license)

__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com