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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-05-2012, 11:11 AM   #21 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,340
Thanks: 2,690
Thanked 937 Times in 556 Posts
Your car is much like the Ale' - both are even Honda powered.
I think the flanks on the Ale' might give some inspiration :


  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-05-2012, 11:14 AM   #22 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,340
Thanks: 2,690
Thanked 937 Times in 556 Posts
BTW, I like your version much better.
  Reply With Quote
Old 06-05-2012, 11:27 AM   #23 (permalink)
Master EcoModder
 
Join Date: Dec 2011
Location: Boise Idaho
Posts: 842
Thanks: 39
Thanked 89 Times in 69 Posts
thanks Cd - I did look long and hard at the Ale, and it has some great features.

I chose to have doors and windows which roll up and down so some things obviously are different.

I'll get some more pics today.
  Reply With Quote
Old 06-05-2012, 03:18 PM   #24 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,891

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: 3,423
Thanked 2,914 Times in 1,827 Posts
Somehow I missed the similarities with the FVT eVaro (formerly know as the Alé). It has a hinged canopy that has a "fat" portion:




Another X-Prize vehicle that is even closer to the the layout of your trike is the Zap Alias:

__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
The Following User Says Thank You to NeilBlanchard For This Useful Post:
Cd (06-05-2012)
Old 06-05-2012, 07:15 PM   #25 (permalink)
Master EcoModder
 
kach22i's Avatar
 
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 3,882
Thanks: 54
Thanked 2,590 Times in 1,815 Posts
The "Zap" is an excellent compariable.

I think the following can also be lumped in there with Doug Miller's design. If we can find the Cd's of these cars, maybe we can make an educated guess about Doug's Cd.

Razor...........lots of turbulence coming off those front wheels.
Razor at stoneleigh...


I know this has four wheels, and is open on the sides and top, but mass wise it's in the same ballpark, and lot of drag coming off those wheel flares.
Kit Cars [group] most recent on FlickeFlu


Drag off the front wheels seems to be a part of most traditional 3-wheel trikes.

EDIT: According to this the Edision-2 had a coefficient of drag of 0.16

X Prize Winners Look Weird ... With Good Reason | Autopia | Wired.com

I read elsewhere, that the Zap World car made the top five finalist. So how bad could their aerodynamics possibly be? An exposed rear wheel, and drag inducing front wheel farings not too dissimilar to Doug's, I'd say he might be better off than we first thought.
__________________
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; 06-05-2012 at 07:42 PM..
  Reply With Quote
Old 06-05-2012, 07:46 PM   #26 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,462
Thanks: 188
Thanked 253 Times in 191 Posts
I'm thinking the Cd would be on the order of 0.4. But the small frontal area will make up for quite a bit.

No specific reasons, but I see lots of places for vortexes to form and for flow to be disrupted.

I would think that overall drag would be quite good, but more because frontal area is very low than because of a low Cd.

-soD
  Reply With Quote
Old 06-06-2012, 03:48 AM   #27 (permalink)
Drive less save more
 
ecomodded's Avatar
 
Join Date: Jul 2011
Location: Vancouver Island, Canada
Posts: 1,189

Dusty - '98 VOLKSWAGEN Beetle TDI
TEAM VW AUDI Group
90 day: 60.42 mpg (US)
Thanks: 134
Thanked 162 Times in 135 Posts
I'm taking the other side of the fence with the Cd values, The only thing in the wind is the front end. The middle and rear end are traveling behind a wind block, the amount of drag induced by that end will be next to non existent,it takes advantage of the otherwise wasteful large wake.

My car has a 0.38 Cd so my guesstimate is it has to be more then 1/3 less drag then my beetle, more like 1/2 so the Cd is about 19.
__________________
Save gas
Ride a Mtn bike for errands exercise entertainment and outright fun
__________________



  Reply With Quote
Old 06-06-2012, 04:16 AM   #28 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,340
Thanks: 2,690
Thanked 937 Times in 556 Posts
I'm going to guess that the Cd will be between .10 - .50 .
  Reply With Quote
Old 06-06-2012, 04:23 AM   #29 (permalink)
Cd
Ultimate Fail
 
Cd's Avatar
 
Join Date: Feb 2008
Location: Austin,Texas
Posts: 3,340
Thanks: 2,690
Thanked 937 Times in 556 Posts
All joking aside, I don't think we have enough data to make an educated guess.
I agree that there is most certainly going to be major turbulence just behind the front fender.

Is this a running vehicle capable of doing a tuft test ?
  Reply With Quote
Old 06-06-2012, 11:33 AM   #30 (permalink)
Master EcoModder
 
Sven7's Avatar
 
Join Date: Aug 2011
Location: Warren, MI
Posts: 2,456

Boo Radley - '65 Ford F100
90 day: 13.28 mpg (US)
Thanks: 782
Thanked 665 Times in 408 Posts
Hood.



As far as the low pressure zone is concerned, have you considered doing a "soft" body panel that would flex as you open the door and stay taut when it's closed? The BMW GINA used this to great effect, if you're not familiar.



Yours wouldn't have to be as complicated as that but I could see using a few strategic structural lines covered in some sort of treated canvas (like old airplanes) to create a "good-enough" body surface that anchors on the Civic door. This would do what Skyking was talking about, but would not interfere with ingress/egress.

Now, it's not going to be a quick project, but I think if you gave it some time and played around a little it could be pretty cool, and work well too.

Please don't reply to this with a sarcastic remark or personal attack. I'm just trying to help. Thanks.

__________________
He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
  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