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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-22-2011, 11:24 AM   #21 (permalink)
Recreation Engineer
 
KamperBob's Avatar
 
Join Date: Dec 2009
Location: Somewhere USA
Posts: 525

Black Stallion - '02 Toyota Tundra 4WD xCab

Half Pint - '06 Yamaha XT225
Thanks: 333
Thanked 138 Times in 103 Posts
t vago, what's the benefit of the tight-radius inside corners and flat tonneau-like surface between the raised portion and bed walls. I'm skeptical flow would attach that deeply into those gullies. Why not use larger fillets instead?

__________________
Recreation Engineer
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-22-2011, 12:09 PM   #22 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Hungary
Posts: 1,807

iNXS - '10 Opel Zafira 111 Anniversary

Suzi - '02 Suzuki Swift GL
Thanks: 830
Thanked 708 Times in 456 Posts
Quote:
Originally Posted by BamZipPow View Post
Are you gonna put in a rear window? Is this one gonna be hinged/have a hatch so you have access to the bed?
Eventually. The foam shape has to be made, and that will not have any of the functionality you mentioned. However, the foam shape can be removed in about 20 seconds, and can be lifted with 1 hand. Version 1 fit this requirement rather easily.

Hm... Just had the strangest idea for using my existing tonneau side rails to secure the aerocap, so that it could be removed in 2 seconds instead of 20.
  Reply With Quote
Old 01-22-2011, 12:15 PM   #23 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Hungary
Posts: 1,807

iNXS - '10 Opel Zafira 111 Anniversary

Suzi - '02 Suzuki Swift GL
Thanks: 830
Thanked 708 Times in 456 Posts
Quote:
Originally Posted by KamperBob View Post
t vago, what's the benefit of the tight-radius inside corners and flat tonneau-like surface between the raised portion and bed walls. I'm skeptical flow would attach that deeply into those gullies. Why not use larger fillets instead?
Heh... See, now you're picking on my poor man's CAD program. There's only so much I programmed into that Excel spreadsheet.

You'll notice that the curves on version 1 were a bit gentler than in the Excel workup.


Excel workup


Real life 1


Real life 2

That was one of the reasons I decided to use FoamulaR sheeting. It can be curved to form compound curves fairly easily, as long as the underlying frame shape can support the minimum bending requirements.
  Reply With Quote
Old 01-22-2011, 12:28 PM   #24 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907

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: 3,475
Thanked 2,950 Times in 1,844 Posts
I tend to agree with Bob -- the trailing shape of the tailgate would be "cleaner" I think if the entire surface of the cap was tapered down; so the air flow over the truck as a whole was improved. Like the shape that others have done -- though I do like the look of this project. So, maybe a combination?

I'll attempt something is SketchUp -- which has an excellent free version, by the way. And, this would deepen the ribs nearer the back, too I think?
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 01-22-2011, 12:38 PM   #25 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 287 Times in 200 Posts
There's an engineer at work we like to pick on for doing all of his analytical work in Excel. But Excel as a CAD program? That's ... very MacGyveresque.
  Reply With Quote
Old 01-22-2011, 01:49 PM   #26 (permalink)
Recreation Engineer
 
KamperBob's Avatar
 
Join Date: Dec 2009
Location: Somewhere USA
Posts: 525

Black Stallion - '02 Toyota Tundra 4WD xCab

Half Pint - '06 Yamaha XT225
Thanks: 333
Thanked 138 Times in 103 Posts
A spreadsheet is the Swiss Army Knife of application software. From poor man's database to poor man's CAD. Two plus decades ago I used spreadsheets to clean up the coordinates of industrial robots for example.

t vago, I wasn't picking at all. I would like to understand your motivation for gullies on the sides. Is the ole tear-back look an aesthetic goal for example? Inquiring minds want to know.
__________________
Recreation Engineer
  Reply With Quote
Old 01-22-2011, 02:07 PM   #27 (permalink)
Recreation Engineer
 
KamperBob's Avatar
 
Join Date: Dec 2009
Location: Somewhere USA
Posts: 525

Black Stallion - '02 Toyota Tundra 4WD xCab

Half Pint - '06 Yamaha XT225
Thanks: 333
Thanked 138 Times in 103 Posts
Quote:
Originally Posted by NeilBlanchard View Post
I tend to agree with Bob -- the trailing shape of the tailgate would be "cleaner" I think if the entire surface of the cap was tapered down; so the air flow over the truck as a whole was improved. Like the shape that others have done -- though I do like the look of this project. So, maybe a combination?

I'll attempt something is SketchUp -- which has an excellent free version, by the way. And, this would deepen the ribs nearer the back, too I think?
Neil, like this?

__________________
Recreation Engineer
  Reply With Quote
Old 01-22-2011, 02:39 PM   #28 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Hungary
Posts: 1,807

iNXS - '10 Opel Zafira 111 Anniversary

Suzi - '02 Suzuki Swift GL
Thanks: 830
Thanked 708 Times in 456 Posts
Quote:
Originally Posted by KamperBob View Post
t vago, I wasn't picking at all. I would like to understand your motivation for gullies on the sides. Is the ole tear-back look an aesthetic goal for example? Inquiring minds want to know.
I know, I was just trying to make a funny.

Anyway, I have noticed in the past, when my tonneau cover was covered with snow, the obvious thing that air wants to flow down from the roof of the cab. I also noticed that air wants to flow back toward the centerline of the bed from the sides. Who am I to argue with Mother Nature?

Also, from reading that other grad paper that was posted yesterday in this forum, I noted that the traditional 12 degree sloped aerocap was good for a reduction in C(d) of 16.2%. Sloping the sides, like what I am going to do, resulted in a reduction in C(d) of 19.8%. To me, the math makes sense.
  Reply With Quote
Old 01-22-2011, 02:55 PM   #29 (permalink)
MPGuino Supporter
 
t vago's Avatar
 
Join Date: Oct 2010
Location: Hungary
Posts: 1,807

iNXS - '10 Opel Zafira 111 Anniversary

Suzi - '02 Suzuki Swift GL
Thanks: 830
Thanked 708 Times in 456 Posts


This guy had a similar idea for his Nissan. I think, though, I could live without the huge wing.

And Ecomodder member ChazInMT had a similar idea, too.

  Reply With Quote
Old 01-22-2011, 03:32 PM   #30 (permalink)
T-100 Road Warrior
 
BamZipPow's Avatar
 
Join Date: Apr 2008
Location: The Woodlands, TX
Posts: 1,921

BZP T-100 (2010) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 24 mpg (US)

BZP T-100 (2011) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 23.66 mpg (US)

BZP T-100 (2009) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 19.01 mpg (US)

BZP T-100 (2012) - '98 Toyota T-100 ext cab - 3.4L/auto SR5
Last 3: 25.45 mpg (US)

BZP T-100 (2013) - '98 Toyota T-100 SR5
Last 3: 25.79 mpg (US)

BZP T-100 (2014) - '98 Toyota T-100 SR5
Last 3: 23.18 mpg (US)

BZP T-100 (2015) - '98 Toyota T-100 SR5
Last 3: 23.85 mpg (US)

BZP T-100 (2016) - '98 Toyota T-100 SR5
Last 3: 17.62 mpg (US)

BZP T-100 (2017) - '98 Toyota T-100 SR5
90 day: 20.78 mpg (US)

BZP T-100 (2018) - '98 Toyota T-100 SR5
90 day: 20.19 mpg (US)

BZP T-100 (2019) - '98 Toyota T-100 SR5

BZP T-100 (2020) - '98 Toyota T-100 SR5

2012 Scion iQ - '12 Scion iQ Base
Thanks: 3,502
Thanked 1,395 Times in 968 Posts
Send a message via ICQ to BamZipPow
The Nissan rally truck didn't always sport the rear wing...

  Reply With Quote
Reply  Post New Thread


Tags
aerocap, aerodynamic, aeroshell, dakota, truck





Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com