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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-23-2012, 05:43 PM   #11 (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 667 Times in 409 Posts
Quote:
Originally Posted by Frank Lee View Post
I'd call Sven's proposal (c)- it looks quite good... now put radii on the leading and upper edges.
Thank you. I didn't put radii on partly because I'm pressed for time and partly because building a consistent radius in real life would probably be a struggle with metal HVAC ducting, if you could even pull it off. I'd go sans the radii and see how it does. With that shape it should give some pretty awesome mileage right out of the box

__________________
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
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-23-2012, 05:46 PM   #12 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
Quote:
Originally Posted by Sven7 View Post
Depends what Ed wants to make- an aero pull-behind that also hauls cargo, or a trailer that is also aerodynamic. Yours, Frank, is the former, and mine is the latter. Two different ways to approach the same problem.
Hah?
__________________


  Reply With Quote
Old 02-23-2012, 05:50 PM   #13 (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 667 Times in 409 Posts
Quote:
Originally Posted by Frank Lee View Post
Hah?
It's a statement about sacrifices. You can have great aero or great cargo capacity... the more of one, the less of the other.

I decided to design a trailer with decent aero and decent capacity.
__________________
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
Old 02-23-2012, 05:52 PM   #14 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
I described the same thing you sketched. It's a convergence, like it or not.
__________________


  Reply With Quote
Old 02-23-2012, 05:53 PM   #15 (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 667 Times in 409 Posts
K. I didn't worry about "[keeping] the front of the trailer to the back of the tow vehicle". But they accomplish the same goal.
__________________
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
Old 02-23-2012, 06:31 PM   #16 (permalink)
EcoModding Lurker
 
Ed-in-Maine's Avatar
 
Join Date: Feb 2012
Location: Maine
Posts: 69

Iceberg - '02 Ford F250 XLT
Pickups
90 day: 18.3 mpg (US)

Tool - '08 Toyota Matrix XR
Team Toyota
90 day: 43.15 mpg (US)
Thanks: 24
Thanked 18 Times in 7 Posts
That's a nice design you built Sven7. I have a hard time seeing how the interior accommodations would be installed. Bed and Galley. Can I get that model in to Sketchup to play with?

And yes radii at edges are better BUT, ease of construction is also a requirement. A radius in one direction is easy, two is very hard, given time, materials and tools at hand. That's why I was curious which direction of leading edge might be better, horizontal vs vertical.

I like the idea of bringing the trailing edge up to aero profile and chopping the end off. I'm limited to about 10'-12' total length.

Does anyone know if that aero shape is in the Google Sketch up library? And if so the name.

This camper is to be towed 90+% of the time behind a small car like our Toyota Matrix hence the limited size and weight.
Thanks for the input.
Ed
  Reply With Quote
Old 02-23-2012, 06:45 PM   #17 (permalink)
(:
 
Frank Lee's Avatar
 
Join Date: Jan 2008
Location: up north
Posts: 12,762

Blue - '93 Ford Tempo
Last 3: 27.29 mpg (US)

F150 - '94 Ford F150 XLT 4x4
90 day: 18.5 mpg (US)

Sport Coupe - '92 Ford Tempo GL
Last 3: 69.62 mpg (US)

ShWing! - '82 honda gold wing Interstate
90 day: 33.65 mpg (US)

Moon Unit - '98 Mercury Sable LX Wagon
90 day: 21.24 mpg (US)
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
I think a or c or some blend thereof for the front, and c for the back would work best behind the Matrix.
__________________


  Reply With Quote
Old 02-23-2012, 07:07 PM   #18 (permalink)
EcoModding Lurker
 
Ed-in-Maine's Avatar
 
Join Date: Feb 2012
Location: Maine
Posts: 69

Iceberg - '02 Ford F250 XLT
Pickups
90 day: 18.3 mpg (US)

Tool - '08 Toyota Matrix XR
Team Toyota
90 day: 43.15 mpg (US)
Thanks: 24
Thanked 18 Times in 7 Posts
Sorry I've lost track of a,b,c. Here is a new model incorporating the raised rear.
Do these look better?
Thanks
Ed
Attached Thumbnails
Click image for larger version

Name:	Teardrop HF 1947.jpg
Views:	465
Size:	62.7 KB
ID:	10332  
  Reply With Quote
Old 02-23-2012, 07:31 PM   #19 (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 667 Times in 409 Posts
Still way too steep of an angle at the rear. Can you insert canvas images into Sketchup to build over? If so, do that. If not, overlay the aero template from last page until it matches. Print them out if need be. I posted that image because it's pretty close to the "perfect" low drag vehicle shape. Any steeper an angle will detach the airflow, resulting in eddies and vortexes.

I don't know how to build in Sketchup or convert from Alias, if it's even possible. The best way to do it would be building over an image. Also, if you're making it 4x4x10, define those dimensions in the model! My model is built almost exactly to those dimensions and you can see how much longer it is than either A or B. (That is, unless 4' is measured from the axle up)

If you only make a curve in one direction I'd do A because it will have a smaller frontal area in crosswinds.

Edit: As far as accommodations go, you should be able to fit a bed in there with a little space to walk around, especially if you cantilever the body over the wheels for an extra 10 inches or so.
__________________
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

Last edited by Sven7; 02-23-2012 at 07:52 PM..
  Reply With Quote
Old 02-23-2012, 08:08 PM   #20 (permalink)
EcoModding Lurker
 
Ed-in-Maine's Avatar
 
Join Date: Feb 2012
Location: Maine
Posts: 69

Iceberg - '02 Ford F250 XLT
Pickups
90 day: 18.3 mpg (US)

Tool - '08 Toyota Matrix XR
Team Toyota
90 day: 43.15 mpg (US)
Thanks: 24
Thanked 18 Times in 7 Posts
Sven7-Thanks I figured out getting that aero image in to sketchup. And WOW I didn't think the trailing edge would be that high. With the rear that high I have to really rethink the layout.

As for accommodations I should have been clearer. Bed for two, min 48" wide 6ft long.
Thanks
Ed

Attached Thumbnails
Click image for larger version

Name:	Teardrop HF 1947.jpg
Views:	361
Size:	122.2 KB
ID:	10333  
  Reply With Quote
Reply  Post New Thread


Thread Tools




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