HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Engineering Materials

Metal/Plastic Car Wheel Boosts MPG

NO RATINGS
View Comments: Oldest First|Newest First|Threaded View
<<  <  Page 4/4
evolvewheel
User Rank
Iron
eVOLVE hybrid wheel philosophy
evolvewheel   2/14/2013 9:44:33 PM
NO RATINGS
Our testing shows that completely covering the wheel achieves better aerodynamics, that said cooling and design is compromised so it is not a realistic option. Wheels are as emotional as they are functional – especially considering the side on visual impact of the vehicle. The eVOLVE hybrid wheel philosophy is to balance, weight, aerodynamics, design and finishes all at the same time. We believe composite wheel technology provides the ultimate method to balance all attributes as best possible.

 

Ann R. Thryft
User Rank
Blogger
Re: eVOLVE hybrid wheel philosophy
Ann R. Thryft   2/19/2013 3:12:19 PM
NO RATINGS
Thanks to Lacks (James, I believe that's you commenting here) for weighing in on the testing issues, as well as giving us more info on the design tradeoffs between aerodynamics, cooling and esthetics issues.

evolvewheel
User Rank
Iron
Re: eVOLVE hybrid wheel philosophy
evolvewheel   2/19/2013 3:19:25 PM
NO RATINGS
Thank you Ann for inviting us to provide additional information here.  There have been some excellent and insightful comments made by the readers and clarification is always good for both parties.  If further information is required, your readers can visit us at www.evolvehybrid.com or stop by booth 325 at the upcoming SAE World Congress in Detroit, April 16-18 for a first hand look at the eVOLVE hybrid wheel. 

cookiejar
User Rank
Platinum
drag and weight
cookiejar   2/20/2013 10:01:01 AM
NO RATINGS
The Citroen SM, introduced in 1972 had composite wheels as an option, but they really didn't catch on.  Citroen was also known for its low drag aerodynamic designs tested in its wind tunnel that had a moving conveyor belt, as they maintained that the interface between the car bottom and the road had the greatest wind shear and hence presented the greatest drag.  All Citroens, including the ugly 2CV had very smooth bellies.

If weight is important in the wheel tire assembly, then perhaps tire weight deserves another look.  I've noticed incredible weight differences between different tires of the same size.  I've also noticed that the heavier tires really bounce when dropped.  Unsprung weight has significant effects on handling on uneven surfaces as well as ride.

The latest fashion for low profile tires reduces the amount of rubber and air cushion and increase the amount of rim.

So many variables!

cookiejar
User Rank
Platinum
Re: drag and weight
cookiejar   2/20/2013 10:29:57 AM
NO RATINGS
Speaking of aerodynamics, both the Citroen SM and the (1954 - 1972) DS featured full and smooth wheel covers.  Brake cooling was by separate ducts to inboard transaxle mounted disc brakes.  Brake fade was unmeasrable.  Interestingly, with front wheel drive, the very reliable CV drive shafts took the full force of braking - much higher than engine output.  These FWD transaxles and components were a favorite of formula 1 cars for many years when used in the rear.

I find the engineering of Citroen awe inspiring because they certainly marched to a different drummer well ahead of the mob.  The Citroen DS, which has more leg and head room than my 4050 lb Buick Lucerne weighed in at an amazing 2700 lbs.  The current Fiat 500 weighs in at 2600 lbs.  With its self adjusting air/hydraulic suspension, the DS rode perfectly under all loads, superior to my 2007 Lucerne CXS's magnetic ride. 

Ann R. Thryft
User Rank
Blogger
Re: drag and weight
Ann R. Thryft   2/20/2013 12:54:39 PM
NO RATINGS
cookiejar, I had a similar thought when researching this article--how incredibly complex the process is of analyzing all the variables and how they interact. Thanks for the input on the Citroen wheels. Interesting to know that such design considerations--aerodynamics and materials--were being looked at back then. I wonder if that's the Citroen model my husband and I rented in France in 1974.

<<  <  Page 4/4
Partner Zone
More Blogs from Engineering Materials
The FDA has just released draft guidelines for using 3D printing in the design, development, and manufacture of regulated medical products. Although the recommendations are non-binding, they do set some much-needed parameters.
Coatings and sealants are getting more versatile to deal with miniaturization and multiple materials, and tougher to meet requirements for higher reliability.
Improved simulation and analysis tools are helping to develop more and better once-exotic alloys, plus good old aluminum, for lighter aerospace designs with less waste.
HP's industry-changing 3D printing announcement for commercial-scale end-production wasn't the only news of note at RAPID 2016 this week. Here are six more game-changing software and hardware news items, plus some videos explaining HP's technology.
HP has launched its long-heralded Multi Jet Fusion 3D printing technology for commercial-scale end-production, plus an ecosystem to go with it. The package could change the entire industrial market for making end-products with additive manufacturing. At the very least, it will be game-changing.
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service