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Forum: Aerodynamics

04-12-2010, 06:31 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

Hello, Jason, That is a very good idea. No...

Hello, Jason,

That is a very good idea. No tests of that sort have been done by me. I will try it some time this summer. Or, any students out there looking for a research project? I think this...

Forum: General Efficiency Discussion

01-08-2010, 12:29 PM

Replies: 9

Paper on engine efficiency

Views: 2,774

Posted By Ernie Rogers

Abstract of paper

I think that should be okay. Here it is--

AN INTERNAL COMBUSTION ENGINE FOR THE FUTURE

Ernest Rogers

The essence of life is an orderly consumption of energy. As earth's energy...

Forum: Aerodynamics

05-17-2009, 11:02 PM

Replies: 18

Coast down test methods and determining cD?

Views: 8,324

Posted By Ernie Rogers

I see a lot of good ideas here. Here are my...

I see a lot of good ideas here. Here are my additional thoughts--

I just did mine with a stopwatch that collects multiple times (actually, my sport watch). I timed at 10 mph intervals from 70 to...

Forum: Aerodynamics

05-17-2009, 10:35 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

Thanks

Thanks, guys, for the nice compliments.

The photos were taken before I screwed up the paint job last summer. It seems to work fine; I'll get around to re-painting one of these days.

Ernie

Forum: Aerodynamics

05-17-2009, 10:32 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

The story behind the winglets

I think it was about 1978, I was sitting at the same table with Peter Lissaman of Aerovironment. I told a story I thought was funny about a school teacher that said we should put a wind turbine on a...

Forum: Aerodynamics

05-17-2009, 10:12 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

Calculated mpg matches measurement

Now, the rest of the story--

Last summer, I measured my fuel economy very carefully. My "test track" was I-80 from the Toole truck stop near Salt Lake City to the Wendover, Nevada, exit and...

Forum: Aerodynamics

05-17-2009, 07:50 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

Beetle drag reducer picks up 5 to 8 %

This is a hard question for me. The reason is I'm not 100% sure.

Shortly after building the wing, I tested it very carefully and got a 3 mpg improvement no matter what my speed was. (At 60 mph,...

Forum: Aerodynamics

05-17-2009, 12:52 AM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

First set of pictures

The first picture shows the plan of the center shelf. It's about 20 inches wide x 42 inches long, closely follows the rear shape.

Second picture shows shelf profile at one end.

Third picture...

Forum: Aerodynamics

05-16-2009, 10:59 PM

Replies: 20

Describing my Beetle wing (VW New Beetle)

Views: 12,635

Posted By Ernie Rogers

Describing my Beetle wing (VW New Beetle)

I started working on the wing within a few months after buying the car in 2003. I spent a few weeks reading all the journal articles I could find on the connection between rear shape and drag. From...

Forum: Aerodynamics

05-06-2009, 02:08 PM

Replies: 206

Sticky: CdA list

Views: 245,969

Posted By Ernie Rogers

I did a coast-down on my modified Beetle

I measured the Cd of my modified 2003 Beetle some years back. (By coast-down) I have my calculations around here somewhere, but no clue where to find them. Result: Cd = 0.31 with the...

Forum: General Efficiency Discussion

04-09-2009, 02:32 PM

Replies: 69

Discussion on tire efficiency

Views: 26,400

Posted By Ernie Rogers

Discussion on tire efficiency

Hello, folks,

Two discussions about tire efficiency have been going for a few days. This is an effort to consolidate into one clearly-labeled thread, and maybe give some useful information. The...

Forum: EcoModding Central

04-09-2009, 02:08 PM

Replies: 20

Introducing myself

Views: 3,949

Posted By Ernie Rogers

Notice: As suggested, I will start a new thread...

Notice: As suggested, I will start a new thread on tire selection. For that purpose, I will post a "lesson" I did some years back on the topic of tire efficiency.

Ernie Rogers

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