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Search took 0.06 seconds. Search: Posts Made By: kennybobby
Forum: Aerodynamics 05-31-2014, 04:25 PM
Replies: 21
Views: 5,203
Posted By aerohead
Airship Hulls

Here are some airship hulls,with position of maximum cross-section aligned,and normalized to a constant cross-section with the lower table,noses aligned with the first.They're all streamline bodies...
Forum: General Efficiency Discussion 05-29-2014, 02:52 AM
Replies: 23
Views: 4,096
Posted By California98Civic
Delete. But before it gets deleted, here is...

Delete.

But before it gets deleted, here is an XL1 on the streets of Manhattan:
...
Forum: Aerodynamics 05-03-2014, 06:07 PM
Replies: 18
Views: 7,042
Posted By gone-ot
Q: Why? A: the female human body!

Q: Why?

A: the female human body!
Forum: EcoModding Central 01-27-2014, 08:36 PM
Replies: 3
Views: 2,084
Posted By ever_green
My own BSFC chart using software from road dyno

Few months back I posted a thread about modifying my Drive By Wire maps to improve fuel efficiency (http://ecomodder.com/forum/showthread.php/drive-wire-throttle-tune-3-mpg-gain-more-27518.html). Now...
Forum: EcoModding Central 12-27-2013, 10:11 PM
Replies: 3
Views: 1,302
Posted By user removed
Flywheel P&G

Green Car Congress: NASA Glenn develops automated flywheel pulse-and-glide system; improving fuel economy up to 40-100% (http://www.greencarcongress.com/2013/12/20131227-glenn.html#comments)

I've...
Forum: Aerodynamics 11-06-2013, 04:53 PM
Replies: 7
Views: 1,867
Posted By aerohead
indications

*In elevation,Ford has done the K-form body,respecting boundary layer requirements for attached flow.
*In plan-view,they're borrowing from Paul Jaray's 1921 'Kombination-form' greenhouse.
*Both are...
Forum: Aerodynamics 10-21-2013, 03:22 PM
Replies: 28
Views: 6,585
Posted By RedDevil
Soon after the event, there was a lot of info...

Soon after the event, there was a lot of info about it - in Dutch. International media were slow to pick it up and went less deep itto the story (in general, I did not read the entire Internet).
...
Forum: Aerodynamics 10-20-2013, 11:32 AM
Replies: 28
Views: 6,585
Posted By jjackstone
"It looks like they had a clever 'starter'...

"It looks like they had a clever 'starter' motor--a big-legged sprinter pushing a thin inline skater pushing the vehicle. i reckon they might get him up to nearly 40 mph before he had to start...
Forum: Aerodynamics 10-19-2013, 02:29 PM
Replies: 28
Views: 6,585
Posted By aerohead
template

To me it's more of an extremely narrow elliptical fuselage morphing to a wing section trailing edge.Like a tuna.
Craig Vetter spoke of 'shrink-wrapping' the body around the necessary mechanical...
Forum: General Efficiency Discussion 10-16-2013, 05:04 PM
Replies: 0
Views: 1,917
Posted By ever_green
best BSFC vs. Vacuum (engine load) using software

Finally after months of research, phone calls, emails and other time wasting activities I got the information I needed to accurately simulate my engine's function using Engine analyzer pro. I also...
Forum: Hypermiling / EcoDriver's Ed 10-11-2013, 02:34 PM
Replies: 7
Views: 3,805
Posted By SentraSE-R
SGII shows best acceleration load....

SGII shows best acceleration load. (http://ecomodder.com/forum/showthread.php/sgii-shows-best-acceleration-load-19594.html) We need to know distance traveled and time to accelerate to speed to make...
Forum: Aerodynamics 01-14-2013, 11:07 PM
Replies: 1
Views: 1,661
Posted By ryannoe
Aerodynamic Flow Visualization Video

Hey guys,

I found this gem and a few others on Youtube.com, and thought I would share them with you (view other videos by the same uploader).

Remember that pressure drag is the #1 cause of...
Forum: Aerodynamics 01-11-2013, 12:22 AM
Replies: 36
Views: 12,076
Posted By ChazInMT
I only state things that I've heard from others...

I only state things that I've heard from others who know way more than me. Think that you have laminar flow over your car body all you want, facts are still that the flow is not laminar, unless...
Forum: Aerodynamics 01-07-2013, 11:14 PM
Replies: 50
Views: 9,333
Posted By ryannoe
Just for you guys. ...

Just for you guys.

http://www.youtube.com/watch?v=Rr__1BmaFN0&feature=youtu.be

-Ryan
Forum: Aerodynamics 01-07-2013, 10:00 PM
Replies: 36
Views: 12,076
Posted By ryannoe
I don't doubt your observations and I'm mulling...

I don't doubt your observations and I'm mulling over why I think you're experiencing the negative MPG.

However, I think you have turbulent and laminar flow flip-flopped. Laminar flow will...
Forum: Aerodynamics 12-31-2012, 10:17 PM
Replies: 50
Views: 9,333
Posted By ryannoe
Happy New Year! I completed testing on a...

Happy New Year!

I completed testing on a 2010 Civic for comparison to the 2012 Prius.

The airflow acted completely differently.

I know the camera angles are not ideal for a good comparison...
Forum: Aerodynamics 12-30-2012, 10:58 PM
Replies: 50
Views: 9,333
Posted By ryannoe
Got a little work done today and the results may...

Got a little work done today and the results may be shocking!

The flow on the back of the Prius is NOT attached.

My partner and I have the frontal and bottom of the vehicle left to tuft, but...
Forum: Aerodynamics 12-27-2012, 06:01 PM
Replies: 50
Views: 9,333
Posted By ryannoe
Tuft Testing Prius Part 1

Ok... ok... so I didn't get the rear of the car tufted.

My helper had a wedding to go to and we thought we'd have more time to get it done.

But we did get the upper side of the car completed....
Forum: EcoModding Central 12-27-2012, 11:27 AM
Replies: 16
Views: 2,963
Posted By straight5
Change the belt. Timing belts aren't like the...

Change the belt. Timing belts aren't like the other belts. In most cases, they don't "look bad" even when they're about to break.
Forum: General Efficiency Discussion 11-30-2012, 02:02 PM
Replies: 27
Views: 7,221
Posted By serialk11r
Valvetronic, Valvematic, and VVEL are capable of...

Valvetronic, Valvematic, and VVEL are capable of 100% throttle independent output control. The throttle is backup only. They can cut duration to under 20% maximum duration, which is enough to idle....
Forum: EcoModding Central 11-25-2012, 09:42 AM
Replies: 20
Views: 5,721
Posted By Diesel_Dave
Rolling Resistance Data for >1,000 tires

Forgive me if someone already posted this, but I came across the motherload of tire rolling resistance data. This .pdf, put out by the Rubber Manufacturers Association in 2009 has rolling resistance...
Forum: General Efficiency Discussion 11-24-2012, 10:48 PM
Replies: 16
Views: 9,505
Posted By bikin' Ed
Rubber valve stem

Another thing for all of us to remember is that rubber valve stems were really not designed for anything over 40 psi. Anthing in the range that you mention should be a brass stem.

Passenger car...
Forum: Hypermiling / EcoDriver's Ed 10-08-2012, 05:18 PM
Replies: 103
Views: 29,309
Posted By redneck
Well... If that ain't accurate enough for...

Well...

If that ain't accurate enough for you then how about...

One Mississippi.

Two Mississippi.

Three ........
Forum: Aerodynamics 10-02-2012, 09:33 AM
Replies: 22
Views: 9,820
Posted By MetroMPG
Tuft testing video: Honda Insight (2000) front wheel well design

http://forkenswift.com/album/24-shopped-profile-grass-med.jpg

I've always been intrigued by the effort Honda put into the bodywork around the front wheel well of the 1st generation Honda Insight....
Forum: Aerodynamics 09-11-2012, 08:31 PM
Replies: 28
Views: 6,331
Posted By Diesel_Dave
It's all speed dependent. I found these graphs...

It's all speed dependent. I found these graphs from a Cummins white paper. It's geared towards semi trucks, but it illustrates the principle.

Here's the first plot. It shows where the power...
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