grill "shield" rather than block?

[TestDrive]

Originally Posted by aerohead

TestDrive,thanks for the input.I saw your post last session but store was about to close and couldn't respond.------- The computer that I use is in town and I pay by the hour for it's use.------- It runs Windows XP and the internet interface is through Mozilla Firefox.-------- The thing about the dashed lines,is that I'm not using any kind of word processing program for the text and there is no way to set tabs or do indents to signal a new paragraph.Pretty primitive!----------------- When Al Glidewell helps me send images with emails,he'll go through dozens of key strokes and dozens of windows before it's all done.He just leaves me behind in the dust.---------- Free time is none existent and I feel that if I juggle time to learn word processing and graphics,I'll never have time for the internet.---------- Once I get here to the copy center,it's kinda balls-to-the-wall until the clock runs out.Any help will be greatly appreciated.I have digital camera, and also scanning capability here,and so far have relied on Al do do all the image transfers.Thanks again,Phil.

Phil, first make sure you're logged on to the forum.
If you are, you User Name should appear on the right half of the page header.

Next, lets check your Edit Options
At the bottom of the Edit Options page you'll find -

If you're posting the occasional picture and/or attachment, you'll want/need to choose either Standard Editor or Enhanced Interface. I suggest you try the Enhanced Interface first as it is WYSIWYG (What you see, is what you get), while the Standard Editor shows you some of the underlying code (great if you're a computer geek, otherwise not so great).

Any of the three possible editor interfaces is still pretty primative - no tab stops or paragraph indents, but as an alternative to strings of dashes you might try pressing the enter key twice.
The first press forces the start of a new line.
The second press puts a blank line between paragraphs.

Given the situation with the pay by the hour copy center, it's probably not worth trying to rectify the photobucket situation other than you might ask Al Glidewell if Firefox, Flash and Java have all been updated to the latest versions. If any is not and he later updates it/them, you might give photobucket another try.

As a final note. If you start writing in the Quick Replay box at the bottom of the page and decide part way through that you wish you had all of the controls - like when you use the Quote button or start a new thread - just click the Go Advanced button. What you've already written will be carried along to the new page which includes the missing controls.

Hope this helps.

[lunarhighway]

after some experimentation installing something as described above on my top grill proved difficult so i abandoned the idea for a while, however yesterday while playing around with some plastic dams i'd made for a different project i found they fitted rather nice in front of the lower air intake


the lower grill opening is much smaller than the visual "grill". In fact i think the whole thing is more designed like a splitter than a grill (a horisontal surface that provides a little downforce at the front)

the actual opening is about the width of the licence plate recess and is only above the body colored bar... pretty small to begin with and every time i tried something remotely close to a full grillblock 1 or 2 days later i got into a situation where the car got much hotter than i liked.



this block doesn't alter the surface area of the grill but it does alter the orientation of the hole... so is slow moving traffic where the overheating might become a problem (fan asisted)airflow should be the same, however i hope that the plated deflect some air over the grill and under the car.

accuarte fe testing is always the weak spot of my mods so i have to rely on the but o meter and coastdown test to see if there's any difference, but thus far i'm not picking up bad vides... tempertaturs where low this morning, but the engine temp stayed surprising low as well so cooling should be fine

[aerohead]

The only thing I've seen which remotely conforms to your query is Ford of Cologne's "lameller" grille,developed for their Capri.It is an otherwise "wide-open" grille constructed of airfoil elements which are designed to stall during high-speed driving,with the stalled,turbulent flow impeding incoming air,effectively "blocking" the grille until velocity falls to "urban" levels.We kicked this one around a year or so ago.

[lunarhighway]

i know,but i thought this belonged here rather then build another thread on the same subject. also this is the first practical application i make wich attemps this effect.
in your oppinion, is what i've show above completely useless or could this block some airflow trough the grill at speed?

for reference, here's a picture with my actual open grill area highlighted:

[majestic]

Don't forget this car, the original Cadillac CTS. I've always been intrigued by the grille setup, as it does atleast look good for aero. 4 of the 8 sections in the lower bumper are also blocked off.

At .31 it is not great, but I think some compromises were definitely made due to the expressive styling.

[donee]

Hi All,

Take a close look at the recent model Camry grill. It has airfoil sections that are tilted. The airfoils are like an aircraft wing when an airplane is upside down. So, it appears they have designed it to retard flow when the flow over the thickest portion of the cord developes seperated flow.

[JPTrucker]

Why not just use a solid piece of material (cardboard for starters) and then just put say 1" holes in it, evenly spaced. The idea being that at low speed you still have air coming in but at higher speed the air has to "whirlpool" around like water down a drain. All the air can't get in through the hole at the same time and that could be your airflow limiter.

What made me think of it was watching the PBS show about how apparently all galaxies have a black hole in their center. When a large amount of matter tries to get into the "event horizon" - that is to say enter the hole, that matter starts whirlpooling around since it can't all enter at once.

If 1" holes are too big or small then try smaller or larger or space the holes closer together. Surely would be easier to fabricate.

[chuckm]

The air won't whirlpool. This website shows some very simple sketches of flow through an orifice.
I'm not sure that the event horizon has much to do with galactic rotation. Eliptical galaxies also have supermassive black holes yet can be spherical.

[aerohead]

Originally Posted by lunarhighway

i know,but i thought this belonged here rather then build another thread on the same subject. also this is the first practical application i make wich attemps this effect.
in your oppinion, is what i've show above completely useless or could this block some airflow trough the grill at speed?

for reference, here's a picture with my actual open grill area highlighted:

lunarhighway,sorry!,I lost track of where we had all been with grille tech and previous posts.--------------- Looking at your photo,it's likely that what you show will cause a restriction.Coolant temp may be the only variable we could monitor,short of access to
a windtunnel.It looks as though Opel has already minimized the grille opening.If the entry is not air-tight and is allowing air to bleed around the radiator,then with an air-tight arrangement,according to Korff,you could get away with an opening 1/6 the height of the radiator,if it is the full width of the radiator and the duct as deep as one radiator height..That would be your absolute minimum for a fixed opening.Compare that to where you're beginning from and proceed to choke it off with the stalling vanes.I would mimic Ford's design as it represents good science.--------- I don't know if it is possible to tuft the vanes and photo-capture their behavior with a close-range video camera and flood-lighting during multi-velocity operation but you would almost need to do something like that to "witness" what is happening.Without a wind tunnel we've got to be creative.

[JPTrucker]

chuckm,
Isn't that website about fluids? I have no idea if air will work the same way.

If the air won't whirlpool, won't it at least restrict it as desired, with the proper size holes?