RazMan
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| posted on 18/5/07 at 11:10 PM |
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quote:
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Originally posted by MikeR
i think just a flat black carbon look-a-like sheet would do the business.
My concerns would be it becoming a water and stone trap. Perhaps leave a 1" gap between it and the lowest chassis rail it meets. Should allow the
rubbish to drop out.
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A very good point - you should see how much gravel I've collected in the front section I'll put in a couple of exit slots to let everything
drain out.
quote:
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Originally posted by jonno
How about bring the grp lower on the wheel ? or is that too much work ?. I'm going to put some lower 'fins' on my rear as well
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I am actually thinking on similar lines - I have noticed a lot of spray when driving on wet roads, so a kind of spat (as in your pic) built in would
be nice. See pic below
quote:
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Originally posted by ruskino80
like it a lot-but why not paint all the visible metal black so your eye is not drawn to it so much?
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Now that's just cheating  I chose powder coated silver for the chassis so painting over it would not be much fun.
Here's my latest offering which has slightly lower fins , is wider and with more 'spat'. I've also removed part of the centre
spar
Jeeez how am I going to make this?  
[Edited on 18-5-07 by RazMan]
 
Rescued attachment Aeon diffuser idea2.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MikeRJ
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| posted on 19/5/07 at 11:04 AM |
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That makes the back look so much more 'finished', you should definitely do this.
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worX
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| posted on 19/5/07 at 11:32 AM |
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Raz,
this is the book that was been lent by a racer friend of mine, as I intend to build a diffuser for mine (when I recover some money from actually
building it!)
If you are interested in some of the changes that it would suggest you make from both of your after pictures, then please U2U me and I will describe
in as much detail as I remember those changes !
cheers,
Steve
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RazMan
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| posted on 21/5/07 at 04:51 PM |
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I have now done a scale drawing of my diffuser - quite a simple thing really.
Have I made any howlers?
The smaller end ribs are more for strength tyhan anything else.
[Edited on 21-5-07 by RazMan]
 
Rescued attachment diffuser drawing.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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worX
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| posted on 21/5/07 at 05:05 PM |
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the end view and the bottom view don't correlate - from the end view the fins (outermost) look like they run perpendicular (?) to the car ie
down the length of the car (this is how I would have it). but the bottom view would suggest that they are running at an angle (fine-ish) but in a
straight line rather than curving outward (preferred) to maximise disruption in airflow After the car...
don't mean to offend - I am trying to recall the info I gleamed from the books I've read recently as accurately as I can!!
Steve
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RazMan
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| posted on 21/5/07 at 05:13 PM |
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Oops! You spotted my deliberate mistake
I have also added the mesh panel for clarity - it is going to be fixed to avoid hinging problems.
 
Rescued attachment diffuser drawing.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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worX
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| posted on 21/5/07 at 05:27 PM |
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Hi again Raz!
In spite of your "delberate mistake" - I still maintain that the Much More efficient layout of the fins would be to probably have 6
in total.
inner two: would be doing the channelling of the airflow, which starts at the front of the car, through to the slope of the diffuser, and therefore
creating the most efficient tunnelling effect.
next two: would be curved outward to make the most of whats sometimes called dirty air - a forced creation of vortices making inefficient air AFTER
the wake of the car therefore increasing the downforce by increasing the speed of the air underneath the car AND the upward rush of the air at the
back.
outer two: would be specifically acting as "Skirts" like a Formula 1 car. This prevents the ingress of dirty air from the side of the car
entering and disrupting all the good/efficient work that your flat bottomed floor and diffuser are actually doing.
The creation and efficient working of the outer two would require a change in shape of your design. Compare the shape of yours - a fan shape (sort
of) and the shape of that Westfield "plywood " special that you emailed me earlier - a rectangle shape.
hope this makes sense!!!
Steve
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gttman
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| posted on 22/5/07 at 03:15 AM |
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hmmm I think you are on the right lines but it is drawing my eye to the grill below the number plate, and it sort of looks like the new Audi front ie
that its got a beard.
definatelly on the right lines though, have you tried the colour change to black to see the impact?
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RazMan
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| posted on 22/5/07 at 08:18 AM |
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Now that you mention it, I can see what you mean about the beard I have made a couple of mods to the grille which allows me to simplify the exhaust
(for when I fit the turbo) I first tried it with a single large bore exhaust but swmbo said it looked like a cat's bum so I went with the twin
tailpipe!
I can't really change the grille colour at this stage as it would contradict the rest of the (very expensive) stainless mesh elswhere on the car
quote:
Originally posted by gttman
hmmm I think you are on the right lines but it is drawing my eye to the grill below the number plate, and it sort of looks like the new Audi front ie
that its got a beard.
definatelly on the right lines though, have you tried the colour change to black to see the impact?
[Edited on 22-5-07 by RazMan]
 
Rescued attachment Aeon diffuser idea3.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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RazMan
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| posted on 22/5/07 at 10:16 AM |
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quote:
Originally posted by worX
In spite of your "delberate mistake" - I still maintain that the Much More efficient layout of the fins would be to probably have 6
in total.
inner two: would be doing the channelling of the airflow, which starts at the front of the car, through to the slope of the diffuser, and therefore
creating the most efficient tunnelling effect.
next two: would be curved outward to make the most of whats sometimes called dirty air - a forced creation of vortices making inefficient air AFTER
the wake of the car therefore increasing the downforce by increasing the speed of the air underneath the car AND the upward rush of the air at the
back.
outer two: would be specifically acting as "Skirts" like a Formula 1 car. This prevents the ingress of dirty air from the side of the car
entering and disrupting all the good/efficient work that your flat bottomed floor and diffuser are actually doing.
The creation and efficient working of the outer two would require a change in shape of your design. Compare the shape of yours - a fan shape (sort
of) and the shape of that Westfield "plywood " special that you emailed me earlier - a rectangle shape.
hope this makes sense!!!
Steve
It all makes perfect sense but I am quite limited by space and fabbing skills. Making curved alloy fins will be quite a mission for me and I am not
really that concerned about the extra ground effect that this diffuser will give the car. As I said in my original post, it is primarily a road car
and I wanted to make this partly cosmetic with a nod to functionality. 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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DarrenW
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| posted on 22/5/07 at 10:30 AM |
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Yes yes yes.... go for it. All o fthe ideas look great. Love the mesh and the twin tail pipes. Certainly finishes of an already superb car very well
indeed.
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MikeRJ
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| posted on 22/5/07 at 02:40 PM |
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How about painting the mesh body colour? That way it won't clash with the stainless mesh and removes the beard? I photoshopped the wrong
image, but you get the idea:
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flak monkey
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| posted on 22/5/07 at 02:44 PM |
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Looks miles better with silver mesh IMO.
Car design by committee, don't you love it?
Sera
http://www.motosera.com
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Tralfaz
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| posted on 22/5/07 at 08:34 PM |
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quote:
Originally posted by flak monkey
Looks miles better with silver mesh IMO.
Agreed.
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gttman
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| posted on 22/5/07 at 10:01 PM |
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quote:
Originally posted by Tralfaz
quote:
Originally posted by flak monkey
Looks miles better with silver mesh IMO.
Agreed.
Andygtt
Please redefine your limits
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gttman
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| posted on 22/5/07 at 10:01 PM |
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quote:
Originally posted by Tralfaz
quote:
Originally posted by flak monkey
Looks miles better with silver mesh IMO.
Agreed.
I also agree..... what I was meaning is colour change the difuser.
Your last one looks much better, the beard is gone... but I would still like to see what the difuser looks like black.
[Edited on 22/5/07 by gttman]
Andygtt
Please redefine your limits
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RazMan
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| posted on 22/5/07 at 10:32 PM |
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quote:
Originally posted by gttman
... but I would still like to see what the difuser looks like black.
Unfortunately I can't get the detail very visible in black
 
Rescued attachment Aeon diffuser idea4.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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gttman
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| posted on 23/5/07 at 12:33 PM |
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I like that, I'd make it and paint it black.... if it doesn't look right you can always colour code it later...
Andygtt
Please redefine your limits
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RazMan
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| posted on 30/5/07 at 09:35 PM |
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Ok then, I have now made a very rough prototype from plywood (a la Westfield )
 
Rescued attachment Diffuser Prototype 1.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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RazMan
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| posted on 30/5/07 at 09:36 PM |
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And another view...
I have already decided that the radius on the rear edge of the fins needs to be increased as it looks too square.
What do you think guys?
[Edited on 30-5-07 by RazMan]
 
Rescued attachment Diffuser Prototype 4.jpg
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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David Jenkins
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| posted on 31/5/07 at 08:00 AM |
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That looks great... slap a bit of Hammerite on it and it'll be just fine! 
Seriously though, it's a good shape.
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chriscook
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| posted on 31/5/07 at 08:15 AM |
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Can you make the change in angle between the sections any less? I think this would make it more effective aerodynamically from what I remember.
I know your main reasons are aesthetic but if you can make it work at the same time then why not?
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RazMan
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| posted on 31/5/07 at 08:57 AM |
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quote:
Originally posted by chriscook
Can you make the change in angle between the sections any less? I think this would make it more effective aerodynamically from what I remember.
I know your main reasons are aesthetic but if you can make it work at the same time then why not?
I'm not sure I know what you mean Chris - The angle of the fins?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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chriscook
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| posted on 31/5/07 at 03:57 PM |
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The angle the 'horizontal' bits make to the floor - ie make it smoother and less staircase like
does that make sense?
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Fred W B
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| posted on 31/5/07 at 06:14 PM |
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Maybe it needs to be a bit more aggressive, like this - From the GD website
Cheers
Fred WB
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