phelpsa
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| posted on 6/3/13 at 10:21 AM |
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Aries Locost Diffuser
Finally got round to starting my diffuser/rear undertray. Here's a few pics of the progress so far.
 
Description
 
Description
Ramp angles are pretty sensible but the wishbones limit how far back I can take them. It will be mounted with proper fixings not gaffer tape...
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designer
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| posted on 6/3/13 at 10:46 AM |
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You should have a smooth contour rather than a bend where the floor meets the diffuser. They should blend together to get any effect.
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phelpsa
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| posted on 6/3/13 at 11:28 AM |
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quote:
Originally posted by designer
You should have a smooth contour rather than a bend where the floor meets the diffuser. They should blend together to get any effect.
Thanks for the advice, but thats not generally the case.
[Edited on 6-3-13 by phelpsa]
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designer
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| posted on 6/3/13 at 01:06 PM |
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quote:
thats not generally the case.
I think it is! There must to be a smooth undisturbed flow of air. Any ledge/crease/too sharp a change spoils it.
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phelpsa
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| posted on 6/3/13 at 01:13 PM |
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quote:
Originally posted by designer
quote:
thats not generally the case.
I think it is! There must to be a smooth undisturbed flow of air. Any ledge/crease/too sharp a change spoils it.
I don't want to start a discussion on diffuser design, that wasn't the purpose of this thread, but I think you need to look into it a bit
further.
I shall leave this photo of a highly developed diffuser as inspiration for your research 
[Edited on 6-3-13 by phelpsa]
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designer
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| posted on 6/3/13 at 02:20 PM |
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You can't compare a CART diffuser with our sort of car! That diffuser is concave and works a totally different way!
[img]
 
[/img]
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phelpsa
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| posted on 6/3/13 at 02:28 PM |
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quote:
Originally posted by designer
You can't compare a CART diffuser with our sort of car! That diffuser is concave and works a totally different way!
[img]
[/img]
You can quite clearly she the sharp kick up at the base of the diffuser in that design as well. It sounds like we'll have to agree to
disagree.
FYI the rads on my are 30mm.
[Edited on 6-3-13 by phelpsa]
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scutter
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| posted on 6/3/13 at 03:47 PM |
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Looks good fella, just a point of interest. Knowing what you do for a living, do you see any issues with the airflow reattaching to the rear panel as
the diffuser end inline with it? is the space between the 2 enough to prevent this.
Catch up soon, Dan.
The less I worked, the more i liked it.
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BangedupTiger
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| posted on 6/3/13 at 05:06 PM |
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Looks top notch.
I can assure you a bend is not a poor design, mine has a bend and was designed by a guy who knows his stuff.
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phelpsa
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| posted on 6/3/13 at 07:16 PM |
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quote:
Originally posted by scutter
Looks good fella, just a point of interest. Knowing what you do for a living, do you see any issues with the airflow reattaching to the rear panel as
the diffuser end inline with it? is the space between the 2 enough to prevent this.
Catch up soon, Dan.
Dan, it had crossed my mind, but the regulations won't allow anything to protrude past the rear of the car. I'm not convinced that it
could ever occur as the angle of the rear of the car is so steep (around 15 degrees from vertical), but I have a recipe for home made flow vis so I
could test it out! As you pointed out, the gap may help, but I couldn't say for definite.
P.S. I'm back as a lowly student now, but will be back in the oxford area for the summer.
[Edited on 6-3-13 by phelpsa]
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umgrybab
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| posted on 6/3/13 at 08:09 PM |
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Some people just wind me up. They have an opinion and run with it, cause some guy somewhere who said he was something, did it. They don't
actually have any factual knowledge on the subject themselves or the full story of why a design has bad features because of constraints. And its
everywhere, not just this thread. Designer is right, any sharp bend in airflow is bad. And if 30 mm is not a sharp bend for air, the relative velocity
must be around 9 mph. If you don't agree, go educate yourself. Although if you look at the amount gained vs. the added weight, you may as well
have just put a flat plastic plate under the boot.
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phelpsa
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| posted on 6/3/13 at 08:15 PM |
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quote:
Originally posted by umgrybab
Some people just wind me up. They have an opinion and run with it, cause some guy somewhere who said he was something, did it. They don't
actually have any factual knowledge on the subject themselves or the full story of why a design has bad features because of constraints. And its
everywhere, not just this thread. Designer is right, any sharp bend in airflow is bad. And if 30 mm is not a sharp bend for air, the relative velocity
must be around 9 mph. If you don't agree, go educate yourself. Although if you look at the amount gained vs. the added weight, you may as well
have just put a flat plastic plate under the boot.
What was the purpose of this comment?
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BangedupTiger
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| posted on 6/3/13 at 11:23 PM |
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quote:
Originally posted by umgrybab
Some people just wind me up. They have an opinion and run with it, cause some guy somewhere who said he was something, did it. They don't
actually have any factual knowledge on the subject themselves or the full story of why a design has bad features because of constraints. And its
everywhere, not just this thread. Designer is right, any sharp bend in airflow is bad. And if 30 mm is not a sharp bend for air, the relative velocity
must be around 9 mph. If you don't agree, go educate yourself. Although if you look at the amount gained vs. the added weight, you may as well
have just put a flat plastic plate under the boot.
As I've already said, the guy knows what he is talking about. He manages to get astronauts in space sucessfuly so i'm quite sure this
isnt beyond his capabilities.
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smitht82
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| posted on 7/3/13 at 02:33 PM |
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Any rear diffuser would surely stop the parachute effect though, so would be beneficial i assume.
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