12-21-2020, 04:08 PM
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#1 (permalink)
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External air curtains
Throttle stop drag tested, tuft tested and pressure tested. The most effective 'simple' modification for measured drag reduction that I have done.
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12-21-2020, 04:47 PM
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#2 (permalink)
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The best candidate I've seen, from Ecomodding Central. I suggested he search on 'edgarwit':
https://ecomodder.com/forum/showthre...eas-38904.html
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12-21-2020, 07:04 PM
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#3 (permalink)
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Quote:
Originally Posted by JulianEdgar
The most effective 'simple' modification for measured drag reduction that I have done.
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Awesome.
I appreciate you trying new things and testing them rather than dismissing them as something only large corporations with vast resources and staff of professionals can do.
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You cannot sell aerodynamics in a can............
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12-22-2020, 05:54 AM
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#4 (permalink)
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Quote:
Originally Posted by JulianEdgar
Throttle stop drag tested, tuft tested and pressure tested. The most effective 'simple' modification for measured drag reduction that I have done.
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And why does it look so ugly? The modifications must be applied in such a way as to be related to the current design of the car. It's like they're taken from the truck ...
I would have chosen the solution inspired by Mercedes-Benz A-Class/C-Class. |
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12-22-2020, 06:12 AM
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#5 (permalink)
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Quote:
Originally Posted by IRONICK
And why does it look so ugly? The modifications must be applied in such a way as to be related to the current design of the car. It's like they're taken from the truck ...
I would have chosen the solution inspired by Mercedes-Benz A-Class/C-Class.
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Well when you do so, you can show us the results. |
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12-22-2020, 01:05 PM
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#6 (permalink)
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Quote:
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And why does it look so ugly? ... It's like they're taken from the truck ...
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That's a section of aluminum extrusion. I consider it proof of concept.
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12-22-2020, 05:09 PM
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#7 (permalink)
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It is totally useless in this case. An aluminum (or any other material) sheet does the same thing.
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12-22-2020, 05:16 PM
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#8 (permalink)
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Quote:
Originally Posted by IRONICK
It is totally useless in this case. An aluminum (or any other material) sheet does the same thing.
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You'll have to show us the results of your testing - this is an interesting area.
Vman455 told me he used sheet metal for external front air curtains and recorded a drag increase on his Prius - but they gave much better stability when passing trucks.
As I say, I'd love to see the results of your tests. |
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12-22-2020, 05:39 PM
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#9 (permalink)
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Quote:
Originally Posted by JulianEdgar
Vman455 told me he used sheet metal for external front air curtains and recorded a drag increase on his Prius - but they gave much better stability when passing trucks.
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Yes, this is correct--the sheet metal front ducts by themselves appear to increase drag based on fuel economy testing. But when I compared pressure difference on each side of the car just behind the front wheel arches (at Julian's suggestion--thanks!), I found that the average pressure difference between sides in a 25 mph crosswind was nearly 15% lower with the ducts on. The wing sections seem to be a better solution, and something I'll probably try in the future. |
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12-22-2020, 06:08 PM
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#10 (permalink)
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Can you post a comparison of the two approaches?
I speculate that a flat plate would have critical angle-of-attack and positioning criteria. I further speculate that a curved plate would approach the result of the airfoil section.
I've been thinking about air curtains on a Geo Metro. It looks like I could add a partial diverter on each side (flushed out to the upper bumper) with curved plates capping the void created.
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