03-31-2012, 07:35 PM
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#11 (permalink)
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Ultimate Fail
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Hey Euro, I like your thinking !
Clever idea using a bike rack disguise !
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Today
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Other popular topics in this forum...
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03-31-2012, 07:44 PM
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#12 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by Cd
Hey Euro, I like your thinking !
Clever idea using a bike rack disguise !
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Me too.
Quote:
Originally Posted by Cd
( Actually, to be fair it should be mentioned that Paulu made note of the studies posted here on page 2 of the original thread - but its good to have a dedicated thread on this. )
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I did note it, and linked to his post, in the OP of this thread. I was unaware of his post at first. When I saw it, I edited this post and also asked the moderators to consider merging the threads, but Metro thought there was enough difference to keep them separate. My OP was mostly interested in expanded detail on the specific drag reductions attained through the box cavity designs. That was not part of what paulu noted.
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04-24-2012, 12:55 PM
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#13 (permalink)
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Master EcoModder
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I've been thinking about this some more. Do you think a sedan owner could create a plexiglass baseplate sticking up vertically from the trunk edge, essentially creating a phantom Kammback? This would be less intrusive than making the trunk unusable but would it give meaningful drag reduction?
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03-19-2013, 11:59 AM
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#14 (permalink)
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Hypermiler
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Quote:
Originally Posted by drmiller100
Research
This article is IMPORTANT. I recommend you save it, read it, and learn it.
This article is saying you can reduce drag 40 percent by making a tail. And the tail does not have to be very long.
And according to them, 20 degrees is about the absolute max, and even at that you are going to have problems with the bottom, but it is still worth it.
This article is worth SAVING.
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Link is broken. Anyone have a copy?
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03-19-2013, 01:12 PM
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#15 (permalink)
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Master EcoModder
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Quote:
Originally Posted by PaleMelanesian
Link is broken. Anyone have a copy?
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Looks like Coventry broke all the links, and I'm not sure how to find any papers anywhere on their site - which is sad, I haven't read them.
It looks like I had some luck searching the web for a few titles though:
http://www2.warwick.ac.uk/fac/sci/wm...baseplates.pdf
http://www2.warwick.ac.uk/fac/sci/wm...simplebody.pdf
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03-19-2013, 08:36 PM
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#16 (permalink)
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Master EcoModder
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Here is one specific to drag on electric vehicles, also covers wheel openings (and more):
http://www2.warwick.ac.uk/fac/sci/wm...tationws12.pdf
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You cannot sell aerodynamics in a can............
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03-19-2013, 10:45 PM
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#17 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by kach22i
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On page 10 their scale model testing shows a tiny benefit for "blanking" the wiper cavity. And their biggest benefit was with the rear diffuser.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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04-04-2013, 02:12 PM
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#18 (permalink)
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Master EcoModder
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Quote:
Originally Posted by kach22i
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Another point I notice in this doc is they used OpenFOAM for CFD - never heard of it, but found it here: The OpenFOAM® Foundation. (I also could have found it just googling 'open source CFD,' though it's nice to know what Universities have chosen for CFD.) OpenFOAM is open source / free, looks easy (for me) to install or build for Linux *not for Windows*... but the learning curve appears very steep. Momentarily I couldn't find an answer to how you import solid objects into the OpenFOAM mesh generator, i.e. from a NURBS or Polygon file format, which is key. But I think I remember some separate open-source projects that stand alone as mesh generators, so I think there is a solution outside the scope of OpenFOAM. (Finally in order to delve into CFD one would have to consider how to setup some correlation between CFD and wind-tunnel data (preferably someone else's published wind-tunnel data), to ensure the computation is configured sensibly. Overall I'm not sure if it's worth the investment of (my) time, but it's always a temptation in the back of my mind... and now I know the name of a viable CFD suite...)
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04-04-2013, 02:34 PM
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#19 (permalink)
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Master EcoModder
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Quote:
Originally Posted by PaleMelanesian
Link is broken. Anyone have a copy?
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You'll find them here, amongst other stuff:
https://www.dropbox.com/sh/52o49bkru...modder_studies
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Strayed to the Dark Diesel Side
Last edited by euromodder; 04-04-2013 at 05:06 PM..
Reason: Modified the link as it didn't work
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04-05-2013, 11:50 AM
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#20 (permalink)
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Hypermiler
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Outstanding! Too bad I can only give you one Thanks for that post.
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