06-04-2013, 04:08 PM
|
#181 (permalink)
|
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,534
Thanks: 4,082
Thanked 6,979 Times in 3,614 Posts
|
I dunno. Call me a conservative old fuddy duddy, but since I'm not an expert, I look to the experts to show me what to do.
And I can't find any examples of super-high efficiency, low Cd vehicles with ricer-scale, befinned diffusers on them!
EDIT: wait a sec ... Fog of memory is parting... I think someone's going to post a pic of a solar car that has 'em.
|
|
|
|
 Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
06-04-2013, 04:14 PM
|
#182 (permalink)
|
|
(:
Join Date: Jan 2008
Location: up north
Posts: 12,762
Thanks: 1,585
Thanked 3,555 Times in 2,218 Posts
|
It looks like a sphincter blowout to me.
|
|
|
|
|
06-04-2013, 05:42 PM
|
#183 (permalink)
|
|
Master EcoWalker
Join Date: Dec 2012
Location: Nieuwegein, the Netherlands
Posts: 4,000
Thanks: 1,714
Thanked 2,247 Times in 1,455 Posts
|
Quote:
Originally Posted by MetroMPG
I'm going to have to start the Canadian division: but "L/100km Militia" doesn't have the same ring to it, eh?  |
What about milliliter/kilometer militia or cc/km militia for shorthand?
Cheers, Bart (40 CC/KM @ last fill)
__________________
2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
|
|
|
|
|
06-04-2013, 06:37 PM
|
#184 (permalink)
|
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,740
Thanks: 8,158
Thanked 8,940 Times in 7,382 Posts
|
jime57 -- I had one design, pace Colani, that had two fences on the outside, spring-loaded and with skateboard wheels in the tips.
Lately, I lean toward titanium skids.
|
|
|
|
|
06-04-2013, 07:45 PM
|
#185 (permalink)
|
|
also races Sportbikes!!!
Join Date: Aug 2012
Location: Bay Area, California
Posts: 88
Thanks: 11
Thanked 4 Times in 4 Posts
|
wow 108mpg w/ aero mods and w/o MIMA - very impressive, sir!
__________________
2000 Honda Civic HX with mild aero mods 
2006 Honda Insight MIMA, FAS, no passenger sideview mirror, race style drivers mirror, front and rear underbody aero, temporary front air dam
|
|
|
|
|
06-04-2013, 07:55 PM
|
#186 (permalink)
|
|
Master EcoModder
Join Date: Oct 2008
Location: Mid-Atlantic
Posts: 491
Thanks: 170
Thanked 69 Times in 44 Posts
|
Quote:
Originally Posted by MetroMPG
I dunno. Call me a conservative old fuddy duddy, but since I'm not an expert, I look to the experts to show me what to do.
And I can't find any examples of super-high efficiency, low Cd vehicles with ricer-scale, befinned diffusers on them!
EDIT: wait a sec ... Fog of memory is parting... I think someone's going to post a pic of a solar car that has 'em.
|
I tend to agree with you overall observations. I was just kicking the idea around.
Formula 1 cars have been productively using various diffuser fins for several years now, but I'm not sure that the 150-175 MPH difference in speed makes that comparison relevant.
And, yes I remember seeing that solar car. As I recall, the fins were small and at the very rear. |
|
|
|
|
06-04-2013, 08:30 PM
|
#187 (permalink)
|
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,740
Thanks: 8,158
Thanked 8,940 Times in 7,382 Posts
|
Quote:
|
Originally Posted by MetroMPG
And I can't find any examples of super-high efficiency, low Cd vehicles with ricer-scale, befinned diffusers on them!
|
Yet...
My point would be that boattails have ricer-scale plates (w/ plan taper) without the fences, so why not add them? It looks like the fences fan out to pull air out into the wake of the rear tires.
...oh, and
Quote:
|
a conservative old fuddy duddy
|
'splain the boattail.
Last edited by freebeard; 06-04-2013 at 08:37 PM..
|
|
|
|
|
06-04-2013, 08:41 PM
|
#188 (permalink)
|
|
Not Doug
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 12,241
Thanks: 7,254
Thanked 2,234 Times in 1,724 Posts
|
|
|
|
|
|
06-07-2013, 02:50 PM
|
#189 (permalink)
|
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,534
Thanks: 4,082
Thanked 6,979 Times in 3,614 Posts
|
Quote:
Originally Posted by freebeard
My point would be that boattails have ricer-scale plates (w/ plan taper) without the fences, so why not add them?
|
Oh - when I saw that Lotus pic, the thing that I was (unclearly) reacting to was the plethora of fins/strakes. The outside "fences" (a.k.a. rear wheel boat tailing) definitely make sense, and there's lots of precedence for those on high-efficiency cars & prototypes.
I bet adding those would probably help the U.F.O.'s aero, and if doing so means the underside of the tail then technically becomes a diffuser (if un-befinned), so be it! |
|
|
|
|
06-07-2013, 07:39 PM
|
#190 (permalink)
|
|
Master EcoModder
Join Date: Jul 2010
Location: Belgium
Posts: 4,683
Thanks: 178
Thanked 652 Times in 516 Posts
|
Quote:
Originally Posted by MetroMPG
EDIT: wait a sec ... Fog of memory is parting... I think someone's going to post a pic of a solar car that has 'em.
|
The Loremo has a bit of a diffuser
http://ecomodder.com/forum/showthrea...ion-14519.html
__________________
Strayed to the Dark Diesel Side
|
|
|
|
|
