07-02-2016, 08:49 AM
|
#21 (permalink)
|
Master EcoModder
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907
Thanks: 3,475
Thanked 2,950 Times in 1,844 Posts
|
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
07-02-2016, 10:35 AM
|
#22 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,698
Thanks: 7,776
Thanked 8,585 Times in 7,069 Posts
|
That might make a good three passenger vehicle.
There are rumors/stories about putting two passengers in the back of a Messerscmitt KR-200. It made them really tippy.
Think of the plan taper with a centered rear seat, and the rear ingress/egress problem is cut in half.
|
|
|
07-02-2016, 02:32 PM
|
#23 (permalink)
|
Master EcoModder
Join Date: Jul 2011
Location: Ann Arbor, Michigan
Posts: 4,158
Thanks: 120
Thanked 2,790 Times in 1,959 Posts
|
Quote:
Originally Posted by NeilBlanchard
From his Facebook account:
|
Nice find.
Earlier I did a Google image search using his user name but didn't find anything useful.
Certainly not what I was expecting.
I agree with Freebeard, ( 3-seater comment) but suggest one further step. Put the batteries up front for even better weight distribution.
I think I read a while back weight distribution should be in the range 70/30 to 66/34 front/back with the two wheels up front configuration (trike). Or in other words, each wheel bearing a near equal amount of weight.
The design as presented when fully loaded is too tail heavy.
|
|
|
07-02-2016, 04:51 PM
|
#24 (permalink)
|
Not Doug
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 12,186
Thanks: 7,225
Thanked 2,217 Times in 1,708 Posts
|
Oh. A canopy.
Do the headlights look like they are different heights?
|
|
|
07-06-2016, 06:09 PM
|
#25 (permalink)
|
Master EcoModder
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,895
Thanks: 23,972
Thanked 7,223 Times in 4,650 Posts
|
gently
Quote:
Originally Posted by mikesheiman
Ok, so it tapers in too quickly...would it actually be better off as a hatchback e.g. no taper at all? I know even some hatchbacks get about 0.3 CD.
And I think I see what you mean about the sides. As in they push air up, only to curve into an area where it's quickly pulled down a bit, thus causing a vacuum/turbulence area? How much CD would you guess that issue alone costs and what's a good way to fix it (simply keep sloping upward and very gently start curving downward to meet the very side/tail area)?
|
Yes,the initial inward curvature must be very gentle to protect the boundary layer.
This SMART Car is very good
For lower drag,just add length,while respecting the gentle slope
If you envisioned the car as an upright wing,you'd use the 3.92:1 section (between #4 and #5)
As a 3D flow body you'd opt for the minimum drag half body based on the 2.5:1 teardrop.
The curvatures of these shapes would be your guide as far as slopes go.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
|
|
|
10-10-2017, 12:30 PM
|
#26 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,698
Thanks: 7,776
Thanked 8,585 Times in 7,069 Posts
|
What's with all the Photobucket placeholders?
|
|
|
10-10-2017, 12:45 PM
|
#27 (permalink)
|
Master EcoModder
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907
Thanks: 3,475
Thanked 2,950 Times in 1,844 Posts
|
Photobucket now charges, so old links are broken.
|
|
|
10-10-2017, 05:19 PM
|
#28 (permalink)
|
Master EcoModder
Join Date: Aug 2012
Location: northwest of normal
Posts: 27,698
Thanks: 7,776
Thanked 8,585 Times in 7,069 Posts
|
I didn't realize they are old re-posts.
Quote:
Originally Posted by NeilBlanchard
From his Facebook account:
....
|
These don't even display placeholders in my web browser, Palemoon with Noscript. I like that part.
|
|
|
10-14-2017, 12:28 PM
|
#29 (permalink)
|
Master EcoModder
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,895
Thanks: 23,972
Thanked 7,223 Times in 4,650 Posts
|
design
Without either a full set of 5-view scale drawings,or telephoto pictures from a great distance I'm useless to you.
There is a way to estimate the total drag of a structure by analyzing each constituent component,allowing for interference at all intersections which is offered by Hoerner,in his book,Aerodynamic Drag.
We've got to have scale images to work with though.
Each component can be optimized based upon extant,published, empirical test results.
Front,Rear,Top,Side,and Bottom views are mandatory.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
|
|
|
|