Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-02-2022, 06:50 AM   #1 (permalink)
.
 
Join Date: Dec 2011
Location: Salt Lake valley Utah
Posts: 923
Thanks: 114
Thanked 397 Times in 224 Posts
Think Flight: Using Simple Aerodynamics to Beat High Gas Prices

Published Aug 31st. Delete if a repost.

35.64mpg to 40.52mpg


__________________
I try to be helpful. I'm not an expert.

Last edited by sheepdog 44; 09-02-2022 at 07:04 AM..
  Reply With Quote
The Following 6 Users Say Thank You to sheepdog 44 For This Useful Post:
aerohead (09-08-2022), Cd (09-10-2022), Ecky (09-02-2022), Gasoline Fumes (09-11-2022), ldjessee00 (09-02-2022), pgfpro (05-04-2023)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-02-2022, 12:53 PM   #2 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,670
Thanks: 8,134
Thanked 8,919 Times in 7,362 Posts
I put it in "Interesting Aeordynamic..." but don't delete. It's just lost there.

What can one see from the thumbnail, that he took tuft testing to find out?
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
The Following 2 Users Say Thank You to freebeard For This Useful Post:
aerohead (09-08-2022), ldjessee00 (09-02-2022)
Old 09-08-2022, 11:23 AM   #3 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,298
Thanks: 24,427
Thanked 7,381 Times in 4,779 Posts
what see

Quote:
Originally Posted by freebeard View Post
I put it in "Interesting Aeordynamic..." but don't delete. It's just lost there.

What can one see from the thumbnail, that he took tuft testing to find out?
The preliminary conclusion from the tuft study infers that both the plan-taper and diffuser angle are too extreme to protect the boundary layer from premature separation, counter-flow, eddies, and turbulence.
Also, from other reportings, the addition of rear wheel skirts and a full belly pan with diffuser would have amplified the 13.7% mpg result.
So, anyone wishing to improve on the tail would select smaller angles on the sides and bottom, for the 'second-approximation' design.
When the tufts behave as up top, you're essentially 'there.'
Additionally, if the coefficient of pressure profile were to be determined, this would be 'what you're looking for', by default.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 09-08-2022, 01:20 PM   #4 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,670
Thanks: 8,134
Thanked 8,919 Times in 7,362 Posts
Admitedly the plan taper doesn't show in the thumbnail.

Compare the Breer high-tailed stinger vs Harry Westergard's taildraggers.
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
Old 09-08-2022, 02:08 PM   #5 (permalink)
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,298
Thanks: 24,427
Thanked 7,381 Times in 4,779 Posts
Westergard

They all look too aggressive to me. Pseudo-Jaray 'fastback'. I'd bet a cup a Joe and a sugar-dum-dum that they'd suffer premature separation.
'Like the look though.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote
Old 09-09-2022, 01:09 AM   #6 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,796

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 43.3 mpg (US)
Thanks: 4,325
Thanked 4,475 Times in 3,440 Posts
I didn't watch, but I don't think aviation is a simpler frame for aerodynamics. The entire subject is extremely complex, perhaps with a few easy to remember "rules of thumb".

As with any subject, the basics are low hanging fruit, with mastery involving lifetime dedication and proclivity.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
The Following User Says Thank You to redpoint5 For This Useful Post:
aerohead (09-12-2022)
Old 09-09-2022, 03:28 AM   #7 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,670
Thanks: 8,134
Thanked 8,919 Times in 7,362 Posts
Quote:
I didn't watch, but I don't think aviation is a simpler frame for aerodynamics. The entire subject is extremely complex, perhaps with a few easy to remember "rules of thumb".
Same four forces, same Reynolds numbers; what better 'frame'?

He's a pilot, it's a build story with tuft testing.
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
Old 09-09-2022, 05:54 AM   #8 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,796

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - CBR600 - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - Dodge/Cummins - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)

Model Y - '24 Tesla Y LR AWD

Pacifica Hybrid - '21 Chrysler Pacifica Hybrid
90 day: 43.3 mpg (US)
Thanks: 4,325
Thanked 4,475 Times in 3,440 Posts
Meh. Laminar flow better than turbulent? Is that what thinking about flight is supposed to reveal? I still refuse to watch based on the dumb title.

Perhaps we should use simple golf ball dimples to beat high gas prices?
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 09-09-2022, 01:21 PM   #9 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 28,670
Thanks: 8,134
Thanked 8,919 Times in 7,362 Posts
The aerodynamicist's tool?


https://www.matcotools.com/productas...yImage_400.jpg
__________________
.
.
Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster

____________________
.
.
Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
  Reply With Quote
Old 09-10-2022, 08:27 AM   #10 (permalink)
Somewhat crazed
 
Piotrsko's Avatar
 
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,408
Thanks: 535
Thanked 1,202 Times in 1,061 Posts
Close but not quite. That would be for peening the edges of metal shafts to retain them.

You need a pick hammer to make proper dimples.

__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
  Reply With Quote
The Following User Says Thank You to Piotrsko For This Useful Post:
freebeard (09-10-2022)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com