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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-01-2020, 09:48 AM   #11 (permalink)
EcoModding Apprentice
 
Join Date: Jul 2015
Location: Louisiana
Posts: 240
Thanks: 150
Thanked 87 Times in 70 Posts
I don't believe I'd want to submerge a few hundred volts DC in a car while forging a stream any more than submerging 120volts AC in a toaster while bathing in the tub.

__________________
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 06-01-2020, 12:44 PM   #12 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 8,128
Thanks: 0
Thanked 884 Times in 784 Posts
Quote:
Originally Posted by MeteorGray View Post
I don't believe I'd want to submerge a few hundred volts DC in a car while forging a stream any more than submerging 120volts AC in a toaster while bathing in the tub.
I wouldn't expect some cheap home appliance to be so well insulated as most mobile applications.
  Reply With Quote
Old 06-01-2020, 11:46 PM   #13 (permalink)
Master EcoModder
 
Join Date: Aug 2018
Location: USA
Posts: 332

Jeep - '97 Jeep Cherokee Sport
90 day: 19.36 mpg (US)

Blueberry - '07 Toyota Camry SE
Thanks: 118
Thanked 60 Times in 54 Posts
My off road bumper did not noticeably impact my mpg. I used to have the stock bumper with the end caps removed.
Attached Thumbnails
Click image for larger version

Name:	20200523_100329.jpg
Views:	30
Size:	60.4 KB
ID:	28370  
  Reply With Quote
Old 06-02-2020, 09:01 AM   #14 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 8,128
Thanks: 0
Thanked 884 Times in 784 Posts
Quote:
Originally Posted by Taylor95 View Post
My off road bumper did not noticeably impact my mpg.
The stock bumper was also not really so aerodinamically-enhanced. Well, the slightly curved edges might actually fare better than the stock design when it comes to aerodynamics...
  Reply With Quote
Old 06-02-2020, 09:18 AM   #15 (permalink)
Master EcoModder
 
Join Date: May 2019
Location: California
Posts: 361

Tahoe 2020 - '08 Chevy Tahoe H
90 day: 20.75 mpg (US)
Thanks: 0
Thanked 78 Times in 72 Posts
Quote:
Originally Posted by bobo333 View Post
Many of you may have seen my new Off-Road Prius build that's in the works (if not there's a link in my signature).

One major component I would like to upgrade is the front bumper. Obviously the factory bumper is fairly good for aero and can be improved with a simple grille block and (more) flat floorpan, however it does not give the best approach angle for off road abuse nor is it strong enough for highway animal strikes.

This is where my study begins, how much compromise do I need to have to get my perfect bumper? Where are big advantages available in one area that detracts least from the other area?

The end product will most likely end up somewhere in the vast range between this:
I would compare HYbrid models to non hybrid models of the same year/ model some times the hybrid models get a better coefficient drag rating

a good example is the one i have tahoe hybird they carried the design to the 2015 model (with a face lift obviously ) to keep the lower drag to 0.34 while the non hybrid tahoe gets 0.38 even worse if you got a Z71 trim (bulky fenders) 0.40-0.42 drag rating
  Reply With Quote
Old 06-02-2020, 09:28 AM   #16 (permalink)
Master EcoModder
 
Join Date: May 2019
Location: California
Posts: 361

Tahoe 2020 - '08 Chevy Tahoe H
90 day: 20.75 mpg (US)
Thanks: 0
Thanked 78 Times in 72 Posts
Quote:
Originally Posted by JulianEdgar View Post
I wonder how HV cables and fording go together?
the high voltage is Isolated water tight(i.e inverter) except for the battery (for the air cooling system)

but the battery will just short to it self that is how they work

as the Negative and positive is very close together a couple of inches apart

so the battery will nuke it self


A. will boil the water
B. cause electrolysis, the water causing it to make hydrogen and oxygen.

Last edited by Tahoe_Hybrid; 06-02-2020 at 09:37 AM..
  Reply With Quote
The Following User Says Thank You to Tahoe_Hybrid For This Useful Post:
bobo333 (07-02-2020)
Old 06-02-2020, 02:56 PM   #17 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 16,243
Thanks: 4,271
Thanked 5,475 Times in 4,362 Posts
Quote:
This is where my study begins, how much compromise do I need to have to get my perfect bumper? Where are big advantages available in one area that detracts least from the other area?
[speculative discourse]
Stagnation point height vs approach angle
Cybertruck style: Center front pushed forward but flattened, strong chamfers on the sides.
[/speculative discourse]
__________________
.

Donít push your slower friends down in an attempt to save yourself from a bear, advises National Parks Service

_________________
  Reply With Quote
The Following 2 Users Say Thank You to freebeard For This Useful Post:
bobo333 (07-02-2020), JulianEdgar (06-04-2020)
Old 07-02-2020, 08:52 AM   #18 (permalink)
EcoModding Apprentice
 
Join Date: Mar 2012
Location: Adelaide, Australia
Posts: 234

F Truck - '77 Ford F100 2x4, single cab, lwb
90 day: 8.75 mpg (US)

Bombodore - '98 Holden Commodore Exec Wagon
90 day: 21.35 mpg (US)

Civic - '93 Honda Civic GL
90 day: 36.62 mpg (US)

Jim The Prius - '09 Toyota Prius
90 day: 36.66 mpg (US)
Thanks: 147
Thanked 59 Times in 34 Posts
After his first proper off-road adventure over the weekend Jim The Prius is ready for some aerodynamic testing, first the broken factory undertray needed to come off, it has seen its fair share of mud and rocks and will be replaced by a much sturdier aluminium version, possibly reinforced with a steel frame.


Lots of important things to protect under there, as well as improving airflow to make up for the losses the lift and big wheels/tyres have caused.


Next step is to do a base line test, I've found a flat, straight road that allows me to do 110kmh for multiple hours at a time so I will hold a constant speed for as long as possible while changing various things and recording the average milage from the factory display, windows up/down and mirrors in/out should give me a good baseline before I do front bumper on/off, stay tuned for results!
__________________


(Posted in 2020) 2009 Prius Off Road project: https://ecomodder.com/forum/showthre...ide-38366.html

(Posted in 2012) 1977 F100 Project: http://ecomodder.com/forum/showthrea...tml#post310326
  Reply With Quote
Old 07-02-2020, 05:47 PM   #19 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 8,128
Thanks: 0
Thanked 884 Times in 784 Posts
Quote:
Originally Posted by bobo333 View Post
After his first proper off-road adventure over the weekend Jim The Prius is ready for some aerodynamic testing, first the broken factory undertray needed to come off, it has seen its fair share of mud and rocks and will be replaced by a much sturdier aluminium version, possibly reinforced with a steel frame.
I don't remember what's the alloy more frequently used for aircraft structural repairs, but this seems to be the best to make the undertray as its structural integrity renders a steel reinforcement unnecessary.
  Reply With Quote
The Following User Says Thank You to cRiPpLe_rOoStEr For This Useful Post:
bobo333 (07-02-2020)
Old 07-03-2020, 09:57 AM   #20 (permalink)
Somewhat crazed
 
Piotrsko's Avatar
 
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 1,146
Thanks: 83
Thanked 302 Times in 258 Posts
Structural is generally 2024 with or without alclad or 6061 if you need to weld it at least on Boeing

  Reply With Quote
The Following User Says Thank You to Piotrsko For This Useful Post:
bobo333 (07-03-2020)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com