View Single Post
Old 05-16-2020, 12:27 AM   #8 (permalink)
gumby79
Master EcoModder
 
gumby79's Avatar
 
Join Date: Dec 2014
Location: Butte, Montana
Posts: 714

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 24 AUTO
Pickups
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.84 mpg (US)
Thanks: 206
Thanked 416 Times in 269 Posts
Quote:
Originally Posted by Piwoslaw View Post
Quote:
Originally Posted by guyed
if you look to the left of the cab, you can see the effectivly sheet plastic 1/4 circle vertical deflector.
??
The only semicircle thing I'm making out to the left of the cab is the spot / convex Mirror On the passenger side. Or are you referring to what the arrows are pointing to on the front beside the grill above the head lights?
----

Quote:
Does this help by deflecting towards the rear air that would normally be pushed to the side, thereby gaining forward momentum (sort of like a sail), or is this outweighed by the penalty of extra drag?
Primary purpose in my eye , is the your first part of your question. To divert air to the rear. That would otherwisewould go into making a larger dynamic frontal aera.

Quote:
That visor has a much smaller outlet than inlet. It takes energy to compress air.
+1
Agreed compressing AKA working cost energy. But with the right geometry the parasitic loss can be reduced for a net gain as dimminstrated
HEAR.
+Cd*-A can be LESS FUEL
Dose the extra work (+Cd) offset the reduced dynamic A(-A)
For a totle reduction of CdA? That depends on how you design it. I'm willing to put money these pictured on this truck reduced the total.
__________________
1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20


Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg


  Reply With Quote