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Search took 0.05 seconds. Search: Posts Made By: Engeu1
Forum: Aerodynamics 06-26-2020, 12:11 PM
Replies: 84
Views: 9,421
Posted By aerohead
Rocketail investigation

1) Rocketail is a fixed auxiliary-wing, high-lift device, with ancestry back to G. Lachmann & Handley Page Aircraft Company.
2) It is a 'staggered vane' device, borrowing from a slotted, Fowler-Flap...
Forum: Aerodynamics 06-26-2020, 11:34 AM
Replies: 84
Views: 9,421
Posted By aerohead
convergence angle

For prismatic bodies like a truck the angle will be a function of the horizontal length of the ramp, as a percentage of the overall length of the vehicle. There are some graphic drag tables dedicated...
Forum: Aerodynamics 06-26-2020, 11:21 AM
Replies: 84
Views: 9,421
Posted By aerohead
ring-vortex

I believe that the ability to generate the ring-vortex is predicated upon having the semi-elliptical body cross-section. I have no confidence that a rectangular section could support such annular...
Forum: Aerodynamics 06-26-2020, 09:25 AM
Replies: 84
Views: 9,421
Posted By Piotrsko
Irv Culver was a fan of the "coke bottle" effect...

Irv Culver was a fan of the "coke bottle" effect which he described as 1.5 times the height equalled the distance for minimum interference
Forum: Aerodynamics 06-24-2020, 05:41 PM
Replies: 84
Views: 9,421
Posted By aerohead
school bus/ rocket tails/ lateral vanes

1) the school bus foil is for back-soiling issues and would mitigate that issue at the expense of higher drag.
2) the rocketail adds frontal area.
3) the rocketail is lowering the drag of a...
Forum: Aerodynamics 06-24-2020, 05:40 PM
Replies: 84
Views: 9,421
Posted By freebeard
There is some optimal angle— for various...

There is some optimal angle— for various crosswind conditions. :confused:

The fill piece for whatever angle can, apparently, be flat-angled curved or stepped.
Forum: Aerodynamics 06-24-2020, 05:28 PM
Replies: 84
Views: 9,421
Posted By freebeard
This is what I thought works before I started...

This is what I thought works before I started lurking on EcoModder. A chamfer, sort of a 'bullet-tail'.

http://i1271.photobucket.com/albums/jj622/aerohead2/Untitled12_20.jpg...
Forum: Aerodynamics 06-24-2020, 04:55 PM
Replies: 84
Views: 9,421
Posted By freebeard
Imagine a building big enough that the Spruce...

Imagine a building big enough that the Spruce Goose is lost in it.

http://airportjournals.com/wp-content/uploads/0809011_1-1024x682.jpg
Oregon’s Evergreen Aviation & Space Museum Features...
Forum: Aerodynamics 06-24-2020, 04:48 PM
Replies: 84
Views: 9,421
Posted By aerohead
Sprinter Luton van

Okay, thanks ! Looks like she has challenges with the sides and belly, and some images show at least two iterations between the back of the cab door and the beginning of the box sides leading edges....
Forum: Aerodynamics 06-24-2020, 02:54 PM
Replies: 84
Views: 9,421
Posted By aerohead
1987?

Yes, you'll find it in his chapter on commercial vehicles, if memory serves me.
The work on the Ahmed Body will also be of interest. There's a full development of drag and vortex drag as a function...
Forum: Aerodynamics 06-24-2020, 01:45 PM
Replies: 2
Views: 1,103
Posted By aerohead
Box Truck aerodynamics paper

I GOOGLED 'lowest drag box truck in USA'
which took me to :
Aerodynamic Drag Reduction Technology Testing of... NREL,

@ nrel.gov/docs/fy17osti/64610.pdf
Forum: Aerodynamics 06-24-2020, 10:42 AM
Replies: 84
Views: 9,421
Posted By aerohead
no deflector

Wolf-Heinrich Hucho made a comment about commercial vehicles which pertains to the deflector.
At the large scale, reflected in commercial trucks, a leading edge radii equal to 5% of the square-root...
Forum: Aerodynamics 06-21-2020, 01:32 PM
Replies: 84
Views: 9,421
Posted By JSH
Some truck aerodynamics links: NASA: ...

Some truck aerodynamics links:

NASA: https://spinoff.nasa.gov/Spinoff2008/t_3.html

https://www.rtsinc.com/guides/how-better-aerodynamics-lead-fuel-savings

VG Paper:...
Forum: Aerodynamics 06-21-2020, 12:44 AM
Replies: 84
Views: 9,421
Posted By freebeard
The example was extreme. The holed fenders were...

The example was extreme. The holed fenders were probably for racing class rules. A less extreme example would be punching holes in the back bumper of a Honda.
...
Forum: Aerodynamics 06-20-2020, 05:40 PM
Replies: 84
Views: 9,421
Posted By freebeard
Look into Coanda nozzle (Wikipedia)s. ...

Look into Coanda nozzle (Wikipedia)s.

https://ecomodder.com/forum/member-freebeard-albums-aero+technical-picture4870-imagesa.jpg
Forum: Aerodynamics 06-19-2020, 02:14 PM
Replies: 84
Views: 9,421
Posted By aerohead
kind of truck

I believe that he mentioned a box truck. NASA got their's down from Cd 0.88, to Cd 0.238 with a full suite of add-on devices by 1980.
Forum: Aerodynamics 06-19-2020, 02:01 PM
Replies: 84
Views: 9,421
Posted By JSH
What kind of truck are you driving? Trailer...

What kind of truck are you driving?

Trailer tails are good for about a 5 - 6% fuel economy improvement on tractor / trailers. They should work on a trucks too. The fancier ones automatically...
Forum: Aerodynamics 06-19-2020, 01:47 PM
Replies: 84
Views: 9,421
Posted By aerohead
rear length

As far as I know, the DOE/ DOT will allow up to 60-inches of rear elongation if it's for fuel economy.
Forum: Aerodynamics 06-19-2020, 01:10 PM
Replies: 84
Views: 9,421
Posted By j-c-c
I had an idea for rear truck aero improvement,...

I had an idea for rear truck aero improvement, back just after the first gas crisis for a device, that would self retract, hinge to one side when its in driving position but quick rear truck access...
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