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Forum: Aerodynamics 08-04-2022, 11:08 AM
Replies: 179
Views: 103,710
Posted By aerohead
non-issue

It came up with BMW. They published information from research they performed during the development of one of their passenger cars.
Only in their aero-acoustic wind tunnel did an un-wanted...
Forum: Aerodynamics 08-01-2022, 11:27 AM
Replies: 179
Views: 103,710
Posted By aerohead
because

The car's near-field flow interfered with the mirror, while the mirror's near-field flow interfered with the car.
By moving the mirror away from the body, to perhaps the initial outboard...
Forum: Aerodynamics 07-31-2022, 08:53 PM
Replies: 19
Views: 2,295
Posted By basjoos
When I aeromodded the Aerocivic, it had little...

When I aeromodded the Aerocivic, it had little effect on the 0 to 60 time, but had a huge effect on the 60 to 100 time.
Forum: Aerodynamics 07-29-2022, 12:33 PM
Replies: 179
Views: 103,710
Posted By freebeard
Sucking money out of wallets?

Sucking money out of wallets?
Forum: Aerodynamics 07-28-2022, 11:18 AM
Replies: 179
Views: 103,710
Posted By aerohead
not a single

The Cd 0.1716, 2022 M-B EQXX concept uses door-mounted mirrors.
According to FUJI Heavy Industries, the important aspect of a side mirror is that, it be held some minimum distance away from the body...
Forum: Aerodynamics 04-01-2022, 08:18 AM
Replies: 854
Views: 65,546
Posted By Vman455
Exactly--there's much more going on than wake...

Exactly--there's much more going on than wake area. The flow around cars is three-dimensional, complex, and not possible to predict using simple principles. This isn't me arguing this; look in any...
Forum: Aerodynamics 07-18-2021, 08:33 PM
Replies: 43
Views: 3,640
Posted By freebeard
Concept – Advanced Aerodynamic Vessels...

Concept – Advanced Aerodynamic Vessels (http://www.aavessels.com/concept/)
http://www.aavessels.com/wp-content/uploads/2017/07/Concept-shemas1-uai-1440x297.png

Here's another one. It could be an...
Forum: Aerodynamics 07-08-2021, 01:07 PM
Replies: 43
Views: 3,640
Posted By redpoint5
Nothing is lighter than hydrogen I always...

Nothing is lighter than hydrogen I always thought, so balloons should contain nothing. Eliminates the fire danger too since nothing doesn't burn.
Forum: Aerodynamics 07-07-2021, 10:48 PM
Replies: 8
Views: 1,278
Posted By redneck
. 🤷 Not my job to proofread and correct...

.

🤷

Not my job to proofread and correct published papers.

All I did was copy and paste.
Forum: Aerodynamics 07-07-2021, 01:04 PM
Replies: 8
Views: 1,278
Posted By aerohead
Methods of Reducing Vehicle Aerodynamic Drag

I'll try for a link to this work by Upendar Rohatgi, at Brookhaven National Laboratory.
https://www.researchgate.net/publication/241909472_Methods_of_Reducing_Vehicle_Aerodynamic_Drag
The...
Forum: Aerodynamics 07-06-2021, 11:00 PM
Replies: 15
Views: 1,675
Posted By Isaac Zachary
Mmm.... Interesting. But if you take a car...

Mmm.... Interesting.

But if you take a car and just add more weight over the front wheels the car will tend to understeer more (inertia overpowers traction). And if you do the opposite, add more...
Forum: Aerodynamics 07-06-2021, 10:45 PM
Replies: 15
Views: 1,675
Posted By samwichse
I mean the basic friction equation is: friction...

I mean the basic friction equation is:
friction force = (coefficient of friction)*(normal force)

Static and kinetic friction are the same equation with different values for the coefficient of...
Forum: Aerodynamics 07-06-2021, 08:46 PM
Replies: 15
Views: 1,675
Posted By Isaac Zachary
I don't think the downforce converts to more...

I don't think the downforce converts to more traction linearly. Maybe it would if you could size the tire as downforce is increased or decreased. In other words there's a point where traction...
Forum: Aerodynamics 07-05-2021, 09:41 AM
Replies: 15
Views: 1,675
Posted By M_a_t_t
(I haven't read the thread you mention) The...

(I haven't read the thread you mention)

The only reason I can think is that you don't have to accelerate the mass. And I mean accelerate in a new direction, like turning a corner changes the...
Forum: Aerodynamics 06-18-2021, 06:23 AM
Replies: 138
Views: 11,395
Posted By RedDevil
Oh crikey. We already had a thread on this...

Oh crikey. We already had a thread on this (https://ecomodder.com/forum/showthread.php/gone-wind-something-like-39426.html).

Ah well. I'll repeat my explanation in concise form:
The propeller on...
Forum: Aerodynamics 06-18-2021, 12:56 AM
Replies: 141
Views: 24,668
Posted By JulianEdgar
I don't know if it's a language thing but I am...

I don't know if it's a language thing but I am sorry, I can't understand what you are saying. As far as I can see, nearly every point you make will result in less accuracy.

Certainly, your...
Forum: Aerodynamics 06-12-2021, 02:41 AM
Replies: 138
Views: 11,395
Posted By jakobnev
aerohead - Watch from 9:15 to 9:45, inside...

aerohead -

Watch from 9:15 to 9:45, inside the craft energy always travels from the wheels to the propeller, there is no wind turbine!
Forum: Aerodynamics 06-11-2021, 02:37 AM
Replies: 138
Views: 11,395
Posted By botsapper
"Faster than the wind," impossible they say but the Blackbird settles the debate

Counter-intuitive they say, that a wind-powered craft going straight downwind can go faster (no angled tacking/gybing) than the wind itself.
They built a three-wheeled land craft with a twin-bladed...
Forum: Aerodynamics 06-02-2021, 07:43 PM
Replies: 156
Views: 31,665
Posted By Ecky
Very cool! I don't see people doing things like...

Very cool! I don't see people doing things like this nearly enough anymore. Looking forward to any data you record.
Forum: Aerodynamics 06-02-2021, 07:39 PM
Replies: 156
Views: 31,665
Posted By CigaR007
Box cavity extension

I have been working on a box cavity extension for the CR-Z.

I am happy with the overall result. It is made of cardboard, hot glue, tape and plastic bags to protect the cardboard.

This is a...
Forum: Aerodynamics 06-02-2021, 06:24 PM
Replies: 200
Views: 13,245
Posted By freebeard
So why don't you want to discuss tail-dragger...

So why don't you want to discuss tail-dragger tricycles? IMHO the answer to the thread's question. Fuller and Jocko Johnson are no longer around to carry the torch.
Forum: Aerodynamics 06-01-2021, 12:54 PM
Replies: 200
Views: 13,245
Posted By Isaac Zachary
Maybe. But I don't think it's significant. An...

Maybe. But I don't think it's significant. An airplane at a low level of attack can have a Cd as low as 0.02, or maybe even lower. At a very high level of attack that can go up to 0.18 or 0.20 or so....
Forum: Aerodynamics 06-01-2021, 11:40 AM
Replies: 200
Views: 13,245
Posted By aerohead
never been.... ever created...........

1) 1969 Volkswagen Squareback
2) 1969 Volkswagen Karmann-Ghia
3) 1973 Porsche 911
--------------------------------------------------------------------------------------
These three examples...
Forum: Aerodynamics 06-01-2021, 09:48 AM
Replies: 200
Views: 13,245
Posted By j-c-c
Well in as few words as possible it you really...

Well in as few words as possible it you really think, and apparently have doubled down on your point, "ideas alone are worthless", narrowing your cover in this discussion to include the key word...
Forum: Aerodynamics 06-01-2021, 09:04 AM
Replies: 200
Views: 13,245
Posted By Piotrsko
Stop it both of you. A nose radius is added...

Stop it both of you.

A nose radius is added to flat bottom wings to increase the apparent angle of attack but it doesn't change the actual angle of attack or a slew of other characteristics...
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