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-   -   Random Aerodynamic Oddity of the Day Thread (https://ecomodder.com/forum/showthread.php/random-aerodynamic-oddity-day-thread-35653.html)

kach22i 09-20-2017 02:04 PM

Random Aerodynamic Oddity of the Day Thread
 
Random Aerodynamic Oddity of the Day Thread

A thread to place some of the weird things you come across.

https://elpoderdelasgalaxias.wordpre...012/10/page/5/
https://elpoderdelasgalaxias.files.w...0/still072.jpg
Quote:

1936 H G Wells based movie “Things to Come”
I'm thinking such a helmet could be useful in a trike design or someplace where a really small canopy is too expensive or heavy to implement.

It was just too darn silly not to share. :)

Film
Things to Come (1936)
http://www.cageyfilms.com/2013/07/bl...-to-come-1936/
http://www.cageyfilms.com/wp-content.../things_13.jpg

Easier to pressurize a suit than an entire cockpit I guess.

https://www.pinterest.com/pin/415034921879688235/
https://i.pinimg.com/564x/49/68/61/4...dieselpunk.jpg

Remove the wings and you might get a road vehicle out of it.

People will be sure to get out of your way.

kach22i 09-20-2017 02:05 PM

2010
Silent Helicopter Blades

https://www.trendhunter.com/trends/blue-edge
http://forums.pelicanparts.com/uploa...1505250689.jpg
Quote:

Cutting down on the 'blade-vortex interaction' that causes the loudness of helicopters today, Blue Edge works with another technology called Blue Pulse to combat that phenomenon.

According to Gizmodo, by adding 3 flaps to the edge of the Blue Edge blade, they "move up and down at 15 to 40 times per second, using piezoelectric motors that also help to reduce the blade-vortex interaction."
Video in link above.

MetroMPG 09-20-2017 04:42 PM

Great thread idea. Subscribed and on the lookout.

kach22i 02-15-2018 12:27 PM

A wind tunnel and laser guidance helped the Olympic luge team learn about uniform tech
https://www.popsci.com/luge-wind-tun...MPID=ene021518
https://www.popsci.com/sites/popsci....zdBiW&fc=50,50
Quote:

The key piece of equipment at the San Diego Wind Tunnel is a 20-foot fan, powered by a 2,250 horsepower motor, that accelerates air up to 270 miles per hour. .....................

“We taught them some things about the fabrics that they were using,” he adds. To keep the person wearing the different suits in the same position and minimize variables, they used a laser guidance system, projecting the laser’s light onto a specific spot on the helmet.

freebeard 02-15-2018 04:49 PM

Can we include hydrodynamics? One of my current fascinations (as of 20180212) is the M-hulled M-80 pentamaran: Solution... Permalink #17

https://i0.wp.com/images.gizmag.com/...0206115319.jpg
https://oceanandairtechnology.wordpress.com/2010/08/20/stiletto-experimental-ship-with-carbon-fiber-m-hull-design-tops-50-knots-60mph/
(I guess it is compressing air in it's passive ram-jets) ...and it's surface-piercing (anti-cavitation?) propellers:

https://i0.wp.com/images.gizmag.com/...0206113458.jpg
[ibid]

Frank Lee 02-15-2018 06:50 PM

What could be more random or odd than the Ram Implosion Wing?

https://i.ytimg.com/vi/wydiormQQ50/maxresdefault.jpg

gumby79 02-16-2018 01:50 PM

Frebeard
Would it be better to spin the water opposite the prop kind of like running a stator Upstream of a fan to coach the incoming flow to be moving at a right angle to the direction it will be coming out of the fan improving it's forward bite on the air

freebeard 02-16-2018 02:25 PM

Frank Lee never forgets.

gumby79 — A Gurney flap or something? It would probably add more drag than thrust. I suspect the problem with anti-cavitating props is air bubbles eating the metal. Those flutes may be for vortex generation or something.

freebeard 02-22-2018 04:14 PM

Days on end without oddity? Bo-ring.

https://i.kinja-img.com/gawker-media...baqdnfppxw.png
https://jalopnik.com/i-bet-we-can-id...aun-1823206743

https://i.kinja-img.com/gawker-media...jjvz8pxvkj.gif
https://jalopnik.com/too-low-drone-o...ves-1796065245

kach22i 04-20-2018 10:06 AM

I found something odd, and if all "fluid dynamics" are fair game then explain the advantage of the gap/slot before the movable portion of the rudder.

MORE random pics...... - Page 4443 - Pelican Parts Technical BBS
http://forums.pelicanparts.com/uploa...1524228259.jpg

I have an idea or two but want to see if it matches anyone else's ideas.

freebeard 04-20-2018 12:02 PM

https://s-media-cache-ak0.pinimg.com...1976dea6f7.jpg
https://s-media-cache-ak0.pinimg.com/736x/82/06/c0/8206c0d6a82d4cab8ee4291976dea6f7.jpg

Cross-current performance? Else, no idea.

kach22i 04-20-2018 06:30 PM

Quote:

Originally Posted by freebeard (Post 567336)
Cross-current performance? Else, no idea.

The delay of vortex generation, not sure if it worked as intended.

Alfa Romeo BAT (see Bat-5)
https://en.wikipedia.org/wiki/Alfa_Romeo_BAT
Quote:

The BAT 5 was the first of the Bertone-Alfa Romeo BAT project. It was first shown at the Turin Auto show in 1953. The design of the model was based on a study of aerodynamics. The shape of the front in fact aims to eliminate the problem of airflow disruption at high speeds. The design also aims to do away with any extra resistance generated by the wheels turning, as well as achieving a structure which would create the fewest possible air vortices.
Not too shabby.

Quote:

The car had a drag coefficient of 0,23.[4]

samwichse 04-20-2018 11:19 PM

https://upload.wikimedia.org/wikiped...ar_3.16.18.jpg

2018 Toyota Camry has ducts for flow separation under the rear tail lights.

Piwoslaw 04-21-2018 12:07 AM

Quote:

Originally Posted by kach22i (Post 567329)
I found something odd, and if all "fluid dynamics" are fair game then explain the advantage of the gap/slot before the movable portion of the rudder.

My 2 guesses:
  1. To increase the flow over the movable part. This may slightly increase drag, but improves the efficiency of the rudder, allowing it to be smaller. And a smaller rudder reduces drag and/or noise.
  2. When the movable part turns to one side, there will be lower pressure on the "back" side, causing additional noise. The gap allows this void to partially fill in, reducing noise.
For a submarine silence is more important than fuel efficiency.

Frank Lee 04-21-2018 02:04 AM

https://www.wired.com/wp-content/upl...er-inline4.jpg

freebeard 04-21-2018 10:53 AM

https://3.bp.blogspot.com/--14WoOp7l...0/ryhwerwe.JPG
Just A Car Guy: IH land speed racing big rig, the Neighbours Nightmare. 1950 IH model R190 that's went 151mph, purpose built to race on the salt flats at Lake Gairdner, currently powered by a Twin Turbo Detroit 12v71

aerohead 04-21-2018 01:22 PM

explain
 
Quote:

Originally Posted by kach22i (Post 567329)
I found something odd, and if all "fluid dynamics" are fair game then explain the advantage of the gap/slot before the movable portion of the rudder.

MORE random pics...... - Page 4443 - Pelican Parts Technical BBS
http://forums.pelicanparts.com/uploa...1524228259.jpg

I have an idea or two but want to see if it matches anyone else's ideas.

My guess is,that it's about the 'acoustic' signature of the boat,which an electronics officer aboard an 'enemy' vessel might pick up as an anomaly, when dived.
At zero-yaw of the rudder,the water coming to it would be 'clean',as well as the water coming off it.
A common 'slot' between the two might generate more 'noise.' Potentially 'deadly.'

freebeard 04-27-2018 12:35 AM

Not really aerodynamic and not really an oddity, I just wanted to point to the 4-door hardtop station wagon, a body style that last only 3-4 years:

http://1.bp.blogspot.com/-nKuo1LIGWJ...0/DSC_0266.JPG
http://1.bp.blogspot.com/-UZ7kg1C_Q1...0/DSC_0262.JPG
Just A Car Guy: Buick Caballero

I don't know that I've ever seen a Cabellaro. It's distinctly different to the Chevy Nomad/Pontiac Safari 2-doors.

Bonus: an Art Deco wagon:

https://1.bp.blogspot.com/-w8v9a1e4x...ft-Corp-05.jpg
https://3.bp.blogspot.com/-JnKkdGVWQ...-AUTOWAGON.jpg
Just A Car Guy: 1949 American Metalcraft streamlined Autowagon (Thanks Robert!)

kach22i 04-27-2018 04:40 AM

Quote:

Originally Posted by freebeard (Post 567947)
Not really aerodynamic and not really an oddity, I just wanted to point to the 4-door hardtop station wagon, a body style that last only 3-4 years:

Not sure what you mean, almost all station wagons are (were) four door.

I'd like to see a side by side comparison of a wind tunnel test using old wrap-a-round windshields compared to the later ones that followed with a more sloped inclination angle but sharper corner edges.

I bet it would be a near wash or equal.

From the wind tunnel test videos I've seen almost no air goes directly over the car, most of it angles off the hood and windshield and slides off near the rear view mirror location. This would make the windshield radii at the corners most important.

That little red wagon reminds me of this.

https://www.pelicanparts.com/swapmee...gekuhltgallery
https://www.pelicanparts.com/swapmee...2018/Pic13.jpg
https://www.pelicanparts.com/swapmee...ages/Pic14.gif

Sort of an aero-oddity of a trailer too.

Wish I had a side profile view.

EDIT:
while looking up something completely different I found another view.

http://flatsixes.com/cars/porsche-35...ler-rod-emory/
http://forums.pelicanparts.com/uploa...1525047926.jpg

kach22i 04-27-2018 12:38 PM

Maybe not so unusual, but I've never seen such a complex one.

Something interesting... Cabriolet Wind Deflector - Pelican Parts Technical BBS

freebeard 04-27-2018 01:56 PM

Quote:

Not sure what you mean, almost all station wagons are (were) four door.
...the 4-door hardtop station wagon...

If you search Youtube for this title you get a discussion between them which should know.

http://ecomodder.com/forum/member-fr...08-5-46-57.png

cRiPpLe_rOoStEr 04-27-2018 11:16 PM

Quote:

Originally Posted by kach22i (Post 567954)
almost all station wagons are (were) four door

2-door wagons used to be quite popular in Brazil until mid-'90s, but anyway, what about the Alfa Romeo 156 Sportwagon with its concealed rear door handles? Ain't it beautiful?
http://3.bp.blogspot.com/-HY4KChcdZk...sportwagon.jpg
http://4.bp.blogspot.com/-nbBtBg6y4d...n+traseira.jpg

freebeard 04-28-2018 01:51 AM

https://barnfinds.com/wp-content/upl...on-630x355.jpg
https://barnfinds.com/super-wagon-19...bler-american/

Not mine, but I drove a green one in college, before all the VWs. The door window frames are a single aluminum extrusion, symmetrical so one part fit either side. The front and rear bumpers were a single part #. It didn't have an intake manifold, the carb bolts right to the head. It didn't have an exhaust header, the pipe clamped to the side of the block.

https://barnfinds.com/wp-content/upl...ne-630x355.jpg

kach22i 05-03-2018 08:21 PM

Another Ford Bi-Wing stepped louvered thingy-ma-jig, like the Merkur XR4Ti and Escort RS Cosworth?

Cobra 230 M.E. Concept
Debut: Chicago Auto Show, 19876

DrivingEnthusiast: Cobra 230 M.E. Concept
http://drivingenthusiast.net/sec-for...a-230-me-3.jpg
http://drivingenthusiast.net/sec-for...a-230-me-1.jpg
http://drivingenthusiast.net/sec-for...a-230-me-2.jpg
Quote:

The purpose of the Cobra 230 M.E. concept was to explorer a styling theme for the upcoming mid-engine sportscar code-named GN34. It may or may not have represented the final styling of the GN34, which wasn't scheduled to go into production until at least 1989 anyway. But it does show Ford's thinking.

MetroMPG 05-03-2018 09:09 PM

Anybody else noticed the "canines" / fangs on the air dam of the Chevy Cruze (and possibly a couple of other GM cars)?

I'll see if I can find a pic...

MetroMPG 05-03-2018 09:15 PM

1 Attachment(s)
Here it is, from a Cruze hatch:

http://ecomodder.com/forum/attachmen...1&d=1525396513

Full image: http://yoursinglesourcefornews.com/w...-Hatchback.jpg

Aesthetics? Stiffening? VG voodoo?

19bonestock88 05-03-2018 10:42 PM

I’ve also seen something similar on the Spark... I vote that it’s for stiffness but I don’t know for sure

19bonestock88 05-03-2018 10:44 PM

Quote:

Originally Posted by cRiPpLe_rOoStEr (Post 568051)
2-door wagons used to be quite popular in Brazil until mid-'90s, but anyway, what about the Alfa Romeo 156 Sportwagon with its concealed rear door handles? Ain't it beautiful?
http://3.bp.blogspot.com/-HY4KChcdZk...sportwagon.jpg
http://4.bp.blogspot.com/-nbBtBg6y4d...n+traseira.jpg

I love that Alfa... so beautiful... I’ve always wanted a 156 sedan, with the V6

Frank Lee 05-03-2018 11:54 PM

I think if they needed stiffening they'd have put ribs on the backside. So I vote for aero trick but what for I don't know.

niky 05-04-2018 04:28 AM

Quote:

Originally Posted by MetroMPG (Post 568647)
Here it is, from a Cruze hatch:

http://ecomodder.com/forum/attachmen...1&d=1525396513

Full image: http://yoursinglesourcefornews.com/w...-Hatchback.jpg

Aesthetics? Stiffening? VG voodoo?

I wonder.

Given the position, I'm guessing it's something to do with air hitting the wheels.

Those vanes could be kicking up vortices or creating pockets of air that keep the air from sliding under the airdam right where the wheels are, possibly making a virtual airdam whose effect extends below the physical one right at that specific spot.

The ones on the Spark are also situated around the wheels.

https://ymimg1.b8cdn.com/uploads/car...st1280_090.jpg

Or (more realistically) it could be a way of simply kicking the air further out to the side so it clears the wheel wells.

Frank Lee 05-04-2018 09:04 AM

https://i.pinimg.com/736x/d4/10/d2/d...84c8722bc5.jpg

120mpg way back in the day. Swoopy but not all that aero. But the small frontal area is tough to beat.

freebeard 05-04-2018 01:32 PM

No worse aero than the MIT stackable car:
https://i.kinja-img.com/gawker-media...jubmte3jpg.jpghttps://gizmodo.com/318436/stackable-cars-solve-urban-transportation-problems-by-sharing

aerohead 05-05-2018 01:18 PM

fangs
 
Quote:

Originally Posted by MetroMPG (Post 568646)
Anybody else noticed the "canines" / fangs on the air dam of the Chevy Cruze (and possibly a couple of other GM cars)?

I'll see if I can find a pic...

They're supposed to be for crosswind stability,killing any chance for a yawing moment by forcing separation at the 'fang.'
They'd also kill crosswind bi-stable flow-induced flutter.

freebeard 05-05-2018 03:03 PM

http://ecomodder.com/forum/member-fr...dynamics-c.jpg

In this infographic they appear in the lower right as 'vortex traps'.

freebeard 05-16-2018 07:01 PM

https://3.bp.blogspot.com/-Q6aEgkkf_...muoo8_1280.jpg
JACG:There were some mighty big Goodyears on Admiral Byrd’s Antarctic Snow Cruiser in 1939

It was an aircraft carrier. A little touch-up on the wheelwells and a boat tail is all it needs. It couldn't make 13mph. :)

freebeard 05-18-2018 06:32 PM

https://4.bp.blogspot.com/-HfwjQYk2_.../main_1500.jpg
http://justacarguy.blogspot.com/2018/05/were-there-real-flying-saucers-yeah.html

Ricer UFO in seekrut wind tunnel testing.

freebeard 05-20-2018 10:01 PM

https://2.bp.blogspot.com/-q3t6QflJn...0/DSC_0022.JPG
Just A Car Guy: check out this cool streamliner transporting rig!

kach22i 05-22-2018 05:02 PM

I don't think height off the pavement is the biggest thing working against this rear diffuser, maybe a possible messy underbelly that I have not seen is.

Interesting '86 944 Turbo Widebody - Pelican Parts Technical BBS
http://forums.pelicanparts.com/uploa...1526968591.jpg
http://forums.pelicanparts.com/uploa...1526968669.jpg

Your take?

If you read some of the comments you get an idea of the debate over it.

Where it says PORSCHE on the side sure looks like a side skit to me.

http://forums.pelicanparts.com/uploa...1526968940.jpg

The rocker panel does sitck out more in the one first posted, makes the door look like it's set back, not flush.

Another black 944

http://www.moibbk.com/gallery/model-...ack-8.jpg.html
http://www.moibbk.com/images/porsche-944-black-8.jpg

The rocker panel does stick out more in the one first posted, makes the door look like it's set back, not flush.

A lot less drag and weight on the stock car, I'll say that much.

gumby79 05-22-2018 05:39 PM

Quote:

Originally Posted by kach22i (Post 567329)
I found something odd, and if all "fluid dynamics" are fair game then explain the advantage of the gap/slot before the movable portion of the rudder.

MORE random pics...... - Page 4443 - Pelican Parts Technical BBS
http://forums.pelicanparts.com/uploa...1524228259.jpg

I have an idea or two but want to see if it matches anyone else's ideas.

my guess is that the sub is seldom the traveling in a straight line, so straight forward Hydro Dynamics would not apply. There may be less turbulence/ noise while turning.

freebeard 05-22-2018 10:17 PM

Agree. The fences fall short. You can see clear through the off-side wheel. And the diffuser only fills the middle two quarters of the rear.

Chris Runge is at it again:
https://i2.wp.com/rungecars.com/wp-c...9.42.44-AM.png

https://www.youtube.com/watch?v=k9w9JOzod_o


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