/sci/ - Science & Math

would be interested in this also.. awaiting.

simpsons did it

>Why hasn't anyone done this yet?

Mythbusters did it. It worked.

hasn't this already been done?

I coulda swore I had a teacher talk about this, but the cars were so ugly looking that it didn't go anywhere

http://www.yourdiscovery.com/video/mythbusters-dimpled-car/

http://www.yourdiscovery.com/video/mythbusters-dimpled-car/

>>2931780
Golfballs are supposed to fly. Cars are not supposed to fly.

Because car wakes are minute to begin with, and this is by design. The wake of a ball can be many times the balls diameter, while the wake of a vehicle - or in a more abstract example, a NACA wing - is many times smaller than its length scale, as near the trailing edge the streamlines are 'pulled' together as it were. And so the drag reduction from the smaller wake would be vastly smaller than the drag increase from the turbulent flow in the dimples.

>>2931809
This is a bad answer.

>>2931827
But cars are designed for specific pressures to keep them on the road, wouldnt dimpled cars drive poorly

>>2931859
For most modern cars, lift becomes a concern at well above a hundred miles an hour. Before that, the weight of the vehicle is so much that lift is almost completely negligible. The foremost concern is drag, as the effects of fuel economy are readily measurable.

I also postulate to those who posted the Mythbusters video that the result would be substantially different with a subcompact than for a full-size sedan; a economy-focused vehicle has a very small wake to start with. The same reason a jet fighter isn't dimpled, it has a negligible wake too.

>>2931902
So we should dimple 18wheelers? As they have much wake.

more importantly, you know those hybrid cars that operate on gas an electricity? put a small turbine, say a foot and a half in diameter, horizontally on the top of the car

>>2931923
If it could be done in a way that doesn't interfere with efficient containerization, that could be a good idea.

>>2931930
derp derp derp

>>2931944
there are better ways to do it

honestly for anything that's not spherical there are better ways of preventing flow separation than dimpling.

>>2931930
I tjought turbine resistance would never be offset by electrical gain. Is why turboed cars get poor gasmileage when turbo is engaged

>>2931923
>>2931859
>>2931809

Pascal you are a fucking horrible tripfag, gtfo.

Bring back EK, at least he could troll once in a while.

>>2931962 I tjought turbine resistance would never be offset by electrical gain. Is why turboed cars get poor gasmileage when turbo is engaged

Is this a statement?

You don't even know what a turbo on a car is or what it does. Stop being 14.

>>2931962
god you're stupid

but you're right about the first part

>>2931967
>>2931967
who said i wa sever gone, darling?

>>2931989
knowing nothing about turbines (only GED fag), wouldnt they spin as you drove forward or whatever, then have that motion supplement the electric power of the car, like the turning of the wheels already do?

>>2931979
I do to now what a turbo is.

>>2932019
wut?

It mustn't be that good or they would have done it in professional auto racing at least.

>>2932012
The turbine takes energy to turn
It adds a drag force to the car

the extra energy needed to overcome the drag would be more than the energy you would get.

>>2931807
Dude like
wtf

I mean, that was probably some 100kg of clay on the car and it STILL performed better.

Moreover, the dimples weren't even designed or optimized, they were pretty much random.

I would call bullshit if there was a, say, 2% difference, but 11%, wtf.

>>2932030
Hi ek, how have you been?

>>2932042
they were comparing it to a car with smooth clay on it so the weight would be the same.

regardless, yes dimples work because they trip the boundary layer to be turbulent, so it's more resistant to separation. but there are better ways to do that on something that's not a sphere that tumbles end over end through the air.

>>2932030
Goddamn, I made that reaction image in 30 seconds, posted it one time only, over a year ago.

>>2932060
Data Reminescence by Distributed Nodes

>>2932060
yeh i know.
u nostlagia'd?
:D

>>2932058
So uh, why are car manufacturers not doing this?
It's not that hard, it's just stamping the body.

>>2932052
hi pascal! i still have your photo ;)

erm, doing fine-ish, quite busy.
how about you?

>>2932068
I didn't think ANYONE would save it though.

>>2932081
Did you lurk/post on /g/?

>>2932074
Consumer surveys.

DIMPLED SHIPS?

>>2932087
/g/?
er.. rarely. i prefer /sci/
if ALL threads on /sci/'s frontpage are shite and/or uninteresting i see whats on /g/

>>2932088
Im good. My sister is getting married in a few weeks, so it has,been hectic

>>2932089
>Pass legislation that all cars must be dimpled
>People bitch for a while
>One year later, nobody gives a shit

>>2932095
I meant before the existence of /sci/. But I guess not much then either.

>>2932088
>>2932097
Which one is the girl?

>>2932097
hectic for you?
don't you just chillax and await the awesome party?

fun-fun-fun! ;)

>>2932102
when did /sci/ first appear... i think it may predate me.

>>2932113
There are always events going on, and much xoordination with relatives across the globe. But my part is rather small. No mental effort, just completing tasks assigned.

>>2932113
>when did /sci/ first appear
Damn, I can't even remember the month. Early to mid 2010 I think.

>>2932074
what, dimples?
because there are better ways to accomplish the same thing

They do those other things sometimes.
anyway drag reduction isn't the most important part of a car's aerodynamics.

>>2932131
IT reduced gas mileage by 11%, so, whatever you say brah

>>2932119
what tasks do you have to accomplish to proceed with wedding plans? (i am aware not thread related or /sci/ related, but i am curious...)

>>2932122
thats about the time i started i think... i have been here about 1 year.
i cannot remember /sci/ not existing. i think it predates me...slightly.

>>2932122
Dec 09 or jan 10

Somewhere around the new year

>>2932119
>>2932113
>>>/soc/ go here to be social faggots

>>2931996

Fuck off EK

>>2932122
were you stupid enough to post an image containing your tripkey, hun?
testing...

EK here btw...

>>2932157
testing without being a fucking retard...

>>2932146
Well, there are letters to mail,. And beverages to purchase, and packages to collect. beding to arrange for out of town visitors. The house to clean after parties. My sister had already had 3 wedding showers.

>>2932157
That is the old 'lolol' one

>>2932138
if it reduced gas milage then it failed

>>2932151
fuck you!

>>2932163
lol why do you have to do all that? you're her brother, i dont see why any responsibility falls to you.

>>2932163 Well, there are letters to mail,. And beverages to purchase, and packages to collect. beding to arrange for out of town visitors. The house to clean after parties. My sister had already had 3 wedding showers.

>> nonsense detected

>>2932183
Delegation.
The sister and the mother do the important stuff. The brother gets sent on errands. I dont mind, they have very hectic schedules.

>>2932183
take this shit somwhere else e.g text board, msn, skype etc

saged, reported, hidden

>>2932185
>>2932191
GTFO, this doesn't concern you.

>>2932194
i find it admirable that you are so helpful. :)
it's nice of you.

>>2932202
reported for off-topic

>>2932209
reported for being a douchebag
loljk, i don't give a fuck
eat shit and die.

>>2932243
reported again for off-topic and abuse

>>2932254
waisting_you're_fucking_time_.jpg

>>2932243

Does that girl know you're posting her pictures next to inane bullshit? inb4 I get banned for being mean to EK.

>>2932202
Well she is my little sister. But i'm not doing that much. Most of the hectic is simply the atmosphere, I'm just doing a few tasks to help out.

>>2932243
>>2932261

Reported for butthurt