window up or window down?

Icemoon SG

I read a magazine article saying the window should be down, to reduce the aerodynamic side-effects. Having the window up is like an open parachute, slowing down the car.

The whole issue is about saving fuel.

But I thought having windows down means switching on air-con which eats up fuel as well?!

So how?

ditzy SG

No windows = no problems at all. Laughing

Unidentified SG

Nice one Laughing

Icemoon SG

no windows mean more air will come in? wun it screw up the aerodynamics even more??

ditzy SG

A boeing 747 has so many windows, but no one's complaining right? Laughing

Icemoon SG

talk cock.

none of the windows open mah.

ditzy SG

That proves windows closed better lor. You cannot say boeing 747 inside no aircon also. Laughing

Icemoon SG

talk c-o-c-k.

not as if 747 has the option of leaving windows open when flying. Evil or Very Mad

ditzy SG

But they can leave their doors open. Do you drive around with your doors open? I don't think so. Laughing

nullifi3d SG

Above 80km/h windows down acts as a drag. If you're in crusing speed you're already saving fuel so having the air-con on will have not much of an effect.

You're theory is the opposite. Windows up is more aerodynamic than windows down.

Icemoon SG

opps .. I didn't know having windows down will slow down the car on the expressway. Shocked

mr sunray SG

Originally posted by Icemoon:

opps .. I didn't know having windows down will slow down the car on the expressway. Shocked

Think < 80km/h won't slow your car down but > 80km/h will.

So open windows < 80km/h = no problem.

But open windows > 80km/h = big problem.

So which problem you want??

Icemoon SG

I will close window on expressway from now on ..

Tayysj SG

hmm convertible how? open window + roof.. so slow until like snail on expressway la? aiyo poor convertible.. slower than snail

mr sunray SG

Haha, interesting question.

Won't crawl like snail but just have to floor hard on accelerator.

Praetorian111 SG

convertible open up the roof and windows there will be less drag if it is a convertible. For there with roof it will be 80km/h with all windows open and more than that close up all the windows.
Well well, the most you can save a few dollars but will you like to go on a date sweating like a dog... worst ask your date to endure the hot sun with you.... ??

udontknowme SG

winter -40 degrees drive with windows down the best Rolling Eyes

nullifi3d SG

It's not a matter of the car slowing down per se. For every car design there is a certain amount of drag. In this cas the matter of having the windows down above 80km/h will create a little more drag but not substantial enough to cause the car to slow down.

The theory suggests that if you have your windows down at 80km/h or above the drag affects FC.

But i love to have the windows down on the expressways at night because -
1) Its cooling and it gets the odour out of the car
2) With the wind flow increasing in my cabin as my speed increases it is a direct hindrance to prevent me from excessive speeding.

ceecookie SG

i wonder if winding down all of the windows + brake
can act as an air brake... Laughing

Theatre Of Dreams SG

i think you've mixed up "up" & "down", unless your windows so special, close by winding down.

yes some people switch off air-con to save fuel, so they wind down their windows for ventilation. but this is only applicable for

but at >80km/h, this method will backfire. the shape of the car is already aerodynamically designed to minimise drag. having the windows down at high speed will create turbulence at the windows and hence increase drag.

i can't be sure if that is technically accurate but that's the rough idea of it.