Hi .org,
Sorry if this has been covered before... What influence does the roof being on or off, have on the Aerodynamics...?
Posted 16 January 2017 - 06:57 PM
Hi .org,
Sorry if this has been covered before... What influence does the roof being on or off, have on the Aerodynamics...?
Posted 16 January 2017 - 07:12 PM
Not sure it makes much difference really. The VX is not really the most complex thing aerodynamically. I guess having the roof off will disrupt the airflow. However, If you go fast with the soft top on the roof balloons up anyway.
The Vx is more about mechanical grip rather than areodynamics.
Posted 16 January 2017 - 07:19 PM
Posted 16 January 2017 - 07:28 PM
Posted 16 January 2017 - 07:42 PM
if you have your passenger hold there arms up like there on a rollercoaster and screem then it will be faster.
Posted 16 January 2017 - 07:44 PM
It won't make a fig of difference to any lap times
Thanks Darron... that was ultimately what I wanted to know ...and the right answer as I prefer it lots more with the roof off.
Posted 16 January 2017 - 07:50 PM
Posted 16 January 2017 - 09:06 PM
This is covered somewhere in the rear lift/downforce topic. It does make a difference...
Posted 16 January 2017 - 09:57 PM
Posted 16 January 2017 - 10:14 PM
Great answerif you have your passenger hold there arms up like there on a rollercoaster and screem then it will be faster.
Posted 16 January 2017 - 10:45 PM
Fascinatingthis could be helpful
Posted 16 January 2017 - 10:57 PM
The best driver in the world might notice a mediocre difference the rest of us simply won't,the difference is that negligible as to make no difference at allThis is covered somewhere in the rear lift/downforce topic. It does make a difference...
Posted 17 January 2017 - 08:14 AM
mythbusters did a test with a pickup truck, is it more economical to run with the tailgate up or down.
what they found is that while the tailgate was up the rear filled with high air pressure and the new air flowing over the car kinda bounced off the high air pressure creating if you will a virtual roof.. with the tailgate down the high pressure wasnt contained and the air was free to move over the back and out. it was more economical to run with the tailgate up.
i suspect that there is some truth in the vx/elise, the cabin will fill with high pressure and the oncoming air will just bounce on top and over it.. as long as you dont have a helmet sticking out of the top creating a wind brake i cant see it making a real difference.
Posted 17 January 2017 - 08:33 AM
I also think it makes little difference, maybe 10 Kg of lift at 100 MPH.
Think of how much force it would take to press down on the soft-top at 100 MPH to flatten it, this is the amount of lift it is making. My guess is about 10 Kg. By 150 MPH that would more than double to around 22 Kg.
However, I think the turbulence of not having a roof on will likely effect on speed as the buffeting and less clean air will "use up" power.
Edited by Nev, 17 January 2017 - 08:35 AM.
Posted 17 January 2017 - 09:33 AM
Posted 17 January 2017 - 10:12 AM
The VX220 has a roof? Oh bugger, I need to check to see if mine has one. Wonder where it might be as never used it with a roof on. Damn, will need to google image it to see what it looks like.
Posted 17 January 2017 - 06:36 PM
I also think it makes little difference, maybe 10 Kg of lift at 100 MPH.
Think of how much force it would take to press down on the soft-top at 100 MPH to flatten it, this is the amount of lift it is making. My guess is about 10 Kg. By 150 MPH that would more than double to around 22 Kg.
However, I think the turbulence of not having a roof on will likely effect on speed as the buffeting and less clean air will "use up" power.
As Chris says - the soft top lifts a speed not flattends. Would someone like to explain that?
Posted 17 January 2017 - 06:38 PM
I also think it makes little difference, maybe 10 Kg of lift at 100 MPH.
Think of how much force it would take to press down on the soft-top at 100 MPH to flatten it, this is the amount of lift it is making. My guess is about 10 Kg. By 150 MPH that would more than double to around 22 Kg.
However, I think the turbulence of not having a roof on will likely effect on speed as the buffeting and less clean air will "use up" power.
As Chris says - the soft top lifts a speed not flattends. Would someone like to explain that?
Yes we all know it lifts up at speed, that's why I suggested you think about how much force it would take to flatten it (to oppose the lift from it bellowing up) !!
Edited by Nev, 17 January 2017 - 06:40 PM.
Posted 18 January 2017 - 12:20 PM
There can be a difference, though it might not too noticeable.
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