Aerodynamics

[john m]

Change of motor and the roofie was wired through the boot and sits on the rear of the roof .last sign sat middle just before door posts .Inoticed that the handling of the car was effected at speed by the signon the rear of the roof .Does it act like a spoiler and force the rear of the car downon the road .I rewired it and moved it forward .Any body else experience any difference in handling by moving the roofie ,

[Tony]

No

[silverbullet]

Change of motor and the roofie was wired through the boot and sits on the rear of the roof .last sign sat middle just before door posts .Inoticed that the handling of the car was effected at speed by the signon the rear of the roof .Does it act like a spoiler and force the rear of the car downon the road .I rewired it and moved it forward .Any body else experience any difference in handling by moving the roofie ,

It's  a Renault, get used to it.

[Octavia1]

Speakin of handlin

[Dr. Martin Gooter Bling]

I only like my roof sign in the middle of the roof.
I think its my OCD. it's the symmetry I like.
I rented a car for a while and there was'nt enough slack in the wire and it would only sit at the back of the roof.
pissed me off it did.

[Shallowhal]

Speakin of handlin

Immigrant?(couldn't help meself!!)

I changed my roofsign a few years back to the toblerone shape,it sits at the back of the roof(wired from the boot)..i deffo think it's more aerodynamici can feel the car getting pressed into the road when i hit 30kph...or maybe that's the fat fuk sitting in the back!!

[john m]

Change of motor and the roofie was wired through the boot and sits on the rear of the roof .last sign sat middle just before door posts .Inoticed that the handling of the car was effected at speed by the signon the rear of the roof .Does it act like a spoiler and force the rear of the car downon the road .I rewired it and moved it forward .Any body else experience any difference in handling by moving the roofie ,

It's  a Renault, get used to it.

Silver I can see the drag co efficency is effected but no figure for downward thrust .Can you give the figures a look over and see if you can formulate a figure for downwart thrust ..Thanks 

[Shallowhal]

When was the last time you experienced anything with a downward thrust John?

[john m]

Speakin of handlin

Immigrant?(couldn't help meself!!)

I changed my roofsign a few years back to the toblerone shape,it sits at the back of the roof(wired from the boot)..i deffo think it's more aerodynamici can feel the car getting pressed into the road when i hit 30kph...or maybe that's the fat fuk sitting in the back!!

driving over to the port to collect her doing the speed limit thought the steering felt light so moved the roofie forward car seems more stable now .

[john m]

When was the last time you experienced anything with a downward thrust John?

Pauline Kinnahan sat on me head and farted when I was 10 .

[Shallowhal]

The only thing unstable in that car is you John....buying an under the inFluence!!

[Jack Meoff]

The thing that I find strange is your out working.

[john m]

The thing that I find strange is your out working.

WORKING where did you get that impression ."driving over to the port to collect her doing the speed limit thought the steering felt light so moved the roofie forward car seems more stable now ."

[Shallowhal]

When was the last time you experienced anything with a downward thrust John?

Pauline Kinnahan sat on me head and farted when I was 10 .

Love at first shight!!

[Octavia1]

When was the last time you experienced anything with a downward thrust John?

Pauline Kinnahan sat on me head and farted when I was 10 .

https://youtu.be/mP1OTzdB0oI

Use the above formula without yer roof sign off ..... Then do it again with yur sign on....assuming ya done both tests at sea level say at the same temperature an tyre pressures Ie. rolling resistance is the same an ya use exactly same stretch o Road assurin Equal coefficient of friction .... ya Divide the first one  inta the second  an yull get the percentage of added drag of your roof sign....
The effect on handling wud be negligible unless your driving tru ballyfermot at 500 kmh to get out of the kip... An the drag on a Toblerone wud be much greater than a roundy sign due to turbulence caused by the negative angle of attack front an rear an the absence of any assimilation to the desired teardrop profile.....
If that doesn't work...
After that.... Ide day ya bought a heap o shite or yiv a flat tyre johnny