Donnington Pics, and Whats this?

[docevi1]

LexSport has posted some pictures he took at Donnington (nice as well) here but whats this car:



Looks like a cross between a Ford Puma and the GTM Libra, and looks better than both imo.

edit:: Just aswered my own question, it is a GTM Still, looks great in that colour combination!

>>> Edited by docevi1 on Friday 10th September 10:25

[anonymous-user]

That car is Greg Stark's GTM Libra V6. The first Libra the factory were co-erced into shoe-horning a 6 pot into.

And I'd have to agree, it looks bloody good in black. That's why the kit in my workshop is in black.

[vojx]

slightly OT, do you know if the rear wing has and handling benefits? thinking of getting the same for my revamped monstrosity

[docevi1]

AFAIK (and I may be wrong) the wings that you put on road cars don't help downforce, they only help high-speed stability.

[D-Angle]

vojx said:

slightly OT, do you know if the rear wing has and handling benefits? thinking of getting the same for my revamped monstrosity

That particular wing would help stability at high speed as mentioned, by helping the airflow to stick to the car and come off the bodywork in a fairly straight line, reducing air turbulence around the car.

Other wings, to help downforce, would have a steeper rake than above, since they work by the air hitting them so hard it actually pushes the car downwards, helping it to stick to the road and handle better. But go too far with them and you will slow a car down, since their main function is to resist the airflow.

I know of someone who fitted the centre section from a Cosworth whaletail underneath his rear axle, mounted directly onto the suspension uprights. This gave a very good advantage as the airflow was acting directly on the wheels rather than pushing down the bodywork over them.

Hope that helps.

[anonymous-user]

D-Angle said:

Other wings, to help downforce, would have a steeper rake than above, since they work by the air hitting them so hard it actually pushes the car downwards, helping it to stick to the road and handle better. But go too far with them and you will slow a car down, since their main function is to resist the airflow.

Afraid not. The way a wing of any sort produces any effect is not by the impact of the air. It's all to do with pressure differentials.

The idea is that air will always fill a void, it won't ever leave a vacuum. As such, the aerofoil shape of a wing causes the air to travel faster over one side than the other reducing the pressure on this side. The pressure differential then produces a force.

The amount of force depends on the lift coefficient of the wing and the speed.

The lift coefficient can be altered by the size of the wing, the profile of the wing, the camber (how much it deviates from the straight line from leading to trailing edge) and the angle of attack - the angle of the wing against the incidental airflow.

The camber and angle of attack of the wing on Gregs car are both minimal. As such, it'll have a relatively low lift (and drag) coefficient. As such, it may provide a minimal amount of downforce but this is only likely to slightly offset the lift generated by the shape of the car, rather than actually produce any positive downforce overall.

Give it 6 months or so and there'll be a Libra on the roads with some interesting aero additions...

[ferg]

It's not an aerodynamic wing........ Greg uses it to do the TeamGTM ironing.

[D-Angle]

LexSport said:

What I meant, only far far better

LexSport also said:

Give it 6 months or so and there'll be a Libra on the roads with some interesting aero additions...

How's that going? Got anything made up on the car itself yet?

[anonymous-user]

D-Angle said:

How's that going? Got anything made up on the car itself yet?

Just sketches and research so far.