Carbon GT mono

[Urs]

Hello together
here some new pictures from the engine part of the chassis.

 

[David W]

Urs, great work. How do you bond the flat panels together? Do they use core material or are they solid.

Thanks
David.

 

[alexander stollznow]

Urs, may i add a couple of questions to the above?
*generally, i believe you are making the flat panels individually, then putting them in position, and joining them with carbon strips, as David W is also asking about. is that right?
*are you using the plywood as the core in the engine bay area? it looks like it, and i am guessing that is for added strength?
*i realise you use vacuum bagging for the floor pan only. is there any structural advantage to vacuum bagging, or is it only about finish and ease?
*lastly, if this car is one day crashed, what sort of repair techniques would you use?

thank you in advance. your work is very impressive. i realise you said it is for a customer, but in any case i hope you see all your good work on the road asap!

alexander.

 

[Urs]

Hello together
I build panels at first with hard foam core.Where it s necessary i cut out the foam core to get directly to the bottom with the carbon sandwich board.After that it will be strengthened with layers of carbon stripes.
To the second question.I dont use plywood as core, i put in, where it s necessary, a special hard plywood for some suspensions or so.
The normal carbon sandwich panels i dont vacume.
To the last point i hope there will never be a crash. we will see.
At first i hope i get the car so far that it could be possible to do a crash with it .
I have some picture from the lower trailing arm suspension. First the negative ,and after the part fresh from the mold. And at last another project a carbon fibre BMW 328.

 

[alexander stollznow]

thank you very much for your reply.

 

[alexander stollznow]

ah, i just realised something... i thought you were using plywood as a core in the engine bay area, due to the light coloured edges of the panels, but i see that is actually the colour of the foam core.

 

[Cliff Beer]

Urs, may i add a couple of questions to the above?
*generally, i believe you are making the flat panels individually, then putting them in position, and joining them with carbon strips, as David W is also asking about. is that right?
*are you using the plywood as the core in the engine bay area? it looks like it, and i am guessing that is for added strength?
*i realise you use vacuum bagging for the floor pan only. is there any structural advantage to vacuum bagging, or is it only about finish and ease?
*lastly, if this car is one day crashed, what sort of repair techniques would you use?

thank you in advance. your work is very impressive. i realise you said it is for a customer, but in any case i hope you see all your good work on the road asap!

alexander.

Alexander, just to comment on one of your questions - yes, there is indeed a very large structural advantage to using vacuum bagging. Why? Well, the carbon is much stronger than the bonding agent, so, the higher the ratio of carbon to bonding agent, the better (assuming there's sufficient bonding agent to bond the carbon fully). Vacuum bagging tends to squeeze the bonding agent more uniformly around the carbon, and also to squeeze out any air pockets. A properly vacuum bagged carbon panel is much stronger in all respects. The downside is that it's not easy to vacuum bag all panels so, understandably, it's not always done.

 

[Urs]

here some new pictures from the carbon mono.
The hinge points from the lower suspension arms.

 

[EGLITOM]

Hi Urs
Very nice, are you planning to do the radius rods out of CF as well or are you going with something more ususal as titanium ?

TOM

 

[Urs]

For the push rods, we take chromo tubes with uniballs .

 

[Urs]

Now i m fitting in the upper hinge points .
After fitting them, i have to put in the bearings for the pushrods.
here some pictures.
A lot of work and nothing to see!!
For strengthening i put in the bearing are a special hard pressed plywood, you see it on the third picture.

 

[Irv Lennert]

Looking great!

I have been watching this thread since you started posting and, to me, this is one of the most exciting build threads I have read through.

I am dying to know how you are dimensioning this project. I figure the only way you could do it is, if you have access to a complete car or you are inferring dimensions from purchased parts or you have your hands on very accurate drawings.

Can you shed some light on this?

 

[Urs]

We could took the measurings from someon in switzerland
who gaves us the possibility to measuring out his two gt40s.
We cant take out some carbon dimensions from an existing car.
But i think we can take a lot out of the airplane engineering that we have.
We have no F1 Engineer. But it could be that it gives something new when there is no car engineer involved in chassis designing.
Our target is to get out a very light chassis, that is also stable without steel tube Spider as a real monocoque.
Greetings from switzerland.

 

[David W]

In your pictures there is what looks like a brown core material showing at the edges of sections. What is the core material?

 

[Urs]

The light brown material on picture 3 is PVC foam.
The Dark brown material is Delignit Panzer Holz.
Greetings from switzerland

 

[Joe Grenier aka bobo]

updates please

 

[Urs]

Here some new pictures.
Building up the engine mounting.

 

[Urs]

here some new pictures of the engine bay. This evening i fitted in the side walls.

 

[Urs]

Hello together

here some pictures from the rear Arc

 

[Jim Rosenthal]

Is there a corrosion or electrolysis problem with carbon fiber next to aluminum? Or does the fact that the CF is coated with epoxy or whatever keep that from occurring?