F1technical.net

IIRC Jersey Tom used carbon wheels for FSAE and I think he mentioned issues getting the to hold air. If he still comes around maybe he will chime in.

Coach K says in the video "We've made 20 sets," but forgot to add "And 200 scrap sets."

This is as bad a part and manufacturing technique as I've ever seen for being prone to porosity buildup in the female radii, even if they're being tricky with the tooling inserts for the hollows. They either scrap the wheel or have extra material in the corners to compensate for the porosity. Every single wheel must be inspected by NDT for porosity and delams, which is not easy in that shape.

Aluminium and Magnesium alloys are not much better in Terms of porosity methinks .Todays wheels are madeas forgings in f1 which ist the way to go if you want lowest weight and strength as well as lack of imperfections.
I see no reason why a cf wheel -done properly- would leak -ctg does produce pressure vessels made of cf :

These guys have had carbon wheels homologated for road use for a few years now:
http://carbonrev.com/

flyboy2160 wrote:Coach K says in the video "We've made 20 sets," but forgot to add "And 200 scrap sets."

This is as bad a part and manufacturing technique as I've ever seen for being prone to porosity buildup in the female radii, even if they're being tricky with the tooling inserts for the hollows. They either scrap the wheel or have extra material in the corners to compensate for the porosity. Every single wheel must be inspected by NDT for porosity and delams, which is not easy in that shape.

cf cannot be Held responsible for bad design .There are things you should avoid especially when it Comes to using cf for structural parts.Substituting Aluminium for cf and leave the design as if it were a forged or cast part which will be finished by a machining process is just one of those things ...
Yes the end product is nice ,no question but you could have done yourself a favour and design the part to the strengths of the carbonfibre not trying to do things it is not intended for (tight radii ,for example)

They could also use a mix - cf spokes & forged Magnesium hubs & rims...

One potential issue with CF is in a crash. Currently the idea is to try to keep the wheel attached to the chassis to prevent it flying off and causing injury/damage elsewhere. A crash could cause the CF part to fail resulting in some, or all, of the wheel flying free. At least with the current design the wheel can take a fair amount of punishment and hang together.

I guess this could be overcome but at what cost/effort?

Just_a_fan wrote:One potential issue with CF is in a crash. Currently the idea is to try to keep the wheel attached to the chassis to prevent it flying off and causing injury/damage elsewhere. A crash could cause the CF part to fail resulting in some, or all, of the wheel flying free. At least with the current design the wheel can take a fair amount of punishment and hang together.

I guess this could be overcome but at what cost/effort?

It's better to not use CF for this exact reason. Alloys or metals may not be as strong, but are much more malleable and will simply become dented or bent under huge strain rather than exploding into thousands of small CF shards.

Great Britain Test - Wednesday (09.07.2014)

Lotus' 18" rims

Lotus' 18" rims

Looks great! =D>

stefan_ wrote:Lotus' 18" rims

https://pbs.twimg.com/media/BsFqhZqCYAEY7so.jpg:large

https://pbs.twimg.com/media/BsFpP8tCEAA9ULd.jpg:large

https://pbs.twimg.com/media/BsFp7gVIUAAQE4l.jpg:large

https://pbs.twimg.com/media/BsFqBKgIcAAcgTr.jpg:large

Are they planning to run the car or just park it and take a few pics?

Might be a better idea to use some other styles of rims as well

George-Jung wrote:Looks great! =D>

It does look like Formula E

are they allowed to increase brake-disc size?

George-Jung wrote:are they allowed to increase brake-disc size?

What is the necessity for that?

Looks surprisingly good, nice tight stretch rather than the balloon look. Really accentuates the different offset between the front and rear wheels. Is it usually that big a difference?

Wonder how they've accommodated the suspension compliance lost from the sidewalls...