What thickness / alloy aluminum for floor?

[slngsht]

Does anyone know what's used for floor on Caterhams?

 

What about side skins?

[slomove]

For the skin I would consider 5052 alloy. Rather corrosion resistand and formable. For the floor it does not matter, you can use the cheaper 6061. I have not measured the thickness but estimate the skin of my Birkin to be maybe 30 or 40 mil?

[slngsht]

I think I used .049" 5052 on the Rotus... might go a little thinner this time.

[MHKflyer52]

slngsht,

 

I used 6061-T4 .032 for the side skin as it was what was available when I skinned my car. Just have to anneal it to help shape it so it dose not crack when making very sharp bends. Normal bend radius cold is 1/2-1-1/2T for Bare T4 that is .064 thk. I used the method of bumping it into submission as shown in the photo below the cardboard siding.

The floor I used 28ga (.0149") so I could tack weld it into place for added strength see the photo that is attached although I do not think you want to go that route as your car is a real 7 an not a clone like mine.

 

Cardboard also works and is cheaper but dos not hold up as well and sure is hard to polish...:rofl:....as seen in the attached photo. It dose make good templates though.