Reply to "Heavy Uprights"

hemip (Guest)

Unsprung weight IS important. Steel BOX-construction would be great. Of course, aluminium is possible but I doubt there will be any benefit. The E (flexing) module is proportional to weight, so there is a greater selection of material in steel.
Billet upright will allways be heavier as one side must remain OPEN. And to recover torsional strength, material thickness must be added.
I made a BOX casting, but this involves sky-high tool fabrication and will not justify fabrication. However, my uprights weight 8,8 pounds and standard iron 13,75 pounds.
You may have a look at my site http://hem.passagen.se/hemipanter/
A bit down the side of the site.
An A-arm may justify an "open" billet profile since there will be mostly straight loads. But an upright is exposed to a number of load directions. And serious racing uprights are allways of the box type.

Goran Malmberg

1/27/049:28 AM

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