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freebeard · 11-29-2014, 10:32 PM

I wouldn't use plywood anywhere on the outside bottom of a car unless the edges are very well sealed, like soaked in epoxy 1/2" deep.

The Lang Racing article suggests Alumilite. Similar products are Polymetal and Grimco MaxMetal. 3mm Polymetal is described as stiff as 5/8" ply at 1/10th the weight. Having experimented with samples I believe it. It is also available in 6mm, and MaxMetal is available with thicker aluminum skins.

I doubt the ABS would be as stiff.

Edit: Here's an interesting article: http://www.speedhunters.com/2012/06/...-is-the-force/

There is a venturi that starts mid-vehicle and passes over the differential and exits through the rear deck lid. Air scoops in the rear doors dump through the rear bumper.

11-29-2014, 10:32 PM	#46 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 28,547 Thanks: 8,089 Thanked 8,880 Times in 7,328 Posts	I wouldn't use plywood anywhere on the outside bottom of a car unless the edges are very well sealed, like soaked in epoxy 1/2" deep. The Lang Racing article suggests Alumilite. Similar products are Polymetal and Grimco MaxMetal. 3mm Polymetal is described as stiff as 5/8" ply at 1/10th the weight. Having experimented with samples I believe it. It is also available in 6mm, and MaxMetal is available with thicker aluminum skins. I doubt the ABS would be as stiff. Edit: Here's an interesting article: http://www.speedhunters.com/2012/06/...-is-the-force/ There is a venturi that starts mid-vehicle and passes over the differential and exits through the rear deck lid. Air scoops in the rear doors dump through the rear bumper. Last edited by freebeard; 11-29-2014 at 10:52 PM..