Quote:
Originally Posted by Sven7
Have you considered getting some flat metal rods/stakes to attach to the underside of the kammback? They would be flat, almost unnoticeable and would stiffen the thing more than enough.
OR you could bend the corners down a little bit, with V creases in the top surface. This would strengthen it a lot as well as help it fit template.
I'd be very interested in a tuft test of this to see if the airflow is attached, and what the fins are doing.
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My notes above indicate I installed a 1/8" x 1" aluminum bar stock longitudinally. I only had the one piece handy so I did the other stiffeners in plywood, which is far stiffer than the coroplast.
I didn't mention it in the text, but there is also a 1/8" diam steel rod slipped into the coroplast groove. You can see its shadow going across the photo, and at the left end it's just about obstructed by the trunk's left rear corner. Its been there since the start of the project and allowed the 2.5" flexing I described two posts earlier.
However since it's still vibrating some, it would need more reinforcement to eliminate the vibration. All those stiffeners would need to be riveted in a permanent setup, not duct taped. And the point-contact nature of the rivet fasteners would not give as thorough a contact bond as the duct tape does, so the materials would flex and separate. That is why I think I'm better off with a stiffer base material.
Sorry - no angled folds in the center panel. I want to leave it as clean as possible on the top side to help the aero flow patterns. I don't really like the way coroplast folds, especially if you try folding diagonally across the flutes.
Yes, a tuft test would be good to do. Any ecomodders in southeastern New England, if you're interested we can get together for that. Especially if you have a pickup truck to shoot pics from.