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How about some details/more info on that car? Motor? Class? Speed?
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In the other shots it reduces down to a dot on the horizon.
Here's Bombshell Betty:
The talk I heard was that fences have to be longitudinal, as above; but the 'Vette passed tech inspection, so—who knows?
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Do you have more pics of this?
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http://en.wikipedia.org/wiki/Horn_loudspeaker
Most of the wind tunnel results you see assume a flat plate:
Horn loudspeaker - Wikipedia, the free encyclopedia
Here's an example from Bonneville that attempts to exploit the principle.
I think the air expands and slows, raising the pressure, but aerohead is the one to explain that.
I see the 'bonnevette' as having a full height wheel spat with the outer half removed (which I believe is redundant); bleeding turbulence out the side where it's at the mercy of the ambient flow, instead of under the bottom where it can mix with underbody air.
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I've never seen the Polymetal before. I just looked it up. I wouldn't mind getting my hands on some of that. How much does it cost?
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Oh, right. The three materials are similar—plastic sheet with aluminum skin on one or both sides. Generally 3mm w/.007" skins, but 6mm is available and Grimco MaxMetal (which I haven't seen) has skins twice as thick. Generally available in 4x8, 4x12 and 5x10 sheets. Those choices are handy for fitting your patterns, or for example a 5x10 sheet would make a one-piece bellypan for a VW from the front bumper to the rear torsion bar housing in one piece.
I buy scraps for testing at the local hippy recyclers. Full or partial sheets are available locally at Multi-Craft Plastics at three price points: Walk-in, business, or Bu$ine$$. As I recall a 4x8 sheet was US$100-150.
I have have successfully rolled, braked and sheared Polymetal by hand (with an 18" lever arm). What I'm working on now is through-fastening.