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Originally Posted by aerohead
Some things to ponder:
1) You're comfortable publishing Cds from A2 Wind Tunnel.
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I quoted in my Veloce book some tests carried out by a major magazine using an "unnamed aerodynamicist in an unnamed wind tunnel". From what you've said since it appears those tests were done in one of the tiny wind tunnels. Had I known that, I wouldn't have put the material in the book!
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2) DARKO's design consultant was Gary Eaker, designer of the A2 Wind Tunnel.
3) You have expressed a threshold of 5% blockage ratio for automotive wind tunnels.
4) Alan Pope allows 10% blockage ratio for 1:1 - scale automotive tunnels. Hucho allows 10% blockage ratio for automotive wind tunnels.
5) Hucho allows 20% blockage ratio for curved-walled tunnels.
6) Hucho allows 30% blockage ratio for adaptive-wall wind tunnels.
7) Hucho allows in excess of 30% blockage ratio for adaptive- wall tunnels if only zero-yaw measurements are targeted.
8) Hucho allows even higher blockage ratios if 'streamlined' vehicles are tested at zero-yaw in an adaptive-wall tunnel.
Please explain your conclusion about 'tiny' tunnels.
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Easy - car manufactures and professional race teams don't build enormous wind tunnels with moving floors because they like spending money. If a tiny wind tunnel and a fixed floor would do, they'd be using them. They don't.