clearance
In wind tunnel testing it is recommended that the vehicles frontal area be no more than 5% of the tunnels test section cross-section to minimize 'wall' effects.
Also,when a vehicle is next to you,a venturi is formed between the two vehicles,accelerating the air to a lower pressure and higher velocity which could impact your results.
I would recommend as large a clearance as legally possible and still maintain your 'shot.'
Gran Prix drivers can sense a change in handling characteristics of the car when structures are within 30-feet.
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