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Don't be put off by that aluminum extruded airfoil section. A flat plate will get 80+%, the significant factor is the converging duct, with exit maybe 2/3 the area of the entrance. Too much and it would choke off the airflow.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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