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ext_12904 (
eub.livejournal.com
) wrote
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eub
2010-08-03 05:29 am (UTC)
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Wikipedia mutters about "aids in accelerating the upward convective air flow" but I don't get it.
Oh, their venturi article does mention an hourglass shape to reduce drag (impedance-matching at the ends?), which would make sense.
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no subject
Oh, their venturi article does mention an hourglass shape to reduce drag (impedance-matching at the ends?), which would make sense.