• Patina is important, and a turbulent airflow remains attached for longer than a laminar one - scratched bottles are faster.

  • What you really want is a scratched bottle underneath the downtube to generate turbulent flow, with a smooth one behind to pick up the flow.

  • What you really want is a scratched bottle underneath the downtube to generate turbulent flow, with a smooth one behind to pick up the flow.

    That doesn't sound right, but I don't know enough about aerodynamics to dispute it.

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