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description: TBD
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# Tunnel performance

## Wind speed

The maximum observed wind speed is on the order of 17 m/s (38mph).

The fan control panel's speed control dial maps to wind speed roughly as follows:

**TBD**

Note from the above data that the speed control dial is highly non-linear and has significant dead-band. It is also an "open loop" system in that no feedback is employed by the motor drive controller, so the exact setting should be dialed in on each run.

