| 摘要 |
A circular disk type calculator for determining the proper approach speed for a particular aircraft within a specified range of gross weights and flap settings. The calculator includes three superposed circular disks pivoted for independent rotation about their centers. A third lower disk is imprinted with appropriate speed and weight information. A second intermediate disk includes cut-outs and windows to expose certain readings on the lower disk and also includes a flap setting marker extending outwardly from its outer edge. A first upper disk is provided with appropriate windows and markings relating to the other disks thereby indicating the desired information including pattern and threshold air speed for the gross weight and flap setting of the aircraft.
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