Patent Number: 6,167,627

Title: Aeronautical holding pattern calculator

Abstract: A device for computing the heading of an airplane in the outbound leg of a holding pattern, and the bearing to a VOR or NDB station at which the airplane should begin turning inbound at the end of the outbound leg, given the bearing of the outbound leg, the speed and bearing of the wind, and the true airspeed of the plane, but without requiring the user to keep track of the time. In a first preferred embodiment, the invention comprises a slide rule with upper, middle and lower disks attached at their centers by a pivot, and a straight rule movably retained in a groove in an upper disk. There is a logarithmic scale for true airspeed on the straight rule, and a parallel and adjacent logarithmic scale for wind speed on the upper disk. The lower and middle disks each have degree markings, and the middle disk also has figures for heading and bearing corrections, to which arrows on the straight rule point. In a second preferred embodiment, the invention comprises a digital electronic device programmed to make equivalent computations. The user is prompted to enter the given values. Heading and bearing corrections are retrieved from tables stored in memory, and used to compute the proper heading during the outbound leg and the bearing to the station at which to turn.

Inventors: Wilder; Bruce Gary (Manassas, VA), Wilke; Otto Charles (Waco, TX)


International Classification: G01C 21/20 (20060101); G06G 1/00 (20060101); G01C 021/20 ()

Expiration Date: 01/02/2018