Scheffé's method

At the pivotal altitude, a turn can be made at any distance from the pylon with appropriate bank, and the pylon will appear to remain stationary

Pivotal altitude is the altitude for a given ground speed at which the line of sight from the cockpit directly parallel to the lateral axis of the aircraft will remain stationary on an object on the ground.

A rule of thumb for calculating the pivotal altitude H in feet, given the speed in knots $v$, is

$H={\frac {v^{2}}{11.3}}$

References

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