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Once a location (usually a station, but not always) has been pegged it is possible to perform a rotational movement around it, as if it was the centre of a circle or spiral. As most moves in Mornington Crescent are linear, a well-timed pivot can get round obstacles that could not be circumvented in any other way. When performing such a manoeuver, it pays to pay close attention to line velocity and the current level of helical stress; if either is excessive, the pivot manoeuver may fail badly. A Crossmead Spiral or Pettengale Sweep is a (usually) safer methor to approximate a pivot using standard linear rather than rotational moves, and the hazards of incorrectly executing a Crossmead Spiral are already well-documented.


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Edited March 29, 2007 12:01 am by Simons Mith (diff)