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In essence, the area rule is a general rule of aircraft design which prohibits abrupt changes in a aircraft's cross-sectional area from one point to another on it's longitudinal axis, since these would create areas of low pressure in the surrounding airflow that would literally hold the aircraft back, reducing it's speed through form dragform drag. The area rule is sometimes referred to as the "supersonic area rule" since it has more significance at transonic and supersonic speeds.

In essence, the area rule is a general rule of aircraft design which prohibits abrupt changes in a aircraft's cross-sectional area from one point to another on it's longitudinal axis, since these would create areas of low pressure in the surrounding airflow that would literally hold the aircraft back, reducing it's speed through form drag.

In essence, the area rule is a general rule of aircraft design which prohibits abrupt changes in a aircraft's cross-sectional area from one point to another on it's longitudinal axis, since these would create areas of low pressure in the surrounding airflow that would literally hold the aircraft back, reducing it's speed through form drag. The area rule is sometimes referred to as the "supersonic area rule" since it has more significance at transonic and supersonic speeds.

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In essence, the area rule is a general rule of aircraft design which prohibits abrupt changes in a aircraft's cross-sectional area from one point to another on it's longitudinal axis, since these would create areas of low pressure in the surrounding airflow that would literally hold the aircraft back, reducing it's speed through form drag.