Organ flue pipe scaling

Relationship between number of feet, octave and size of an open flue pipe (1′ = 1 foot = about 32 cm) Playⓘ

Scaling is the ratio of an organ pipe's diameter to its length. The scaling of a pipe is a major influence on its timbre. Reed pipes are scaled according to different formulas than for flue pipes. In general, the larger the diameter of a given pipe at a given pitch, the fuller and more fundamental the sound becomes.