Flue pipe

Organ pipe without moving parts Four flue pipes of a diapason rank. Wooden flue pipes A flue pipe (also referred to as a labial pipe) is an organ pipe that produces sound through the vibration of air molecules, in the same manner as a recorder or a whistle, in a pipe organ. Air under pressure (called wind) is driven through a flue and against a sharp lip called a labium, causing the column of air in the pipe to resonate at a frequency determined by the pipe length (see wind instrument). Thus, there are no moving parts in a flue pipe. This is in contrast to reed pipes, whose sound is driven by beating reeds, as in a clarinet. Stop Flue pipes include all stops of the Principal, Flute, and String classes, and some stops from the Hybrid class. Construction Longitudinal section of a typical flue pipe mouth and foot. 1. Pipe body or resonator 2. Upper lip 3. Languid 4. Lower lip 5. Foot 6. Toe hole Flue pipes may be metallic or wooden. Metal pipes are usually circular in cross section; wooden pipes are usually square or rectangular, though triangular and round wooden pipes do exist. A flue pipe has two major parts, a foot and a resonator. The foot is the bottom portion of the pipe, usual