Midi Number
The pitch of the pipe, specified as a MIDI note number, where 60 is Middle C (261.6 Hz), and incrementing by one always raises the pitch by one semitone.
Is Closed
False indicates the end of the pipe will be open to the environment, true means it will be closed, or stopped. This affects the length of the pipe, and it more subtly affects the width, mouth height, and windsheet thickness.
Plywood Thickness
The thickness of the plywood you are going to use for the top part (resonator) or the pipe. This also determines the wall thickness of the 3d printed part.
Felt Thickness
The thickness of the felt you are going to use to line the inside of the plywood tuning slide.
Stem Length
The length of the stem that lets air into the bottom of the pipe. This does not affect the sound of the pipe.
Tuning Headroom
The pipe will be shortened by this many half-steps so that it can be tuned down to the correct value by lengthening. Normally a stopped pipe would be tuned up by shortening the pipe, but because of the restrictions of laser-cutting, here we take the approach of tuning all pipes by attaching an open or closed slide to the outside of the pipe. If you need your pipe to be too long so it can be stopped with the traditional method, you can enter a negative number here.
Kerf
Width of the kerf of the laser (or router) used to cut the plywood.
Normalmensur Deviation
This makes the pipe wider or narrower than it 'should' be. Positive values make the pipe narrower, negative wider. Should range from about -10 to 10, with negative numbers having a more string-like sound, and positive having a more flute-like sound, and values near 0 are for principals. +4 means this pipe will be as wide as a pipe 4 semitones higher should be. This page uses a 17
th halving ratio.
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Ising's Number
This number, together with the air pressure, determines the wind-sheet thickenss of the pipe. 2 will give the pipe maximum efficiency and bring out the fundamental tone. Increasing it will bring out the higher harmonics, and above 3 the pipe will be overblown.
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Air Pressure
The air pressure, above atmospheric pressure, of the pipe's air supply. Used in determining the windsheet thickness. (See Ising's Number, above.)