Whistle Style

What is responsible for land in different lengths of pipe?

I make a PVC pipe organ with a friend, and I'm in a strange situation. We use a whistle-style dress and pack-opening to create sound (like a recorder). Our mid-tone C is a piece of 3 / 4 "diameter PVC interior 12.5 "long. However, when we double the length of pipe, with the intention to abandon the field and octave, pitch increases by about one fifth perfect. Similarly, when we cut a piece of 6.25 "to rise and the octave, the terrain descends about a 4th or 5th. What could cause this to happen? In everything I've ever read, more pipes to lower grades. All the pipes are well diameter, 3 / 4 "inside.

You're probably not the fundamental mode of resonance of vibrations in organ pipes more. Wherever you read is correct, if you can the fundamental mode resonance. Otherwise, you sound the higher harmonics of the pipe instead of the fundamental mode and you hear a sound more.

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