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In view of all this is that all of these factors, tubing diameter, fipple design, tonehole placement, cutoff freqency are all interrelated. If a smaller diameter tubing had been used to bring up the Length/bore ratio, this would raise the general cutoff frequency and the fipple voicing would also be less picky. In order for it to even sound well, the fipple would be very sensitive for being properly voiced. The result, is an instrument that works but it is borderline with performance. However, the tone could be somewhat lacking in harmonics. If the cut-off frequency on the tone holes exceeds 1761.99 Hz, then we're in. A high-D is a base frequency of 587.33 Hz, the highest note of this instrument would thus be 1761.99 Hz or the base frequency times three. If you apply Peter Hoekje Spreadsheet to the holes on the instrument, you will get cut-off frequencies between 2000 through 2600 Hz depending on the tone hole placement. This tells us that tubing is a little too wide and it could causes weakness of lack of notes in the second register. High-D Whistle with 1/2 inch ((0.60" ID) PVC Schedule 40 Pipe: 17.57Īs you can see, I have a small whistle listed with an L/B ratio of 17.57.
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Low-D Tin Whistle with 3/4 inch (0.80" ID) Copper Pipe: 26.8 The basic Generation sound remains the same. It has that coveted Generation sound, with it’s beloved chiff, but it plays well and easily. Low-D Whistle with 3/4 inch (0.82" ID) PVC Schedule 40 Pipe: 25.5 This whistle has been tweaked (the traditional term for fine tuning a whistle) by Jerry Freeman to create as close as possible to an ideal Generation. L/B ratios can be used with the metric system as well. Note: Musical length is defined as the distance from the tubing wall in the fipple section down to the bottom of the instrument. To obtain number: L/B = Bore Size / Musical Length Typical Length to Bore Ratios can run from 20:1 to about 34:1. NOTE: By comparison, LOW-D Tin Whistles are small compared to many of the Renaissance Bass Instruments. The L/B ratio is comparison of the length of the tube from the fipple to the end of the tube.Īlthough, the L/B ratio has a few problems with it, (Note - you see these problems when you make huge instruments like Contrabass Recorders (Tone column of 101 inches) and the like) Normally these problems are miniscule for making small instruments such as Tin Whistles. In his writings, he discussed the Length to bore ratio. Many years ago, a man by the name of Theobald Boehm designed the modern transverse flute. Air friction, pipe restriction, air velocity are some of the many factors involved in this choice.
![chiff and fipple b flat whistle chiff and fipple b flat whistle](https://www.kwela.co.uk/wp-content/dolos.gif)
In designing Tin Whistles, Penny Whistles there are limitations on choosing the tube diameters depending on the size of the instrument which you are building.