The problem is that the traditional flute has six holes (even the flute has only eight holes at most), and five holes can't be opened. Opening another hole under one hole will obviously affect the frequency of the hole. Therefore, in practice, the ratio of six-hole flute to flute has been effectively adjusted.
0.84 for one hole, 0.74 for two holes, 0.69 for three holes, 0.59 for four holes, 0.5 1 for five holes and 0.44 for six holes.
Extended data
If the pitch reference distance of F flute is 57cm, then the reference distance of a hole is 57 times 0.84 equal to 47.9cm (measured from the mouthpiece); The distance between the two holes is 57 times 0.74 and 42.2cm；; The distance between the three holes is 57 times 0.69 and 39.3cm；; The distance between the four holes is 57 times 0.59 and 33.6cm；; The distance between five holes is 57 times of 0.5 1 and 29.1cm; ; The distance of six holes is 57 times 0.44,25.1cm; ; Because it is a reference position, it does not need to be calculated to two decimal places.
It should be noted that if the diameter is too large, the upper grip (especially the sixth hole) will be low, and if the diameter is too small, the upper grip will be high. At this time, it is necessary to use the method of "lifting" by experience to correct it. The "dicing board" for making flutes in Shanghai, Suzhou and Tongling Bridges is made by using the principle of proportion, which is very effective in production.