WHS.hans wrote:I made changes to the Flutomat formulas calculating the lengths for window and end of the tube corrections, so the calculated whistle model fits better with real whistles. The end correction factor is increased (I use 0.5*bore, not 0.3*bore), which affects all hole locations, making them smaller by the same amount (less distance measured from the foot end). The window or embouchure correction is a very difficult one, as it is quite a large value. It only affects the window/embouchure position, i.e its distance from the foot end. If you use a slide, errors can usually be compensated. This window correction depends on the size (width/length) of the window, but also on its depth(wall height at the window), and perhaps some other factors.
Phill picked up my suggestions and created with it the 'HB Flutomat' algorythm of TWJCalc.
Hans is spending a lot of time fine tuning the approximations used in these calculations - he is the expert. My role is simply to provide a way for people to use these algorithms. Hans has made changes to his algorithm since 2.02, and these will be incorporated in 2.03, due soon.
