Are the pipe measurements critical ?
A. Generally speaking the pipe measurements are NOT critical. However you should try and make the pipes reasonably “square” and get the outside width of the pipe about right. The width is important because when the 17 pipes are laid side to side they have to fit in a space 14 3/4 in. wide. You will almost certainly have to sand a small amount from the sides of each pipe to get them to fit between the end panels. TIP. Don’t forget to make all pipes 5% longer than specified to allow for tuning. You can always cut some off after tuning but you cannot add length. It is principally the effective length of the pipe which determines the note that it sounds. Q. Why is the drawing of the Bb pipe longer than 7 3/4in. ? A. I suspect that JS has added the 5% to the pipe.
