Chiff and Fipple Forums

TWCalc - Tin Whistle Hole Calculator has been revised to fix a glitch in the L/B Ratio calculation. Other minor improvements as well.

Version 3.31 can be downloaded here: http://kingsmills.us/twcalc/twcalc.htm

... than calculators come up with. The variations in Fipple design throws a wrench at a lot of calculations. Once you trim the body note into tune, TWCalc and other programs mentioned (I wrote TWCalc) will find the drilling centers of the holes for you. Hole measurements are taken from the bottom ...

I have the TWCalc source code available as well. I call it "Open Source Whistlemaking". On the cutoff graph, I found the use of a "Cutoff Ratio": Cutoff / Frequency a good way to determine the quality of the ...

I may take a look at it and see if I can put some of this into TWCalc. Nice thing about the C language code is that the interative functions can run longer instead of a fixed set that the spreadsheet does. How does your embouchure hole/window formula come ...

I've made some modifications to TWCalc, Tin Whistle Tonehole Calculator Version 3.2 for Windows You can download it here: http://www.tinwhistles.us/twcalc.htm A link to the Instructions are there as well. You can also download it from this ...

http://www.kingsmills.us/flute-diatonic.xls

Actually, I have a new spreadsheet that is more accurate than TWCALC. I will be updating TWCALC shortly.

... program considers the bore diameter information and the toneholes. I make a lot of unusual keys that go beyond the simple percent formula. Also, TWCalc and the new spreadsheet have Cutoff Frequency / Frequency Ratio information to help predict the quality of the tone. To answer the earlier question, ...

... for easy reference. I've had some nice comments on the improved tuning from various customers. When I get time, all these changes will go into TWCalc. Send me private message or email and I'll send you the Excel sheet. If you don't have Excel, you can open it using OpenOffice, a free product ...

You can get brass tubing from specialshapes.com or a local Hobbytown store. And yes, the TWCALC program will do a six hole verision of the Ahava Rabba mode. However, it is better to have that mode in seven holes simply because a lot of Jewish music (and Arabic as well) ...

... as other sheets do and the high notes are not too sharp. After these new formulas are tested more and proved, they will eventually be put into TWCALC. http://www.kingsmills.us/flute-new.xls

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Yes, TWCalc is for very dangerous people. I have a whistle and I'm afraid to use it.

The TWCalc program is a windows program and it is zipped. You have to unzip it first.

... correction result to this whistles calculate-cork-to-end length to get the true length. This also works on flutes. BTW - The Cork to end length in TWCalc is more suited to tinwhistles, on flutes this will throw you off.

Some time ago, I wrote a program called, "TWCalc" - A program for calculating tonehole positions for tinwhistles. After many requests, I have written a manual for using it. The manual is at: http://www.tinwhistles.us/twmanual.htm TWCalc ...

I'll sit down and write some simple instructions for TWCalc. One thing to pay attention to is the cutoff frequencies, Keep them close together, no extremes and the whistle should sound well. If you don't observe the cutoffs, you'll get certain toneholes ...