ChooChooMike
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Whistle
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Help Support Home Model Engine Machinist Forum:
G'day Kevin et al.
Two ideas that do have merit. One the Helmholtz resonator, the other the chime whistle.
At beer o'clock in an office yesterday I finished my stubby of beer and was walking with it back to the kitchen. As I did so I was swinging my arms and became aware of the low note produced as the wind passed over the lip of the bottle. Try blowing over the lip of a soft drink bottle if you are not a beer drinker.
A stubby bottle produces a low note, guess two octaves below middle C corresponding to stopped whistle about 1.2 metres long, and yet the stubby is only 200mm long with volume of 375ml.
Solution: drink a stubby bottle of beer (and a few more just in case the bottle breaks, you need spares ;D ). Attach bottle to loco and then blow steam across the lip.
The chime whistle is a concept that the English readers may not know. A chime whistle comprises a bell divided into about 5 chambers by axial dividers, each chamber is a separate length. The annular steam jet is much the same as for a bell whistle and blows across the lip of each chamber. Because the chambers are different lengths the notes produced are different. The resulting sound is a chord (dischord) which you hear due to acoustic interference as a much lower note.
Making a chime whistle seems like too much work, I like the stubby idea better!
OGTDA
Regards,
Ian
Two ideas that do have merit. One the Helmholtz resonator, the other the chime whistle.
At beer o'clock in an office yesterday I finished my stubby of beer and was walking with it back to the kitchen. As I did so I was swinging my arms and became aware of the low note produced as the wind passed over the lip of the bottle. Try blowing over the lip of a soft drink bottle if you are not a beer drinker.
A stubby bottle produces a low note, guess two octaves below middle C corresponding to stopped whistle about 1.2 metres long, and yet the stubby is only 200mm long with volume of 375ml.
Solution: drink a stubby bottle of beer (and a few more just in case the bottle breaks, you need spares ;D ). Attach bottle to loco and then blow steam across the lip.
The chime whistle is a concept that the English readers may not know. A chime whistle comprises a bell divided into about 5 chambers by axial dividers, each chamber is a separate length. The annular steam jet is much the same as for a bell whistle and blows across the lip of each chamber. Because the chambers are different lengths the notes produced are different. The resulting sound is a chord (dischord) which you hear due to acoustic interference as a much lower note.
Making a chime whistle seems like too much work, I like the stubby idea better!
OGTDA
Regards,
Ian
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HI
In a scale model the easiest way to make a chime whistle is to use say three smaller whistle pipes hidden in a larger outer pipe. I have seen a couple of whistles made this way but the tunning was im told a nightmare. Theres a company here that sells a scale chime for locos that has the chambers exposed, it looks very nice as you can see in the link.
http://www.maccmodels.co.uk/steamf12.jpg
I have a set of drawings in PDF for a steam siren thats not easy to make but does scale well all the way down to 1 inch to the foot. I have no idea who drew the drawings or how I got them. If its possible to post PDF on here let me know and il put them up.
Cheers kevin
In a scale model the easiest way to make a chime whistle is to use say three smaller whistle pipes hidden in a larger outer pipe. I have seen a couple of whistles made this way but the tunning was im told a nightmare. Theres a company here that sells a scale chime for locos that has the chambers exposed, it looks very nice as you can see in the link.
http://www.maccmodels.co.uk/steamf12.jpg
I have a set of drawings in PDF for a steam siren thats not easy to make but does scale well all the way down to 1 inch to the foot. I have no idea who drew the drawings or how I got them. If its possible to post PDF on here let me know and il put them up.
Cheers kevin
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