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silent whistle

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Peter Russell 421/09/2019 12:53:36
60 forum posts
1 photos

Can any one help/advise.

Im trying to fit a whistle - bell type to a steam loco - on air its ok.

On steam its a wet dribble.

The pipe from the valve to the whistle is lagged, the steam supply is from the header manifold which is fed from a dome.

Are there any whistles that are tollerant of wet steam?

Regards

Pete

Michael Gilligan21/09/2019 13:57:31
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14011 forum posts
608 photos

blush My misunderstanding ...

i looked at the thead title and thought you wanted something that only your dog [or bat] could hear.

For my pennance, however, I have found this: **LINK**

http://www.giangrandi.ch/mechanics/steamwhistle/steamwhistle.shtml

... which incluses the potentially useful observation: "Instead of steam I decided to use compressed air which is easier to find at home. But this whistle will work fine also with steam, if you are lucky enough to have a boiler. Just keep in mind that steam has a lower density than air and will produce a higher pitch."

MichaelG.

Howard Lewis21/09/2019 15:33:14
2337 forum posts
2 photos

You may be able to obtain the note that you want by adjusting the position of the bell, relative to the platform at the bottom of the whistle body, probably downwards towards the platform. ( The adjustment may need to be done to cover lower steam pressures, resulting in a higher pitch with higher pressures )

This may accommodate the different characteristics of steam, as opposed to compressed air.

DO let us know how you get on.

Howard

Clive Foster21/09/2019 16:01:01
1840 forum posts
59 photos

Guy Lautard's Machinist's Bedside Reader Volume 2 has plans for a steam whistle including notes on tuning for air or steam. Said to be effective and very loud. Vol.II Page 134. A Replica Lunkenheimer Steam Whistle.

Some potentially useful links here :- **LINK** and here:- **LINK**

Google will find plenty of other hits too.

Clive

duncan webster21/09/2019 18:26:47
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2232 forum posts
32 photos

Bob Bramson did an article in ME some time ago, looks very similar to MG's link. I've made one to Bob's recipe, it works

John Purdy21/09/2019 19:22:42
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178 forum posts
59 photos

Pete

The article in ME by Bob Branmson was in Vol. 205 2010 #4289. There was also another by Peter Olds in the 4 Jun 1982 issue, Vol. 148 #3682. I made my whistle for my 5" "Gemma" to the design of the smaller one in Peter's article and it works well on both air and steam. It is fed off the side of the dome and runs totally dry producing a high pitched sound in the neighborhood of around 2500-3000 Hz. I have both articles if you are interested.

John

John Purdy21/09/2019 19:58:20
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178 forum posts
59 photos

Pete

I forgot to say the one I made is a bell type and is quite small. The bell is 1/2" dia by 3/4" long with an overall height of about 1 5/8".

John

Howard Lewis23/09/2019 14:35:12
2337 forum posts
2 photos

Being small, it is likely to produce a note with a high frequency. I hope that the note is not so high that it is beyond the upper limit of the human ear, and so inaudible to us! If so, it will be a dog whistle!

Anyone like to use the dimensions to calculate what the frequency is likely to be?

Howard

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