The Unofficial Mamod and Other Steam Forum The Original Unofficial Toy Steam Forum Established 2006 The biggest, most popular global steam forum around! Accept NO imitations! We have a growing community of regular posting members who chat about all aspects of toy and model steam.
Posted: Mon Oct 19, 2009 10:39 am Post subject: More whistles
I'm normally not so fond of high pitch whistles so I decided to pestering my neighbors( I live in a flat) with a lower pitch one :
The piping on the boiler is a somewhat improvised, will make a proper whistle valve with a rope or chain to pull. The steam pressure could also be a little higher I guess(and drier - another coil of super heated pipe) to make it sound better.
C.
Edit: The measurements is 10 mm brass pipe plus ~1 inch of 22 mm diameter copper pipe, total height 90 mm.
this is very interesting. i like the design i never thought of adding a bigger top. im very curious to know if the the two tone was caused by the valve or wether its the whistle.????? seeing that i need to make 12 for lizs calliope your experiment couldnt have come at a better time for me. thankyou very much. _________________ difficult things done straight away...the impossible takes me a little longer
Caprice, I love the tone and the ramp up/down as you turn the valve. Different and nice! _________________ Visit IndianaRog and The Temple of Steam: www.indianarog.com
xlchainsaw, Is there two tones? Haven't even thought about that. I'm just a whistle newbie? This is the first whistle I made so I have nothing to compare with...
If so, I have have no idea why, could be a soldering blob in the "passage" to the whistle opening or something else.
The bigger top(called a Helmholtz resonator) make it possible to have a shorter whistle with a lower pitch:
Here's where I got the idea:
Quote:
Helmholtz Whistle – a whistle with a cross-sectional area exceeding that of the whistle bell opening, often shaped like a bottle or incandescent light bulb. The frequency of this whistle relative to its size is lower than that of a conventional whistle and therefore these whistles have found application in small gauge steam locomotives. Also termed a Bangham whistle.
thanks for that. i will make one tomorrow it wont take long and i will put it on a steam valve with a quick on and off to check if its a two tone. it really sounds great. thanks for the link . if its ok with you i will see if i can post a vid under your post for cross reference. i have the materials all set to go and was about to start . to get a low c note the whistle needs to be ten inches long. your method might help reduce this or even!!!!! have a better tone! _________________ difficult things done straight away...the impossible takes me a little longer
xlchainsaw, no problem post as much as you like! And thanks for the kind words.
One thing I remember when building it was that moving the bigger pipe up and down on the smaller one didn't lower the tone much but that's perhaps kind of obvious? Finding the balance between the length of both pipes sound-wise could be a little bit tricky I guess.
thanks for that. we have an electronic tuner which identifies the note. its all trial and error. _________________ difficult things done straight away...the impossible takes me a little longer
Thanks Les!
----------------
BTW, regarding the "two tone" frequencies discussion above, I should have read my own links better:
Quote:
Frequency increases with blowing pressure, which determines gas volume flow through the whistle, allowing a locomotive engineer to play a whistle like a musical instrument, using the valve to vary the flow of steam...
I think that's what change the tone here, no "soldering blob".
(As IndianaRog also mentioned, sorry I missed that, was very tired earlier.)
----------------
xlchainsaw, A electronic tuner...I see...that must be easier than putting the steam plant on the piano.
what a fun whistle!! a big thankyou to caprice. as stated i made one today so here it is.
here she blows!!!! operated by a lever valve.
with a spring valve.
a very fun whistle. on air its two tone! how its opened on air also plays different. it also hums and vibrates in the hand!!! but on steam!!!!!!! btw it blows a low b. _________________ difficult things done straight away...the impossible takes me a little longer
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
Welcome to The Unofficial Mamod & Other Steam Forum!
Welcome. We're a friendly place to share knowledge & chat about this great hobby. Since our July 06 startup, we have grown to over 500 members, who have posted over a four hundred thousand posts. We can answer most toy steam questions, basic or complex. Our multi-national members enjoy sharing photos & videos of engines by Mamod, Wilesco, Jensen, Bowman, SEL, Doll, Bing, Scorpion, Renown & more. All collectors are welcome & if you are just starting out in the hobby, we can suggest some ideal engines. Our forum is ad free & costs nothing to be a member.
Press the 'Join' button at the top of the page, to be part of the largest toy steam forum on the internet.
Questions? Email the forum's Administrator: Chantry_James at yahoo.co.uk
Engine of the Month December Rob's
Accucraft "Ruby" Locomotive Kit 2008 / 2009
Click picture to enlarge
:
I'm just a whistle newbie? This is the first whistle I made so I have nothing to compare with...
)