Stumac's Research Project

Discussion in 'Trumpet Discussion' started by Sethoflagos, Mar 30, 2015.

  1. Sethoflagos

    Sethoflagos Utimate User

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    I'm sure that many of us would be very interested in participating in this research. But I don't suppose many have ready access to a Penwalt precision gauge or similar. But it's easy enough to rig up a basic water manometer to make the same measurements with a reasonable degree of accuracy.

    [​IMG]


    All it is is 10 meters of 0.3" clear plastic tube slung over a curtain rail with a bit of food-dyed water in it. To get it into the corner of my mouth while still being able to play a clean note, the rubber teat off an eye dropper works perfectly. Readings are simply the difference in water levels in the two legs of the tube loop for each pitch.

    My readings were taken on the Yamaha 6335HS II with Wick 2W mouthpiece.

    C3 - 5.1" WG
    G4 - 8.0" WG
    C4 - 11.4" WG
    E5 - 14.0" WG
    G5 - 17.7" WG
    C5 - 21.1" WG

    I'll see if there's any difference with my other instruments tomorrow. Let's put some numbers on 'stuffy'!
     
  2. BigDub

    BigDub Fortissimo User

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    Analyze;analyze |ˈanlˌīz| ( Brit. analyse)
    verb [ trans. ]
    examine methodically and in detail the constitution or structure of (something, esp. information), typically for purposes of explanation and interpretation : we need to analyze our results more clearly.
    • discover or reveal (something) through such examination : I intend to analyze the sexism in such texts | [with clause ] he tried to analyze exactly what was going on.
    • psychoanalyze (someone).
    • identify and measure the chemical constituents of (a substance or specimen).
    • Grammar resolve (a sentence) into its grammatical elements; parse.

    You guys sure put the 'anal' into "[B]analyze"
     
  3. Vulgano Brother

    Vulgano Brother Moderator Staff Member

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    Hey Big Dub, that is how real scientists work!
     
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  4. Sethoflagos

    Sethoflagos Utimate User

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    Without I hope being too 'anal' about it I wondered what a graph of lung pressure vs frequency would look like. And it looks like this:

    [​IMG]

    ...which to my jaded eyes looks very much like a straight line through the origin, with maybe a suggestion that I should recheck top of stave G. Engineers like graphs like this. They suggest a really simple correlation.
     
  5. Dr.Mark

    Dr.Mark Mezzo Forte User

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    Hi stumac,
    Correct me if I'm wrong, but it appears from what you've done that blow pressure (air mass) and volume are positively correlated, right? and at a particular pitch more pressure doesn't change the pitch, it just makes the sound softer or louder. Interestingly, the higher you go, the higher the pressure is needed for that particular note.
    I like it!! Now that's serious thinking. It's impressive (and in my opinion shows real intelligence)when someone uses their head and what's lying around the house to discover how something works.
    Bravo!
    Dr.Mark
     
  6. Sethoflagos

    Sethoflagos Utimate User

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    Thank-you, on behalf of Stumac, Dr Mark ;-)

    Except we haven't got onto volume yet: it's blow pressure at minimum sustainable volume. It'll likely be different for different folks.
     
  7. mchs3d

    mchs3d Mezzo Forte User

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    So...it sounds like the higher the pitch, the higher the pressure? I could've told you that!
     
  8. Peter McNeill

    Peter McNeill Utimate User

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    Hey Seth,
    On that graph, are you sure it is the High C, it may the Bb below it played open. That will give the drop off on the final plot.
     
  9. Sethoflagos

    Sethoflagos Utimate User

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    Peter. If you weren't such a good friend I could take that comment as an insult. I do know my octave from minor 7th! ;-)
     
  10. Sethoflagos

    Sethoflagos Utimate User

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    Yeah, but you didn't come up with the numbers, mchs3d! A theory without numbers ain't worth Jack **** is it? ;-)
     

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