Sheet bracing vs.. not sheet bracing

Discussion in 'Trumpet Discussion' started by Outkastah, Aug 26, 2010.

  1. Outkastah

    Outkastah Pianissimo User

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    Aug 29, 2009
    Boston
    Ok, I was just wondering besides adding weight to the horn... what does adding sheet bracing in the crooks of the tuneing slide and bell actually do? or suppossed to do? Does it make the tone darker, brighter? :shock:

    Thanks everyone!
    - Justin
     
  2. rowuk

    rowuk Moderator Staff Member

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    Sheet bracing changes the way the bell resonates. For conventional tempered bells like Bach that were not designed with bracing like this in mind, it can make it much more difficult for the player to hear themselves, the tone will get brighter and less controllable and if there are any intonation issues, they will be harder to compensate.

    Sheet bracing has to be part of a total concept in trumpet design. It is not something that because Monette uses it, that can be transplanted to another type of horn. Please note that ALL of Dave Monettes recent inventions have been without sheet bracing. Only his 2 top of the line instruments use this. The bells on those horns are not even brass if I remember correctly!
     
  3. Outkastah

    Outkastah Pianissimo User

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    Aug 29, 2009
    Boston
    Oh cool, thanks Rowuk!
     
  4. gzent

    gzent Fortissimo User

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    Sheet bracing can make a horn more efficient depending on where it is attached to the
    horn. It does this by significantly increasing what is known as the acoustic impedance of the horn in the vicinity of the brace. Hence, more energy of the vibrating column of air inside the horn escapes the bell rather than through sympathetic vibration of various horn components.

    FYI - the bell bow and tuning slide are not affected greatly by sheet bracing since they are already complex structures and more resistant to vibration than straight structures like the leadpipe or the bell (mostly straight).

    More effective locations are the leadpipe to valve block area and bell to valve block area.

    Greg
     

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