Luis Martins

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About Luis Martins

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    Senior Member
  • Birthday 08/22/1972

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    Acoustics, music composing, plasma gasification

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  1. Luis Martins

    Sycamore cello neck

    We have lots of Platanus here in Portugal. The major differences I've seen when compared to Pseudoplatanus are larger rays and pores. Maybe due to the warmer climate, and of course, being of a different genus. Looks great in turned pieces. Density and color similar to Pseudoplatanus, but oxidizes faster to a more yellow tone. The larger pores, in my opinion, are the main problem, but otherwise should work just fine. A wedge I've got here:
  2. Luis Martins

    Old school peg turner!

    It was nice to see an ancient wood turner actually working. And it wasn't has hard as it seems. Anyway, just a curiosity.
  3. Luis Martins

    Old school peg turner!

  4. Luis Martins

    12-20K Viola Suggestions

    @MANFIO Workshop is a lot further away.... And probably has a waiting list of some years.... And might sell for over 20K..... But I'm sure he can correct me if I'm wrong.
  5. Luis Martins

    Researching information on super light violins

    @Andreas Preuss Just a reminder. The shape and size (area) of the f holes are as important as is the internal volume, and work in conjunction to tune the resonator. The shape and position of the f holes also contribute to free up the central portion of the top plate and allow it to act more or less as a piston pivoted by the sound post. In sum, changing the air volume can be corrected with f holes size, but that will change the "pistonic" pivot behavior of the top plate at other frequencies. There are other tuning methods, like resistive elements placed on the openings to lower the resonance (usually textile fabric), or absorbent material inside the resonance cavity that create an apparent increase in volume, thus lowering the resonance, but all add weight and have dampening effects...
  6. Luis Martins

    Don Noon's bench

    Beautiful crackling!
  7. Luis Martins

    Happy Easter

    Happy Easter!
  8. Luis Martins

    Researching information on super light violins

    @Don Noon your "olé toro" looks amazing!!!
  9. Luis Martins

    Researching information on super light violins

    @Marty Kasprzyk thank you for the input, I'll see if I can find info on that viola! @Andreas Preuss just trying to help in any way I can. So many here do that so unselfishly that I have no other choice then following the example. And as you've said before, lots of minute changes add up to a significant result.
  10. Luis Martins

    Researching information on super light violins

    @Andreas Preuss Since you've mentioned assimetry, and while thinking about directivity, maybe tapering the instrument body slightly towards the audience might help too. This principle has been used in wideband pro audio speaker systems for a long time with a lot better results than the typical arrays. The improvement is quite noticeable in directivity, efficiency and overall audio quality perception. Most not all that has been suggested, like higher stiffness to weight ratio, hollowing the blocks, assimetry, etc, if we'll balanced and done conservatively might be the way to reduce the weight in a noticeable way without compromising performance and esthetics.
  11. Luis Martins

    Researching information on super light violins

    @Don Noon tests with "bass reflex"?
  12. Luis Martins

    The Top 3 Beginner Mistakes

    great answer! So, in my opinion regarding some of the replys to the op: 1) Not enough research 2) Not learning from your mistakes 3) Quit before getting it right
  13. Luis Martins

    The Top 3 Beginner Mistakes

    Let´s assume 1740s period. Cannone vs Sauret vs Leduc scrolls entering vma competition as if no one ever heard of DG. Master work or rookie mistakes? And why.
  14. Luis Martins

    The Top 3 Beginner Mistakes

    I wonder how Guarneri DG would come out after posting his work here in Maestronet ...