Yairi GF 350 - additional harmonic bar (Full Version)

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mango -> Yairi GF 350 - additional harmonic bar (May 18 2020 23:01:44)

I have this old 1987 Japanese Flamenca from K.Yairi. Model GF 350. Cedar Top. Some kind of cypress back and sides (laminated?). It is the loudest guitar I ever heard. Well of course the cedar top does its job, but I think this strange "third harmonic bar" could also play a role. What do you think?

Another question: There is a broken back strut. But I have no idea how I could clamp it to repair. Any ideas?

greets, Jonas









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ernandez R -> RE: Yairi GF 350 - additional harmonic bar (May 19 2020 2:57:26)

Jonas,

Easy peasy. Make a short stick with a saddle of sorts to fit over the split bottom brace and the other end shaped to fit over the corresponding top brace. Length fit so as to be tight enough to force the crack closed as you align the stick mostly vertical. Think of it as a mini go deck stick.

I'm thinking water thin CA would be the easiest but you could preheat the area with heat lamps and what ever, then dab some HHG in there before clamping it up, and wiping off the squeeze out. Slow epoxy would work just as well as would one of the TB products.

But what if the cracked brace was responsible for her increadble volume?!! Ok ok, the pain meds I'm on have me a little loopy ;)


HR



JasonM -> RE: Yairi GF 350 - additional harmonic bar (May 19 2020 16:14:56)

Something like Ernandez is talking about:
https://www.stewmac.com/luthier-tools-and-supplies/types-of-tools/clamps/stewmac-brace-repair-jack.html



mango -> RE: Yairi GF 350 - additional harmonic bar (May 19 2020 16:25:09)

Ah cool! Yes, very easy actually :-)
Anybody saw a bracing with that "third harmonic bar" before?



dartemo1 -> RE: Yairi GF 350 - additional harmonic bar (May 19 2020 17:09:50)

Yes, please see orfeomagazine.fr/documents/Soundboards_DF.pdf



Echi -> RE: Yairi GF 350 - additional harmonic bar (May 20 2020 7:54:19)

That 2nd transverse bar, usually slanted, is commonly attributed to Ignacio Fleta from Barcelona.
The main effect is to stiffen the top and to increase the treble response.
In flamenco guitars is not a common feature but Jesus Bellido and German Barranco are a couple of people using it.



RobJe -> RE: Yairi GF 350 - additional harmonic bar (May 21 2020 16:59:35)

quote:

In flamenco guitars is not a common feature but Jesus Bellido and German Barranco are a couple of people using it.


Yes but in much lighter form. I found this in 2006 - part an exhibition in Malaga trying to show what a luthier workshop might look like. There were various dusty contributions from Jesus and Manuel Bellido. I have one with this reduced Fleta bracing made by Manuel - the best guitar I have owned.

Rob



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