Australian/New Zealand Luthiers Forum

I am making one, not finished yet. Roy Courtnal have a plan available on his web page, you can take some measurements from there.
https://www.masterguitarplans.com/roy-c ... -strutting

I had the opportunity to know her in person back in the early 90's when she come to Portugal. I never saw her "working" but I did see her work and playing. Since that time she is able to do a really great job.

Looks like a great book.
For people that is interested, take a look around where it is available. I just order from Amazon (UK) for £40 (used, hardcover)

Thanks jeffhigh, woodrat and Trevor,

Besides the information in the Section 4.6.1.3, the fig. 2.4-5 also give some prediction.

I'm done with the box for the moment, I'll moving with the bindings and I'll be back to tunning at late stage.

cheers
Jorge

Hello Jorge...Welcome to the forum....I couldn't add anything more to what Jeff said as it is good advice....I just wanted to say Welcome to the Forum. I checked out your website....Very nice work...:) Also I wanted to ask you what program you used to develop the frequency response curve? It looks ...

Thanks jeff for your reply,

I was think about doing exactly what you say. By the way, I choose to do the back active, with the radial brace system. I don't know if it work well with fleta, but we'll see.

Fleta1408_coup.jpg My first tap test just after closing the box is as in image Fleta1408_coup.jpg as the blue line: What I can see so far is: 1. T(1,1)2 at 215Hz is too hight; 2. The peak at 257Hz I assume is T(1,1)3 After a few sand job on the back (red line): 3. The T(1,1)2 drop a little to 212Hz...

Thanks Trevor and Martin, very helpful information.

cheers

Jorge Bertholdo

Usually the domed dish have it's deepest point at the center (of circumference).

What if the deepest point is at the place where would be the bridge on the top (and/or back)?

Is there any acoustical consequence positive or negative?

regards

Jorge Bertholdo

Dumb question. How do you import VA text files to Excell? I can get the file to open in Excel and get each line of data in a separate row, but I get both the frequency and the amplitude in one column, so I can't plot them. I use open office, but I believe in Exel should be something similar. 1. Exp...

Thanks Trevor for your answer, I suspect the problem came cumulating from equ 4.5.2. By my calculation, EL is 11.90, (11.96 on table 4.5-3). Any way, my "solution" is not the best one, but works. I already spend many hours on this problem, I'll stay with my "fix" for while, I will back to this probl...

One more thing.

What's dimension a and b used on table 4.5-3?

I'm been trying to make the equ 4.5-7 work. For the sample #1 on table 4.5-3 I'm getting 65.590. Also I did it by hand and I'm having the same result. So, obviously, OpenOffice is doing the math the wrong way (just like me). So, what I did to solve this is: -I divided the wrong answer for the thickn...