Here's the French spruce from Jura mountains @le_bois_de_lutherie that I will use for one of the two Orchestra model I will build in the next months.
Here are the main parameters:
- Radiation coefficient: 11.8
- Young's modulus: 12.8 GPa
- Density: 448 kg/m3
- Q Factor: 178
This is a very stiff board, with density on the high side. Q factor is excellent, though, at 178: the board rings like a bell, also thanks to a very uniform disposition of fibers.
Thickness of the table will be around 2.6mm, to partially compensate for the high density.
A second twin instrument will be built with a different choice for the soundboard only, see you tomorrow for more details! 😊
Cheers,
Giuliano