SURFACE WOOD SPECIES
Listed below are available, suitable core woods that could be applied to blade assemblies. Most will find that either Ayous, or Limba performs best as medial plies due to being efficient with their physical properties, without adding too much weight (which becomes a big deal when one is dealing with grams of wood in terms of the finished blade's weight). I am always open to special requests that are unlisted, as long I can comprehend your equipment needs as a player, I'm sure we can find what needs to be in your blade...
Spruce (Englemann)
Average Dried Weight: 24 lbs/ft3 (385 kg/m3)
Specific Gravity (Basic, 12% MC): .33, .39
Janka Hardness: 390 lbf (1,740 N)
Modulus of Rupture: 9,010 lbf/in2 (62.2 MPa)
Elastic Modulus: 1,369,000 lbf/in2 (9.44 GPa)
Crushing Strength: 4,560 lbf/in2 (31.5 MPa)
Ayous (Obeche)
Average Dried Weight: 23.8 lbs/ft3 (380 kg/m3)
Specific Gravity (Basic,12% MC): 0.32, 0.38
Janka Hardness: 440 lbf (1,960 N)
Modulus of Rupture: 8,680 lbf/in2 (59.8 MPa)
Elastic Modulus: 934,000 lbf/in2 (6.44 GPa)
Crushing Strength: 4,310 lbf/in2 (29.7 MPa)
Basswood (Lime)
Average Dried Weight: 26.0 lbs/ft3 (415 kg/m3)
Specific Gravity (Basic, 12% MC): 0.32, 0.42
Janka Hardness: 410 lbf (1,820 N)
Modulus of Rupture: 8,700 lbf/in2 (60 MPa)
Elastic Modulus: 1,460,000 lbf/in2 (10.07 GPa)
Crushing Strength: 4,730 lbf/in2 (32.6 MPa)
Limba (Korina)
Average Dried Weight: 35 lbs/ft3 (555 kg/m3)
Specific Gravity (Basic, 12% MC): 0.43, 0.56
Janka Hardness: 670 lbf (2,990 N)
Modulus of Rupture: 12,510 lbf/in2 (86.2 MPa)
Elastic Modulus: 1,520,000 lbf/in2 (10.49 GPa)
Crushing Strength: 6,580 lbf/in2 (45.4 MPa)
Douglas Fir
Average Dried Weight: 32 lbs/ft3 (510 kg/m3)
Specific Gravity (Basic, 12% MC): 0.45, 0.51
Janka Hardness: 620 lbf (2,760 N)
Modulus of Rupture: 12,500 lbf/in2 (86.2 MPa)
Elastic Modulus: 1,765,000 lbf/in2 (12.17 GPa)
Crushing Strength: 6,950 lbf/in2 (47.9 MPa)
Hinoki (檜)*
Specific gravity: 0.40-0.54
Janka Hardness: ~700-800 lbf/in2
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*the only means by which I can get this species is via AliExpress. It feels, and performs well, but I cannot guarantee the source.
Koto
Average Dried Weight: 37 lbs/ft3 (595 kg/m3)
Specific Gravity (Basic, 12% MC): .51, .59
Janka Hardness: 940 lbf (4,200 N)
Modulus of Rupture: 15,290 lbf/in2 (105.4 MPa)
Elastic Modulus: 1,752,000 lbf/in2 (12.08 GPa)
Crushing Strength: 7,590 lbf/in2 (52.4 MPa)
Anigre
Average Dried Weight: 34 lbs/ft3 (550 kg/m3)
Specific Gravity (Basic, 12% MC): .44, .55
Janka Hardness: 990 lbf (4,380 N)
Modulus of Rupture: 12,040 lbf/in2 (83.0 MPa)
Elastic Modulus: 1,588,000 lbf/in2 (10.95 GPa)
Crushing Strength: 6,920 lbf/in2 (47.7 MPa)
White Ash
Average Dried Weight: 42 lbs/ft3 (675 kg/m3)
Specific Gravity (Basic, 12% MC): .55, .67
Janka Hardness: 1,320 lbf (5,870 N)
Modulus of Rupture: 15,000 lbf/in2 (103.5 MPa)
Elastic Modulus: 1,740,000 lbf/in2 (12.00 GPa)
Crushing Strength: 7,410 lbf/in2 (51.1 MPa)