Hello there. Do mind evaluating the calc below? It's basically Nakime's creation feat that would potentially bump KnY to low 7-C.
I used the area of the Himeji Castle as a basis because that's the best real life comparison to the fortress and basically serves the same purpose as it and also existed during KnY's time period.
Volume of sphere was used because the base area of the Himeji Castle is a circle (Stated on wikipedia). A 80% hollowness low end was used because it is much more densely packed than a regular building (refer to the scans here in the anime: ) although I feel like 70-75% could potentially work as well.
Here's the calc:
Area: 2 330 000m^2
Radius: 861.99802m
Volume of sphere: 2.67546e+9, divide by 100 = 26 754 600m^3
26754600 x 80 to get hollowness percent = 2 140 368 000m^3, using 1.225kg/m3 for air density = 2 621 950 800kg
26754600 x 20 to get structure percent = 535 092 000m^3, divide by 100 = 5 350 920m^3
5 350 920 x 30 for concrete percent = 160 527 600m^3, using 2400kg/m^3 for density = 3.8526624e+11kg
5 350 920 x 70 for wood percent = 374 564 400, using 481kg/m^3 for hinoki density = 1.801654764e+11kg
2 621 950 800kg + 3.8526624e+11kg + 1.801654764e+11kg = 5.680536672e+11 (Low 7-C)
I used the area of the Himeji Castle as a basis because that's the best real life comparison to the fortress and basically serves the same purpose as it and also existed during KnY's time period.
Volume of sphere was used because the base area of the Himeji Castle is a circle (Stated on wikipedia). A 80% hollowness low end was used because it is much more densely packed than a regular building (refer to the scans here in the anime: ) although I feel like 70-75% could potentially work as well.
Here's the calc:
Area: 2 330 000m^2
Radius: 861.99802m
Volume of sphere: 2.67546e+9, divide by 100 = 26 754 600m^3
26754600 x 80 to get hollowness percent = 2 140 368 000m^3, using 1.225kg/m3 for air density = 2 621 950 800kg
26754600 x 20 to get structure percent = 535 092 000m^3, divide by 100 = 5 350 920m^3
5 350 920 x 30 for concrete percent = 160 527 600m^3, using 2400kg/m^3 for density = 3.8526624e+11kg
5 350 920 x 70 for wood percent = 374 564 400, using 481kg/m^3 for hinoki density = 1.801654764e+11kg
2 621 950 800kg + 3.8526624e+11kg + 1.801654764e+11kg = 5.680536672e+11 (Low 7-C)