We were both wrong; not even if the projectiles were round. A round object radius=1 has volume ~4.189, a round object radius=6 has volume 904. 904^1/3 (cube root) = 9.669.ORIGINAL: Cap Mandrake
Maybe we should ask Alfred. [:D]
I they were square, 2x2x2 would have a volume of 8. 12x12x12 would have a volume of 1728. 1728^1/3 (cube root) = 12.
Or rectangles, 2x2x10 would have a volume of 40. 12x12x60 would have a volume of 8640. 8640^1/3 (cube root) = 20.520.
Maybe cube root is an approximation that somebody worked out for 1/6th scale for that actual shape of projcetile?