The Moment of Inertia for a thick-walled Cylindrical tube with open ends, of inner radius `r_1` and outer radius `r_2` and density `rho`. The following formula is used: `I_x=I_y=(pirhoh)/12(3(r_2^4-r_1^4)+h^2(r_2^2=r_1^2))`, where:
The formula and definition are from Wikipedia (https://en.wikipedia.org/wiki/List_of_moments_of_inertia).