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Not disrespect intented, I respect SA's crew works and generally accept its calculations. But, as any other competitive "company", I should show my version of the product: They calculated Terry lifting the boulder as 192 tons, issue is that they consider the boulder as a sphere rather that a ellipsoide. So starting:

TreeyLift
  • Terry = 216.455 + 93 = 309.455 px = 177 cm (according to the same video)
  • Boulder width = 1160 px = 663.5 cm
  • Boulder height = 200 px = 114.4 cm
  • Volume = 4*pi/3*114.4*(663.5/2)^2 = 52739560 cc
  • Weight (density also showed in the video) = 52.73956*2360*9.81 = 1221005.2 N
  • Buoyancy = 52.73956*1020*9.81 = 527722.6 N
  • Total weight = 1221005.2 - 527722.6 = 693283.2 N ==> Mass = 70.671 tons (Class 100)