The scale of their 'mock up' rig is vast! Could they not have produced this on a smaller level to prove its worth? Shows how much investment must be in the industry to warrant this!,(reply>), @Herbert Zausenhaim I just presumed that it's a case of working up to it. Paper based calculations, scaled test rig and then full size prototype. If they already have the facility to hand however perhaps they skim over some of the stages.,(reply>), The tower is of course designed to test all conventional elevators. And to test those you need the "full cable length" to address all issues with oscillations and weight.