Largest tower crane

The worlds largest tower crane (or construction crane) is the Danish made Kroll K-10000 which, in standard configuration, is capable of lifting 120 tonnes (264,500 lb) at 82 m (269 ft) radius (i.e. the distance from the central supporting column). It stands 120 m (393 ft) high on a rotating cylinder just 12 m  (39 ft 4 in) in diameter without any support wires, but has 223 tonnes (491,630 lb) of counterweights to balance out its 84 m (275 ft) long load-carrying boom. By comparison, a typical large tower crane stands 80 m (262 ft) tall and is capable of lifting only around 3.5 tonnes (7,700 lb) at an 82 m (269 ft) radius. Tower crane capacities are measured in tonne-meter ratings: to calculate the maximum weight a particular crane can carry at a particular radius, you divide its tonne-rating by that radius. For example, a 300 tonne-meter rating crane is capable of lifting 10 tonnes at 30 m.A typical crane has a 300 tonne-meter rating; the Kroll crane has a rating of 10,000!