IfcTransportElement is to be used to model cranes. It has a property set called
Pset_TransportElementCommon which has a property called
CapacityWeight to set the lift capacity of the crane. The issue is that manufacturers provide a table of (Weight-radius)s for the crane not a single value.
A crane has different lift capacities at different position of its jib .
I am not sure if this is by design, but It would be nice if this can be addressed.
Till then, I assume , one has to define a custom property to address this(?)