#loading.ratio  the ratio of the gross weight of an airplane to some factor determining its lift
  supertype:  #ratio  the relative magnitudes of two quantities (usually expressed as a quotient)
  subtype:  #power_loading__powerloading  the ratio of the weight of an airplane to its engine power
  subtype:  #span_loading  the ratio of the weight of an airplane to its wingspan
  subtype:  #wing_loading  the ratio of the weight of an airplane to its wing area

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