In the three types of performance requirements under /cpacs/vehicles/aircract/model/performanceRequirements, a single engine map can be specified for each analysis case (e.g. under .../trimRequirements/trimRequirement/. On the other hand, each engine under /cpacs/vehicles/aircraft/model/engines has its own reference to an engine type and, hence, to a corresponding engine map. There might be cases (e.g., experimental aircraft) where not all engines may be of the same type and hence may use different engine maps. The current definition of the performance requirements does not allow for such a case, because only a single map can be specified, thus taking away the freedom to use engines of different type simultaneously.
In the three types of performance requirements under /cpacs/vehicles/aircract/model/performanceRequirements, a single engine map can be specified for each analysis case (e.g. under .../trimRequirements/trimRequirement/. On the other hand, each engine under /cpacs/vehicles/aircraft/model/engines has its own reference to an engine type and, hence, to a corresponding engine map. There might be cases (e.g., experimental aircraft) where not all engines may be of the same type and hence may use different engine maps. The current definition of the performance requirements does not allow for such a case, because only a single map can be specified, thus taking away the freedom to use engines of different type simultaneously.