There are several alternatives, such as the blended wing body and strut/truss braced wings, which offer major potential increases in lift-to-drag ratio and improvements in structural weight fraction. Such improvements in these parameters would provide design margins to address most of the current problems, with the exception of emissions.
amp#160;amp#160;amp#160; 现在有几个可替代选择，例如混合机翼机身以及支柱和桁架加固机翼。这有可能大大增加升阻比并且提高结构性重量分数。这些参数改进将会提供设计余量，解决除了排放之外的当前大多数问题。