Kwindawo yokwenziwa kweprototype, izixhobo zetsimbi zidlala indima ebalulekileyo ekwenzeni iiprototypes ezihlala ixesha elide nezichanekileyo. Iintsimbi ezifana ne-aluminiyam, intsimbi, kunye ne-titanium zihlala zikhethwa ngenxa yamandla azo akhethekileyo, ukomelela, kunye nokukwazi ukumelana novavanyo oluqatha.