U fiirso marinka hoose ka dibna ka jawaab su'aasha kadib isla luqadda marinka: Marinka: Horraantii 1990-meeyadii, Gulfstream Aerospace iyo Sukhoi Design Bureau waxay bilaabeen dadaal wadajir ah oo lagu horumarinayo diyaarad ganacsi oo supersonic ah, oo loo yaqaan S-21. Sababtoo ah baahida suuq ee su'aasha leh ee safarka hawada ganacsiga ee supersonic, ballanqaadka mashruuca ayaa daciifay oo dib u dhac ku yimid. Gulfstream ayaa ugu dambeyntii kala dirtay iskaashiga, in kasta oo Sukhoi ay sii waday shaqada S-21. Su'aal: Maxay labada shirkadood ee diyaaradaha ah wada abuureen?
S-21