The effort involved the design, construction and flight testing of two YF-22 prototypeaircraft.
努力参与设计,建造和飞行试验两y f - 22原型机。
2
Antonov ASTC is engaged in designing and building new prototypeaircraft and modifications of earlier designs.
安东诺夫astc公司专门从事新的原型飞机的设计和制造以及以前飞机的改型。
3
Climbing during daylight hours, the prototypeaircraft ultimately reached an altitude just short of 30, 000 meters, breaking records for non-rocket powered flight.