The effort involved the design, construction and flight testing of two YF-22 prototype aircraft.

努力参与设计，建造和飞行试验两y f - 22原型机。

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Antonov ASTC is engaged in designing and building new prototype aircraft 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。

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Climbing during daylight hours, the prototype aircraft ultimately reached an altitude just short of 30, 000 meters, breaking records for non-rocket powered flight.

在白天爬升，原型机最终达到海拔30000米的高度，打破了非火箭动力飞行的高度纪录。

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Clear and purposeful programmatic objectives and milestones must be established, including a decision now to build a useful prototype aircraft to fly by 1995.

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Cobra UK has branched out into the aerospace industry, and is developing a prototype lightweight aircraft seat.

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The FAA's approval of the plan allows for limited test flights for two aircraft equipped with prototype versions of the battery fix.

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