Sonic flights are restricted to military and research aircraft.

只有军事和科研飞机允许音速飞行。

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Aircraft designers routinely use scale models, and in the case of the X-36 Tailless Fighter Agility Research Aircraft, that's as big as it got.

飞机设计师经常使用比例模型，并在案件的X - 36战斗机敏捷性研究无尾飞机，这是因为大的，因为它得到了。

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Simulation based on test data to analyze thedynamic characteristics of the model, research aircraft stopping distance, overload and cableforce relationship in the parameters.

基于仿真试验数据，对模型的动态特性进行分析，研究拦阻过程中飞机的拦停距离、过载、拦阻索拉力等相关参数之间的内在联系；

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As part of a plan to change this, a jumble of aircraft factories and research centres have been lumped together in a new United Aircraft Corporation (UAC).

ECONOMIST: Industry in Russia

There are many confounding variables, however, that affect the value of a business aircraft, and without considerable research it can be difficult to pinpoint the best aircraft for you.

FORBES: What's The Best Jet For You? (Part 3)

The organisation employs more than 400 staff and operates five research stations, two Royal Research Ships and five aircraft in and around Antarctica.

BBC: Glacier, Antarctic (Image: BAS)