平流层发射飞机净重约227吨，可搭载约113吨燃料，最大有效载荷近590吨。

It is powered by six engines of the same type used by Boeing 747s.

它由6台波音747所用的同款发动机提供动力。

AIR LAUNCH

空中发射

On launch missions, Stratolaunch will carry as many as three rockets attached to the center of the wing between the two fuselages. The rockets will be released, ignite their engines and carry small satellites weighing up to 1,000 pounds (453.6 kilograms) to low Earth orbit.

在执行发射任务时，平流层发射飞机可在双机身中间、机翼中心位置搭载多达3枚火箭。飞机可以让火箭点火、发射，将其携带的重达454公斤的小型卫星送入近地轨道。

According to Stratolaunch, the advantages of its system include being able to use numerous airports and avoid the limitations of fixed launch sites which can be impacted by weather, air traffic and ship traffic on ocean ranges.

据平流层发射系统公司介绍，这套系统的优势在于能适应众多机场，固定发射场所可能会受到天气、空中交通状况以及海上船运状况的影响，而平流层发射系统能避免这些限制。

HISTORY

历史回顾

Airborne launches date back decades, most famously to the X-15 program of the 1950s and '60s, when manned rocket planes were carried aloft under the wing of a B-52 bomber and released on hypersonic research flights.

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