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Bloostar
bloostar is a launch vehicle currently in development by the spanish company zero2infinity.
It is based on the rockoon concept: the first stage of the ascent is conducted by the use of a high-altitude balloon up to 30 km (19 mi), where the rocket platform is ignited and detached from the balloon to insert the payload into orbit. The launch vehicle is composed by a set of liquid fuel engines clustered as concentric reusable toroids attached to the central payload. Each toroid works as a stage during the rocket climb once it has been ignited from around 30 km (19 mi) above ground level. The stages are progressively separated of the vehicle and then recovered in Earth, similarly to conventional satellite launch with rockets.
Moreover, the use of several toroid-shaped stages results in an increased stand-off distance to the sonic line during re-entry, reducing the possibility of damaging the stages because of the high temperatures reached. Another possible advantage is the capability to launch satellites with no need of folding them, as a flat-shape vehicle is capable of fitting panel-deployed satellites right from the launch site.
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Bloostar」の詳細全文を読む
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