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A roll program or tilt maneuver is an aerodynamic maneuver that alters the attitude of a vertically launched space launch vehicle. The maneuver is used to place the spacecraft on a proper heading toward its intended orbit. A roll program is completed shortly after the vehicle clears the tower. In the case of a crewed mission, a crew member (usually the commander) reports the roll to mission control which is then acknowledged by the capsule communicator.〔(NASA - STS-117 Lift Off! ) ''ATLANTIS: "Houston, Atlantis. Roll program." Voice 1: "Roger roll, Atlantis".〕 ==Space Shuttle launch== During the launch of a space shuttle, the roll program is simultaneously accompanied by a pitch maneuver and yaw maneuver.〔(【引用サイトリンク】title=Why does the shuttle roll just after liftoff? )〕 The roll program occurs during a shuttle launch for the following reasons: * To place the shuttle in a heads down position * Increasing the mass that can be carried into orbit * Increasing the orbital altitude * Simplifying the trajectory of a possible Return to Launch site abort maneuver * Improving radio line-of-sight propagation * Orienting the shuttle more parallel toward the ground with the nose to the east 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「Roll program」の詳細全文を読む スポンサード リンク
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