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After the Shuttles main engines start, but while the solid rocket boosters are still clamped to the pad, the thrust from the Shuttle's three main engines causes the entire launch stack (boosters, tank and shuttle) to pitch down about 2 m.

This motion is called the "nod", or "twang". As the boosters flex back into their original shape, the launch stack pitches slowly back upright. This takes approximately six seconds.

At the point when it is perfectly vertical, the boosters ignite and the launch commences

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16y ago

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