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Total capsule length was 10.8 ft, including a retrorocket pack strapped over the heat shield.
Just before the scheduled firing of its retrorocket, a command was sent to inflate cushioning air bags around the landing probe.
Because of weight constraints, there was no backup retrorocket engine.
Biosatellite 1 was not recovered because of the failure of a retrorocket to ignite.
White paint, gold and chrome plating, and a silvered plastic sheet encasing the retrorocket furnished thermal control.
At 250 m from the surface, the main retrorocket was turned off and the four outrigger engines were used to slow the craft.
A backup solid-fuel retrorocket was added to the top of the descent module.
The spacecraft was maneuvered into retrofire attitude and the first retrorocket fired.
The decision was made to leave the retrorocket pack in position during reentry.
The lander/rover will have its own small retrorocket, and, after being jettisoned from the tug, was projected to conduct a braking maneuver to land softly on the lunar surface.
A backup was not needed since its supplies lasted for a 10-day flight, which would allow for reentry by orbital decay if the retrorocket failed.
As he plummeted downward, he saw what appeared to be two of the spent retrorockets pass across the periscope view after the retrorocket package had been jettisoned.
