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Apollo entered from the Moon at 11.2 km/s, just below escape velocity, about 1.4 times v,,circular,,. This is called '''supercircular''' entry, and downwards lift is required to keep the trajectory within the '''entry corridor''' long enough to slow down below v,,circular,,. Unlike the other lunar entry missions, Apollo 11 performed a shallow skip of a few hundred kilometers, so it could descend downrange from a storm. A larger skip would have cost half an orbit or more, and there was not enough consumables onboard for the astronauts to survive for many hours. |
Apollo 11 docs
technical summary nothing about entry
Apollo entered from the Moon at 11.2 km/s, just below escape velocity, about 1.4 times vcircular. This is called supercircular entry, and downwards lift is required to keep the trajectory within the entry corridor long enough to slow down below vcircular. Unlike the other lunar entry missions, Apollo 11 performed a shallow skip of a few hundred kilometers, so it could descend downrange from a storm. A larger skip would have cost half an orbit or more, and there was not enough consumables onboard for the astronauts to survive for many hours.
