Why do lunar modules need a blast-off platform?
A lunar module needs a blast-off platform because it is propelled by a rocket engine.This engine carries is own fuel and oxidizer and can, therefore, operate at great heights where little or no air is present. It can thus be used on the moon’s surface where there is no air.
Very hot gases are expelled from the rear of a rocket. The engine depends for its operation on the upward thrust (on the rocket and the load carried) being equal and opposite to the downward thrust (of the burnt gases). That is why a blast-off platform is needed.
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