4. Ergol reserve
The configuration of the launcher and its environment are not perfectly known on the day of the flight. To guarantee a sufficient probability of reaching orbit, it is necessary to plan for propellant reserves, particularly on the last stage.
Let us note m
e
the total propellant mass of the final stage, m
s
its dry mass, m
r
the reserve mass, m
u
the payload mass and v
e
the ejection velocity. The initial and final masses are M
i
and M
f...
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Ergol reserve