What propulsion upgrade method is planned for BE-4 engines starting with mission $ ext{NG-3}$?
Answer
Using subcooled propellants
Performance enhancement for the $7\times 2$ architecture, slated to begin with the $ ext{NG-3}$ mission, involves optimizing the performance of the existing seven BE-4 engines. This optimization centers on increasing thrust output by employing subcooled propellants. This process allows for denser propellant flow and greater efficiency, pushing the total liftoff thrust of the booster assembly from $3.9 \text{ million lbf}$ up toward $4.5 \text{ million lbf}$.
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