- Mar 22, 2008
- Reaction score
Yep, it's engine chill most likely, not a concern.Watch the launch video on post 315, it is very visible there.
Small external ullage motors on Starship would work for serial staging, but the idea of hot staging is that they minimize stage gravity losses by going full thrust at separation.Maybe somebody send this to SpaceX
Possibly, but they still need to ensure that the fuel is in the bottom of the tanks before reigniting the main engines. Perhaps they could do the pitch around maneuver with cold gas thrusters, then gimbal those thrusters to provide a linear ullage thrust. They don't need a lot of thrust - they just need to settle the fuel into the bottom of the tanks. They just have to accelerate the dry mass of the stage to slightly faster than the ballistic blobs of propellant.They could just delay the reignition and the first maneuvers of the booster until the Starship is further away....
I was not aware that the booster also had header tanks. If that is the case, then yes, it should just be a matter of waiting until Starship is clear and the hydrostatic pressure in the header tank and feedlines to stabilize.That is what the header tanks in both Booster and Starship are for.