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Anyone know why the trajectory dipped down during the second stage? To gain extra orbital velocity or something? Been too long since I played Kerbal Space Program.

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I noticed Anton Petrov explained it recently: https://www.youtube.com/watch?v=_abdV-HtEJQ

It's named the Oberth effect - something like a powered slingshot.

Yeah I guess it was something like a partial slingshot?

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