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I'm John Batchel. I'm with Eric Berger. Elon Musk and the desperate early days that launched SpaceX, his book Lift Off. It is now 2007, the spring again, March of 2007. We're back at Omalek Island. The crew is gathered again for the second flight. There are some details, however, we need to introduce.

Eric, before we set the rocket up and light the candle,

what is the slosh concern?

What are the baffles for the second stage?

So the idea is that as you go up in a rocket,

your fuel drains down, right? It's liquid oxygen,

it's kerosene, and, you know, the tank's empty, and you've got to sort of somehow manage it to make sure that the fuel keeps coming out, and it's, so you pressurize that space and sort of it comes down and it's less

of an issue with the first stage but when you get to the second stage you're in microgravity

so you don't have gravity pulling down on the rocket to pulling you know sort of pulling the fuel

down toward the engine and especially the second stage is also going sideways relative to the surface theory.

So one of the big debates they had at SpaceX before that second flight was on this second

stage, which takes off about two and a half or three minutes after launch, do you need some kind of mechanism there to help that fuel flow,

propellant flow toward the engine?

And that would have been evolved basically putting in slosh baffles.

Now, the challenge with that is the second stage is pretty delicate already because you don't want to have much mass because every pound you put on the second stage,

you're taking away from a pound you could put on a satellite or payload.

And so you want to maximize the amount of stuff you can carry to orbit.

So swash baffles are kind of like, it's almost like a ship in a bottle, like very delicate

...