Questions tagged [resistance]

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20
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4answers
4k views

Is it harder to enter an atmosphere perpendicular or at an angle

I've heard that because Earth's atmosphere is so thick that some spacecraft can 'bounce' off the atmosphere if they don't enter at the correct angle. This leads me to believe that shallower angles ...
5
votes
0answers
109 views

In landing, how much of a Falcon 9 First stage's velocity is lost to air resistance and how much to retropropulsion?

Thinking about this question I was led to wonder to what extent retropropulsion is used to kill the F9 first stage's full velocity and to what extent it is used simply for course control and landing, ...