This is called orbital speed and requires about 4000 m/s of Delta-V for Kerbin.ĭrag decreases almost exponentially until you clear the top of Kerbin's atmosphere (which is at 69,078m). Gravity will continually pull a craft straight down toward the ground but by traveling sideways fast enough, the craft continually avoids falling downward straight enough to hit the atmosphere, much less the surface of Kerbin. You also have to gain sufficient horizontal velocity to, as a respected author once defined flight, throw yourself at the ground and keep missing. But simply gaining altitude isn't enough. Gravity decreases with the square of the distance as you move away from the center of Kerbin. The main rules for getting an object into space from Kerbin and keeping it there (which is called achieving a stable orbit) are fairly easy to explain: Your craft must overcome gravity and drag.
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