TransMunar Maneuvers - Kerbal Space Program Tutorial


Uploaded by WernherVonKerman on 07.01.2013

Transcript:
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\f0\fs24 \cf0 Hello World!\ \
Now that were able to get to the moon, lets cover some transmunar activities, shall we?\
\ The first maneuver i want to talk about is
called a Free-Return Trajectory. This is a special flight path which takes your ship
around mun and back down to the surface of kerbin. this is actually a gravity slingshot,
as you are using the mun's gravity to take away your angular velocity. The result of
this flight path is that, if you don't perform a breaking burn in the moons sphere of influence,
you'll return right back kerbin's surface.\ \
To do this, you want to aim ahead and above the moon. you can follow the same procedure
as always, to get to the moon and start burning once you see it rise above the horizon. \
\ Except this time, instead of aiming for the
mun's altitude, you want to push your apoapsis to about 14.5 million meters. You can use
the maneuver node system to fine tune your orbit to make sure you'll return back to kerbin.
You can aim so that your periapse when returning to kerbin will be below the atmosphere or
even under the surface. At that point all you have to do is sit back and launch your
parachutes!\ \
This procedure is perfect for your first mun missions, you can probe the mun's surface
and return home with minimal effort. This is the same flight plan followed by the first
manned missions to the mun, it was used in apollo missions 8, 10 and 11. The infamous
disaster during apollo 13 forced the mission plan to be changed, and apollo 13 remains
the only apollo mission to actually make use of the free-return trajectory.\
\ Sometimes, when you transfer to mun's sphere
of influence, you may find you are unable to perform a breaking burn at periapse - because
its below the surface!\ \
Don't worry though! theres an easy way to raise (or lower) your periapse when coming
in on a hyperbolic trajectory.\ A wise man once said that the trick to orbiting
is aiming at the ground and missing. Thats exactly what you need to do here. You need
to add more horizontal velocity to pull your periapse above the surface of the planet.
Just think about which way will be up when you're at your periapse, and burn that way.
Pretty simple!\ \
You can always do the opposite to lower your periapse in a hyperbolic orbit, if you want
a lower parking orbit, or want to set up for aerobraking or even go directly to landing.\
\ I hope you all make good use of these maneuvers,
and I will see you out there!\ }