Newbie questions

[ar81]

I thought I should ask this in this thread instead of starting a new one.
What part of my orbit should I burn pro grade to raise my orbit ?

You might like this tutorial
[ame="http://www.orbithangar.com/searchid.php?ID=3074"]Tutorial: DG to ISS[/ame]

 

[Urwumpe]

read the edit please

Still the same answer. It stands all in the manual and other sources explaining Kepler orbit elements.

 

[Woo482]

ok thanks for the help I don't relay under stand that much about orbits Just enough to get to orbit and land (at nasa's new base in the middle of the Atlantic ocean )
EDIT1: so I burn when Apt is near 0 ? ok then

 

[Urwumpe]

ok thanks for the help I don't relay under stand that much about orbits Just enough to get to orbit and land (at nasa's new base in the middle of the Atlantic ocean )

It is pretty simple. any free-fall movement in a gravity field is an orbit. Even getting a desired orbit is pretty simple. You just need Hohmann-transfers.

I still think about replicating the spaceflight exam questions from my university in the forum, to stir some self-teaching here.

 

[Woo482]

what are Hohmann-transfers ? don't they use them to get space craft to mars ?

 

[Urwumpe]

what are Hohmann-transfers ? don't they use them to get space craft to mars ?

A hohmann transfer is the most basic and usually most effective way to transfer to a new orbit, as you leave tangentially and arrive tangentially (which means, you do all your burns tangentially to the planet, which is more effective as you have no "gravity losses" that way).

http://en.wikipedia.org/wiki/Hohmann_transfer_orbit

Common alternatives are accelerated transfers and bi-elliptic transfers.

 

[Woo482]

ok and how do I get in to a geo stationery orbit ?

 

[Urwumpe]

ok and how do I get in to a geo stationery orbit ?

Like in reality by using a geostationary transfer orbit/GTO, which is just a Hohmann transfer orbit from LEO to GEO. As you rarely launch on the equator, you need to align planes. The best way to do this is at the apoapsis of the GTO, as you are slowest at this point.

 

[ar81]

Still the same answer. It stands all in the manual and other sources explaining Kepler orbit elements.

The problem with theory about Keplerian orbits is not always intuitive for people, specially when they do not see an animation on how it happens...

 

[Woo482]

I don't under stand Hohmann transfer orbit's so can some one give me a really simple explanation on how to do it ?

P.S I just tried to fly to mercury but I am in an oval shaped orbit at least I go fast when I am 650km above earth

 

[ar81]

It means that you make your orbit long enough to touch the orbit of destination planet. Once you reach the orbit of destination planet you circularize your orbit and you have a completed transfer.

It would happen if both planets were in the same plane and in circular orbits.

If you want to understand interplanetary travel I advise to download my tutorial in IMFD 4.2.1 at www.orbithangar.com (do a search by author)

 

[Woo482]

ok and you have a lot of Tutorials. (you should make a tutorial on reading tutorials )

 

[ar81]

ok and you have a lot of Tutorials. (you should make a tutorial on reading tutorials )

If you search by author at orbithangar, you may find all my tutorials.
Each one has a specific purpose/content. I do not like to duplicate.