Delta V required for raising Orbital Altitude

[spartanhoplite15]

Sorry for asking many questions, but this is really getting complicated. My answers are like in the millions, having done the steps just like you mentioned.

Can you solve this:
TA=456 km
SA=103 km

And please try to explain as in depth as possible about the steps you did.

Thanks.

 

[MJR]

Yeah lemme do it. One sec.

---------- Post added at 05:35 PM ---------- Previous post was at 05:26 PM ----------

If I am not mistaken, these should be the correct answers for both the delta V and velocity.

Delta V (Excluding the subtraction of Orbital velocity) :

https://www.google.com/search?q=%28sqrt%282*6.67259e^-11%29%283.301880e^23%29%28%282.440e^6%2B%28456%29%29%29%2F%28%282.440e^6%2B%28103%29%29*%282.440e^6%2B%28103%29%2B2.440e^6%2B%28456%29%29%29%29&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a#client=firefox-a&rls=org.mozilla:en-US%3Aofficial&sclient=psy-ab&q=%28sqrt%282*6.67259e^-11*3.301880e^23%28%282.440e^6%2B%28456000%29%29%29%2F%28%282.440e^6%2B%28103000%29%29*%282.440e^6%2B%28103000%29%2B2.440e^6%2B%28456000%29%29%29%29&oq=%28sqrt%282*6.67259e^-11*3.301880e^23%28%282.440e^6%2B%28456000%29%29%29%2F%28%282.440e^6%2B%28103000%29%29*%282.440e^6%2B%28103000%29%2B2.440e^6%2B%28456000%29%29%29%29&gs_l=serp.12...4958.17099.0.19121.12.12.0.0.0.0.0.0..0.0.epsugrpqhmsignedin%2Chmss2%3Dfalse...12...1.1.22.psy-ab..12.0.0.iP9GBCXjTD4&pbx=1&bav=on.2,or.r_cp.r_qf.&fp=61431d5e50aba3a7&biw=1784&bih=976

ORBITAL Velocity:

https://www.google.com/search?q=%28sqrt%282*6.67259e^-11%29%283.301880e^23%29%28%282.440e^6%2B%28456%29%29%29%2F%28%282.440e^6%2B%28103%29%29*%282.440e^6%2B%28103%29%2B2.440e^6%2B%28456%29%29%29%29&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a#client=firefox-a&rls=org.mozilla:en-US%3Aofficial&sclient=psy-ab&q=sqrt%286.67259e^-11*3.301880e^23%2F%282.440e^6%2B103000%29%29&oq=sqrt%286.67259e^-11*3.301880e^23%2F%282.440e^6%2B103000%29%29&gs_l=serp.12...46799.47101.1.50901.3.3.0.0.0.1.263.627.0j1j2.3.0.epsugrpqhmsignedin%2Chmss2%3Dfalse...0...1.1.22.psy-ab..15.0.0.rme7768bHPQ&pbx=1&bav=on.2,or.r_cp.r_qf.&fp=61431d5e50aba3a7&biw=1784&bih=976

Orbital velocity = 5.87233374062 m/s
Delta V (Excluding the subtraction of velocity) = 7.49561154509 m/s

So you difference should be around 2 m/s (roughly). Now of course this data is used in conjunction with the hypothetical reasoning that you launched from Mercury. Just go back in the links I sent you and modify the R and M to the Earth's. All it is is a syntactical mess. You got the idea. It was just a matter of how to put it in a calculator without messing it up. I won't lie, that is a lot of data to input all at once. Still doesn't seem right though to me because that is such a low number. Hopefully Kubala can hop in and give us some input. :huh:

 

[C3PO]

Here's one I made earlier: :lol: View attachment ApPeChange.zip

Just enter current ApD/PeD and Target.

Edit: I made some small changes to the spreadsheet.

 

[spartanhoplite15]

Hi MJR,

This is very complicated. Besides, my calculator can't take all of this equation. However, Urwumpe stated that the Vis Viva equation helps calculating delta V.

Here is the link: http://orbiter-forum.com/showthread.php?p=391119&postcount=33

 

[MJR]

Mind I ask what grade in school you are in?
But yes, there are a plethora of ways of calculating it, some more difficult than others. I for one usually go old school and just work it out by hand then transfer to a calculator.

 

[spartanhoplite15]

Well, I think I have to go with the solution I posted from the link I found, because I have tried it and it is really close to the target altitude. So thanks for your help.

 

[blixel]

I made a simple spreadsheet in google docs to calculate the dV for lowering/raising an orbit. It seems very accurate based on what I'm seeing in orbiter, but I would appreciate it if the mathematically inclined among you could double check my work.

This link goes to an extra copy of the spreadsheet, so you're welcome to poke around on it. I still have my original copy elsewhere.

It's straight forward to use. Green parts are intended for user input, blue parts are calculated. Pick the planet you are orbiting from the drop down, type in the altitude of your parking orbit, and then type in what you want your new altitude to be. The spreadsheet will calculate the dV cost.

https://docs.google.com/spreadsheet/ccc?key=0Au6ynjm4RtfudGZaNEJaczlDV2p6VTFwS1dsUFN4NXc#gid=0

 

[spartanhoplite15]

I made a simple spreadsheet in google docs to calculate the dV for lowering/raising an orbit. It seems very accurate based on what I'm seeing in orbiter, but I would appreciate it if the mathematically inclined among you could double check my work.

Orbiter 2010 - Testing my dV calculator for raising/lowering an orbit - YouTube

This link goes to an extra copy of the spreadsheet, so you're welcome to poke around on it. I still have my original copy elsewhere.

It's straight forward to use. Green parts are intended for user input, blue parts are calculated. Pick the planet you are orbiting from the drop down, type in the altitude of your parking orbit, and then type in what you want your new altitude to be. The spreadsheet will calculate the dV cost.

https://docs.google.com/spreadsheet/ccc?key=0Au6ynjm4RtfudGZaNEJaczlDV2p6VTFwS1dsUFN4NXc#gid=0

Hey blixel,

Cheers for the effort but I currently use C3P0 spreadsheet. So I will try it and tell you the results.

 

[orbitingpluto]

It's not a spreadsheet, but I know a MFD that can calculate the delta-v for altitude changes and calculate the burn times for you.
[ame="http://www.orbithangar.com/searchid.php?ID=5668"]DVToolsMFD 1.0[/ame]

It's replaced the Burn Time Calculator for me, despite DVTools not having a autoburn. It's only inconvenient if you don't stop and ask yourself what would be there for you to do.

 

[spartanhoplite15]

It's not a spreadsheet, but I know a MFD that can calculate the delta-v for altitude changes and calculate the burn times for you.
DVToolsMFD 1.0

It's replaced the Burn Time Calculator for me, despite DVTools not having a autoburn. It's only inconvenient if you don't stop and ask yourself what would be there for you to do.

Hey orbitingpluto,

Thanks for the MFD, I was looking for an MFD to calculate dV targets. Much appreciated. :tiphat:

BTW, blixel, your spreadsheet works great too.

 

[C3PO]

Cheers for the effort but I currently use C3P0 spreadsheet.

The two spreadsheets are virtually identical. (I guess great minds DO think alike :lol The only difference is that my version works if you start in an elliptic orbit.
@Bixel: Feel free to use any part of my Excell file that you find useful. I think many users would find a GoogleDocs version quite useful.

It's replaced the Burn Time Calculator for me, despite DVTools not having a autoburn.

Why not use both? Just enter the DVTools solution into BTC for the Autoburn.

 

[blixel]

The two spreadsheets are virtually identical. (I guess great minds DO think alike :lol The only difference is that my version works if you start in an elliptic orbit.
@Bixel: Feel free to use any part of my Excell file that you find useful. I think many users would find a GoogleDocs version quite useful.

Thanks. I don't have Excel, but I was able to import your spreadsheet into google docs. The formatting is kind of messed up looking, but the calculations survived the import. I saw that yours worked for elliptical orbits which is definitely better than what I had, so I used your calculation method and made another copy of my spreadsheet so it would work for elliptical orbits also. Thanks for the great work.

Here's a copy of the one I made for anyone else who doesn't have Excel.

https://docs.google.com/spreadsheet/ccc?key=0Au6ynjm4RtfudGwxOWl4dmpVQ1RvSEZJV1ZIYWxielE&usp=sharing

 

[orbitingpluto]

Why not use both? Just enter the DVTools solution into BTC for the Autoburn.

I could, but the autoburn feature just isn't important enough to me to install BTC. I tend to make a fresh Orbiter install every once in a while to clean out flotsam and jetsam, and after a while I've narrowed down the MFDs I end up wanting to have in every install. It's still a good suggestion though, as it would make routine altitude changes less tense. Sometimes they are a pain in the butt, but mostly I enjoy going "Engine burn coming up in 10, Hailing the Probe again. 5..4..3..2..One Ignition!"

leans back simulating the gees

"Rocket Maan!":dj:

 

[Cras]

It's not a spreadsheet, but I know a MFD that can calculate the delta-v for altitude changes and calculate the burn times for you.
DVToolsMFD 1.0

It's replaced the Burn Time Calculator for me, despite DVTools not having a autoburn. It's only inconvenient if you don't stop and ask yourself what would be there for you to do.

Well that is because DVTools is designed to be used with IMFD, it spits out information for you to input directly into the Delta V program and it leads to great results.