Hi all Orbinauts,
I have a question re a specific part of the direct reentry setup for say moon to earth but would also like to be able to apply to say an Earth to Mars trip. I have searched "Direct Reentry" and have found a few informative threads but they don't answer my specific question. I only find one aspect of the setup difficult to determine (we'll use the moon to earth example as it's simpler).
I'd like to be able to setup ANY Pet or GET (ie flight time) and be able to fast forward the scenario so that the moon is in the right position so that I hit EI in the right place for XR2 direct reenty to a specific base.
First off great work Tommy and Mark316 for Toutrial 4 included with the Full IMFD manual which is also a great piece of work. Everything I learned about direct reentry I got from that...very helpful.
As such I'll use that tutorial to illustrate what I'm attempting to ask.
In the tutorial re: the "Magic Number" for GET it says:
Could you apply this same technique and use a little math to find any value of the degrees for any PET/GET?
For instance: I want to go from Brighton to Ascension.
First I assume I need to fast forward ANY scenario so that the min/max Eqi is low enough that I can input -6 or so degrees as the Eqi for Ascension as it's Latitude is 7. something degrees South.
Now lets say I want my flight time (GET) to be 22hrs or whatever. Surely there must be a corresponding degree value as in the example above. Could I not use some simple math based on the 50 degrees for 137hrs example above to find out what the degrees value should be for a flight time of 22hrs?
I know there's some simple math here I just don't know how it's arrived at.
Hopefully my question isn't too convoluted to answer lol.
Cheers
XonE32
I have a question re a specific part of the direct reentry setup for say moon to earth but would also like to be able to apply to say an Earth to Mars trip. I have searched "Direct Reentry" and have found a few informative threads but they don't answer my specific question. I only find one aspect of the setup difficult to determine (we'll use the moon to earth example as it's simpler).
I'd like to be able to setup ANY Pet or GET (ie flight time) and be able to fast forward the scenario so that the moon is in the right position so that I hit EI in the right place for XR2 direct reenty to a specific base.
First off great work Tommy and Mark316 for Toutrial 4 included with the Full IMFD manual which is also a great piece of work. Everything I learned about direct reentry I got from that...very helpful.
As such I'll use that tutorial to illustrate what I'm attempting to ask.
In the tutorial re: the "Magic Number" for GET it says:
More to my point it also says:Set the GET under PeT to 143:30:00. See the manual in your docs folder to see how I got this number.
OK, here’s how to get that magic number. When you set TEj to 6400, there is a GET number directly under that. A few lines down, there is another GET number (much greater, probably around 130:00:00). Open up Map MFD in the right hand MFD, and set the reference to Earth. Now take note of this second, larger GET number (YOU WILL NEED TO REMEMBER THIS NUMBER!) and CAREFULLY time warp until the first GET number reaches it. Slow down to normal time, and set the target in the map MFD to moon (hit the <TGT> button and type in ―moon‖). There should be a little yellow cross, indicating the moon’s position above the Earth’s surface. Time warp some more (again SLOWLY) until the cross is over the east coast of Africa. Slow to normal time and look at the first (upper) GET number. That is the magic number, in this case 143:30:00. In the scenario ―Landed at Brighton Beach‖ in the Scenarios\XR2 Ravenstar folder, 137:30:00 works. Now that you have this number, either use Scenario editor to set the date back to the original starting date, or restart the scenario. To set that number, there is a button <ADJ> (hit <PG> if you don’t see it). There is grey font on the bottom, Adj-_ _ x. Options are 1x, 10x, or 100x. Hit <ADJ> to cycle through these. 1x is used for adjusting seconds, 10x for minutes, and 100x for hours.
This second quote is great as it gets close to the info I want, but the example used is 50 degrees for 137 hrs of flight time.An alternative to the Magic Number method is to open up Map MFD, set target to Moon, then set target to the base you want to land on, then time warp until the longitude of the Moon is 50 degrees west of the longitude of your base, then set GET under PET to 137:30:00. This method is pretty accurate and has worked 100% of the time in my personal experience.
Could you apply this same technique and use a little math to find any value of the degrees for any PET/GET?
For instance: I want to go from Brighton to Ascension.
First I assume I need to fast forward ANY scenario so that the min/max Eqi is low enough that I can input -6 or so degrees as the Eqi for Ascension as it's Latitude is 7. something degrees South.
Now lets say I want my flight time (GET) to be 22hrs or whatever. Surely there must be a corresponding degree value as in the example above. Could I not use some simple math based on the 50 degrees for 137hrs example above to find out what the degrees value should be for a flight time of 22hrs?
I know there's some simple math here I just don't know how it's arrived at.
Hopefully my question isn't too convoluted to answer lol.
Cheers
XonE32