Flight Question Reentry from the moon

[carfoggia22]

Yes, the Delta-Glider.

 

[boogabooga]

Was there a red light flashing in the cockpit?

 

[carfoggia22]

Yes

 

[boogabooga]

Yeah, you tore off your elevons.

 

[carfoggia22]

So, what is the solution? A higher Perigee? Is 65km good?

Inviato dal mio GT-I9060I

 

[Urwumpe]

So, what is the solution? A higher Perigee? Is 65km good?

Inviato dal mio GT-I9060I

For the moon? Fly much higher. I would not go below 80 km for that with a DG. What destroys you is mostly dynamics pressure, if you are high enough, much larger speed only demands a small increase in altitude.

(I don't remember the exact limit of the elevons anymore, but if you fly at 11.4 km/s in 85 km altitude, you will have less than 550 Pa dynamic pressure)

 

[boogabooga]

So, what is the solution?

I already said.

Try it again but turn "damage and failure simulation" off.

 

[STS]

I think disabling damage and failure is not the solution, that is nearly cheating.

I would try what Urwumpe says, and if that doesn´t work, I´d arrive at earth with a 250km PeA and then circularise using engines and the normal deorbit from LEO.

What I said is safer, but I would give a try at what Urwumpe says.

 

[1987VCRProductions]

On the subject of reentry from a lunar return, how do you figure out what time to return so that you can reenter over a specific ocean or continent? In Lunar Transfer MFD, you can set the reentry time when you perform TEI. Do you look at what part of the Earth that's opposite of you when you make the TEI burn and then figure how many times the Earth rotates in the time it takes you to return or is there a simpler method?

 

[Lmoy]

It might even be helpful to switch to using the DGIV, as its better-modeled damage and failure simulation would make it much easier to see what's going wrong and where, as long as you know where to look on the displays. I recall that I was able to safely aerobrake from Lunar return at ~65 km with the DGIV, which brought my apoapsis to a reasonable altitude for subsequent LEO insertion, though the hull temperatures were over 2000 degrees at peak heat load, so going higher and shallower with an inverted reentry would probably be safer and more effective.

 

[Urwumpe]

On the subject of reentry from a lunar return, how do you figure out what time to return so that you can reenter over a specific ocean or continent? In Lunar Transfer MFD, you can set the reentry time when you perform TEI. Do you look at what part of the Earth that's opposite of you when you make the TEI burn and then figure how many times the Earth rotates in the time it takes you to return or is there a simpler method?

Practically like you say.

You can also just say that you must add 15°E for each hour of travel time.

 

[Koloss]

It might even be helpful to switch to using the DGIV, as its better-modeled damage and failure simulation would make it much easier to see what's going wrong and where, as long as you know where to look on the displays. I recall that I was able to safely aerobrake from Lunar return at ~65 km with the DGIV, which brought my apoapsis to a reasonable altitude for subsequent LEO insertion, though the hull temperatures were over 2000 degrees at peak heat load, so going higher and shallower with an inverted reentry would probably be safer and more effective.

Interesting. I never managed to do a direct reentry with the DGIV.
Clearly I make mistakes because you obviously manage to do it.

Will try it again this evening.

 

[Abdullah]

I must note one thing with the utmost strength and urgency. Congratulations on learning Orbiter at orbital speed! As you can see from my profile, I've been here almost 2 yrs and am just learning how to perform orbit changes and reentry, and haven't even had my free ISS trip yet! XD
#AdmittingN00Biness