Problem Reentry help XR5 - IMFD - baseapproach

[english]

Arghhh help please this is really doing my little nut in

I'm undocking from the ISS, in the XR5. I'm trying to use IMFD and baseapproach. I'm setting it to retrograde ( I want to slow down.... right?)

Alt - 80k
ReA - 1.0
Ant-70

At first I was trying to use prograde, and ended up coming into the atmosphere at mach31, I either skipped off back into space or burnt up.

I cant seem to find a reentry burn point that deorbits me without me turning back on myself in orbit, does that make sense? After the burns I end up halting my position over the earth and then turning back towards cape Canaveral. Surely this is insane? I should be able to burn retrograde with a small dv and drift slowly into the atmosphere and slow down.

I've searched, please help......

 

[Tommy]

I'm undocking from the ISS, in the XR5. I'm trying to use IMFD and baseapproach. I'm setting it to retrograde ( I want to slow down.... right?)

If you are setting Base Approach to retrograde, it assumes you want to re-enter from the East to the West (retrograde). This is NOT what you want - prograde is the appropriate setting.

However, this isn't really the right tool for this job (re-enter from LEO). Base Approach is designed more for intercepting a base after arriving from somewhere else.

A better tool for this would be Base Sync MFD (from the same author as IMFD - get it at the same place you got IMFD). It will help you line up with the base in a much more efficient manner, and also will help with the de-orbit burn if you want. You'll also want AerobrakeMFD to help you with the actual re-entry and glide so you can actually reach the base.

It may be possible to use BaseApproach, but you'll want to change the numbers you use a bit. The 1 degree ReA is correct for an Alt of 120k, so you'll need to lower the angle to perhaps 0.2 to prevent you from entering to deeply and overheating/bouncing. You will still use more fuel, and have a higher velocity than if you use Base Sync.

To get from the ISS to KSC, there are two things that need to be done. You need to align your flight path so that it goes over the base, and you need to lower yourself into the atmosphere the right distance from the base. IMFD will try to do this all in one single burn - which may produce some very undesirable effects depending on when exactly it makes the burn. With BaseSync, you will separate the plane change from the de-orbit burn, and each can be performed at it's optimal time.

There are quite a few threads, and some full-on tutorials, for using BaseSync and Aerobrake, just use the forum Search funtion for BaseSyncMFD.

 

[english]

Thank you for the very informative reply, I will give it a shot.

 

[english]

Hello! I've just managed to try out your suggestion ( Nightmare trying to find the free time).

If anyone else finds this thread, as Tommy says, 0.2 is the magic number for ReA. I've not managed to land yet, but I I've managed to enter the atmosphere without bouncing or burning up. I just need to sort out ILS or something for the last bit

Didn't have to download any other MFD's (however I'm sure they make it more accurate and straight forward), IMFD's base approach was able to guide me in.

Thanks Tommy!