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[1.8-1.11.x] Trajectories v2.4.0 (2021-02-07) : atmospheric predictions


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Am I correct in thinking that Trajectories assumes a roll angle of zero degrees when calculating the trajectory as opposed to whatever roll the vehicle is currently at?

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Posted (edited)

I'm not getting an accurate trajectory in 1.11.2, it doesn't seem to be accounting for atmospheric drag. Was FAR compatibility broken at some point?

EDIT: NVM, reinstalled FAR, problem solved

Edited by dlrk
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I'm a little confused by what the P/R buttons do. Do they just define whether "0" is direct prograde or retrograde?

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6 hours ago, dlrk said:

I'm a little confused by what the P/R buttons do. Do they just define whether "0" is direct prograde or retrograde?

I think it tells the mod which way the vessel will be entering

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Posted (edited)

Does anyone know why when I plan an Aerocapture maneuver on Laythe with my SSTO and I get the X to be directly on a spot I want on my manuever, it moves later? While set to Prograde in the descent profile at 0 Degrees it changes to be completely off mark when I'm just about to enter the atmosphere. I'm still facing prograde; I don't know what's going on.

Am I missing something?

X marks the spot here:

voxUarA.png

 

X doesn't mark the spot here: veers off way before my target despite nothing changing and me facing the correct direction I had plotted for reentry (0 degrees from prograde)

IE3W4eQ.png

Edited by rudemario
Grammar
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14 minutes ago, dlrk said:

Do you have body fixed mode selected?

As far as I'm aware it doesn't make much of a difference when you're measuring specifically body-centric calculations like what happens when you're near the surface of the planet, and it removes the disconnect from the cross and the trajectory line, but no, I don't have it on.

For example, here is the screenshot with it disabled:

HYmJS0W.png

And after I enabled it to show:

Nk5DZAK.png

 

Any other ideas why? I appreciate the help.

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On 5/8/2021 at 8:08 PM, rudemario said:

Does anyone know why when I plan an Aerocapture maneuver on Laythe with my SSTO and I get the X to be directly on a spot I want on my manuever, it moves later? While set to Prograde in the descent profile at 0 Degrees it changes to be completely off mark when I'm just about to enter the atmosphere. I'm still facing prograde; I don't know what's going on.

Something I've done to fix that is go through all the zeroes in the descent profile and just click each one and hit enter. Maybe it's showing zero when it's not actually set to zero?

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On 5/9/2021 at 5:08 AM, rudemario said:

Does anyone know why when I plan an Aerocapture maneuver on Laythe with my SSTO and I get the X to be directly on a spot I want on my manuever, it moves later? While set to Prograde in the descent profile at 0 Degrees it changes to be completely off mark when I'm just about to enter the atmosphere. I'm still facing prograde; I don't know what's going on.

This means that the prediction is wrong. There could be a few reasons for this:

  • Predictions in the upper atmosphere are difficult, so if you spend a lot of time there, deceleration will be underestimated.
  • Physics time warp actually changes your trajectory! The higher the time warp, the less drag you experience.
  • Is "Use Cache" enabled in the settings? That increases performance but decreases accuracy.
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