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1.0.4 suborbital flights: too slow to land safely ? on Kerbal Space Program

While messing around in a new career mode in 1.0.4, I had some contract asking for suborbital flights, and also orbits around Kerbin. After having accomplished a few, I came to realise something rather counter-intuitive concerning aerodynamics and reentry:

For the same reentering capsule, an reentry from LKO will be slowed down enough to deploy chutes and land safely; while for some obscure reason, reentry from a suborbital flight (~75km apoapsis), even though going slower initially, will lose less speed and end up too fast too low, leading to unavoidable crash, even when using chutes as soon as possible.

I haven't conducted methodical tests with different flight profiles to determine the exact circumstances of this event, but I have had a few suborbital flights that ended up crashing, even in the sea, at alt 0, due to being too fast too low.

I thought a some time about it, and have come up with two possibilities explaining this:
1- (the most plausible to me) Vertical velocity issues:
The craft does not slow down much as it is slower when coming back from suborbital flight, but the reentry being steeper, the vertical velocity ends up being higher than for an orbital reentry. This would explain this issue, and the fact that going "faster" (with higher horizontal velocity) in a suborbital flight prevents it. The thing is, when getting down to under 10km after reentry, whether you come back from LKO or suborbital flight, your ship has basically the same trajectory, almost vertical, so there would be no reason why speeds are different between the two.

2- KSP aerodynamics being inaccurate:
The title speaks for itself: for some reason, aerodynamics is inaccurate and creates this issue inevitably. I know that KSP stock aerodynamics is not an exact model of the Earth's atmosphere, but even when considering approximations, the drag induced by the reentry should make the two profiles end up the same way. What could also cause this, is the fact that drag in 1.0.4 was reduced, and for some aerodynamic reason, this creates the issue discussed.

I made this thread to see if anyone else has encountered this, or would like to discuss it, or even come up with a solution to it. :wink:

(I may add screenshots if anyone asks for some.)

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