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Center of lift position changes before/after flight


Timmon26
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Encountering a recurring issue and I can't tell if it's a bug or what.

When designing a new craft I'll naturally check to make sure the center of lift is behind the center of mass, including both when tanks are full and drained. Invariably, when designing spaceplanes or similar craft, a CoL placed ahead of the CoM will have moved behind the CoM after test flying the craft and returning to the editor at least once.

Here's a VHTL plane I was working on and the CoL was well behind the CoM when I launched it (with both full and dry tanks). It flipped out on reentry so I reverted to VAB and the CoL was suddenly here:

k1GlsOx.png

This explains the instability, but it would have been nice to have known this was the true CoL beforehand. This has happened with every single VTHL spaceplane I have ever built. KSP is apparently able to calculate the true CoL, but will not until the craft has been launched, otherwise it will show the CoL as being behind where it actually is. Naturally this makes adjusting control surfaces unplayably tedious, as a flight is required between each adjustment.

Has anyone else encountered this issue or can replicate it?

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Actually, it's a VERY good idea to do that because it tells you if the "plane" will drop like a rock or flip backwards uncontrollably, etc.

In regards to the actual problem, try rotate-wiggling it a bit? Watch the vectors in various AoA configurations? When you first slap huge pieces on (like whatever disaster is going on with those toroid spikes :), those aerodynimc aids do seem to not work so well until the game redoes the calculations a few times, I've found.

Edited by surge
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