These are some nice tips, thank you I managed to start the SSTO by flying very low but my remaining DeltaV was still lower (2200m/s instead of 3000m/s). I did some further testing and on a fresh install without any mods, the SSTO accelerated as usual And some tests more brought me to the amazing result: it is a bug in the missing history mod. The FL-T800 Fuel Tank got a new skin by this mod and somehow, this skin is the reason for my SSTO being stucked in the sonic barrier. Changing the s
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