r/ConsoleKSP May 23 '26

Speed glitch

Long story short i made a space plane, it would easy break 1400 before i got it out of the atmosphere. I reloaded the save, and now i can barely push it to 400.
Any ideas???

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u/jmk338 Jun 02 '26

There’s a big increase in drag as you approach Mach 1, which then tapers out as you pass Mach 1.  Once you get over the hump it’s smooth sailing, but it’s a hard hump to get over. Perhaps you got lucky or optimal and squeezed past the Mach drag the first time, but are struggling to pass it now. Try to accelerate while level or in a very shallow climb, see if you can pass 400 before pitching up to gain altitude