I want to build a plane that can fly up to 20, 000(even higher), just like the U-2 but kerbalized. I want it to be easy to control, and have a good high altitude performance. I've got an idea that uses NTRs. But the NTR is too long.
Any ideas?
It's up to you.
Waiter! If I pull the lever, 5 people will die, if I don' pull the lever, I won't see the dramatic moment when the trolley explodes with a bunch of nuclear waste. Should I pull the lever?
If you like sci-fi parts and wants to go where no kerbal had gone before…
Far Future technologies by @Nertea Far future parts include Fission engines, fusion engines, and antimatter!
KSP interstellar extended owned by @FreeThinker Hi-tech parts from molten salt reactor to Alcubirre warp drive.
Blueshift by @Angel-125 Warp parts that is less realistic and more easy and fun.
Pathfinder by @Angel-125 A pretty nice colony mod that includes inflatable stuffs.