THIS IS A REBOOT OF THE STOCK PAYLOAD FRACTION CHALLENGE FOR 1.05! Original Thread: Here So let's begin! I was just scrolling trough The Heritage Challenges and there i found the fact that the original mission was shut down and/or abandoned by OP. That's why i decided that i could re-boot the mission and change her up a bit! The Challenge: You must build and fly the most mass-efficient lifter possible for flying to LKO (Orbit must be 100,000 Equatorial, Circular orbit)