The pic in OP is from my submission to the Chunkin' Challenge, so I tried a few things. I think I got something. You can work out the distance from the f3 menu, but it's horribly inconsistent. The launcher is bolted in place, so moving shouldn't be much of an issue. It wobbles a bit, but doesn't bend or go anywhere. Launch procedure used was just: full throttle, stage and switch to the now accelerating payload. Payload always exploded on impact, no bouncing was recorded. Conclusion - At first I thought the F3 menu divided the distance based on how many times your craft has "divided" (be it by decouplers or explosions) - That would explain the inconsistency on payload impact (based on the angle when hitting the ground - sometimes exploding all at once, sometimes hurling parts a little further). However, using a payload consisting of 1 part gave me the same funky results (and I've tried multiple times) - the launcher itself was still complete, nothing fell off or exploded there. Anyway, based on my tests and my launcher design, the gound distance covered seems to be divided either by 2 (in one case), or by 4 (in a majority of cases). I wouldn't trust either. Other than that, I have absolutely no idea what is going on.