CitizenAerospace, He's left that wide open intentionally. So long as it is capable of repeated flights and is within the stated rules, you should be good to go. Deutherius, It's possible to go more extreme. I'm flying a 70kg 4 part craft out to the island without too many issues, but I keep exceeding the ceiling on landing due to my lack of piloting awesomeness If I don't pull it off, I imagine somebody (probably you) will. Good luck! -Slashy