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TLDR I did some tests with various rotors to determine which yields the highest lift/weight ratio for heavy payloads on either Kerbin or Eve. In the static tests I’ve performed on the ground of Kerbin and Eve, I noticed that the large helicopter Type S blades provide the most lift per tonnes rotors+motor . In my flawed tests, 8 rotors per motor work best on Kerbin and 4 rotors per motor work best on Eve. I was also able to roughly determine the maximum mass of a craft at which it would still fly. Long story I’ve been running tests with various sizes of propellers
I've been working on an program to calculate combined takeoff and landing delta-v from a wide range of planet sizes (comets through superearths) and atmospheric thicknesses (vacuum through supervenuses). I'm reasonably happy with the takeoff delta-v calculation - a two-burn Hohmann transfer from surface to orbit assuming a vacuum, plus a term to approximate atmospheric drag. It's not perfect - it makes several assumptions including unlimited TWR on the rocket - but it's a decent first approximation. The landing delta-v calculation involves a deorbit burn and then a braking burn.