Hey all! I imagine this has been covered before. And I've also read my fair share of relative forum posts, but I was kinda hoping to get some input and perhaps write up a specific run-down of events and the corresponding calculations. So, lemme get to the point. How does one plan their lander / rover missions? More specifically, I'm wanting to know how to most efficiently calculate the minimum TWR and DeltaV necessary so that the most efficient process is the starting point. We're all familiar with the whole "MOAR THRUST!!" approach to getting things done, or simple trial and error and rough estimation. Lots of fun to be had there. Some of what I want to include in this "Guide to Mission Requirements" are things like... Start backwards with the result you want, for example, "a vehicle landed safely on the surface of a planet or moon", instead of just building the whole thing, from bottom to top all at once in a single go. (Trial and error, might is right. ) Calculate the TWR & DeltaV necessary to get that vehicle home safely. Total the mass of both lander and return-flight stage and use that for the basis of initial launch vehicle minimum requirement. If using LOR ("lunar orbit rendezvous" like apollo was famous for having utilized courtesy of support from John Houbolt ) then calculate "time spent in orbital darkness" for after desired insertion / circularization. A nifty calculation that uses a great many of the basic equations necessary for this kind of rudimentary space flight planning. Through this you can make a considerably accurate estimate of battery life and solar recharging rate requirements. Especially handy for maintaining life-support and kethane scanners operational. With lander, and return vehicle mass now calculate the minimum required TWR and DeltaV for atmospheric escape, circularization, and hohmann transfer and stage the launch vehicle accordingly. Maybe this is going a little too far with things for some people. I just think it'd be cool to have as simple a break-down as possible for say, Minmus and or the Mun, for KSP'ers like my son. I'm just kinda curious if I'm missing anything, or if anyone has a point in the right direction to this already done to some extent.