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Hi all, I've been wondering over the last couple days over the speed of light and what reference frame it is based on. Officially (ie. on Google/Wiki) the speed of light is 299,792,458 m/s. The problem I haven't found an answer for yet is what that is in reference to? Is in reference to the...

I've been trying to find some in-depth articles, books, literature etc that describe structural mass fraction, or the structural coefficient. I understand what it is (ie, the % of the dry mass that isn't payload) but not exactly and in detail its relationship with vehicle size and payload size...

Hi all, I've been doing some trial and error experiments with IFMD and I'm wondering, what causes the perturbations between what IMFD (map mode) says will happen vs what actually happens? Most of the time in for example my trajectory from Low Mars Orbit to Phobos my IMFD projected orbit will...

hi all, I was reading the atmospheric reentry wiki page about blunt shaped reentry profiles for reentry vehicles and I was wondering if the XR series or any other ships take the effects of blunt vs sharp reentry shapes into account when for example reentering at an AoA of 0° vs 80°. Do they? Do...

Hi all im Just probably going to lurk for a bit while I learn the different things you can do with orbiter or until I have a question the forum doesn't contain!