eviator Posted May 10, 2015 Author Share Posted May 10, 2015 Especially now that thrust also varies with atm. pressure, and mostly because of the rather large difference in engine specific impulse now, you really can't just measure delta-v accurately by looking at the vac. delta-v before and after, but you have to actually measure the aggregate expended delta-v throughout the launch. There are mods for this.This also goes for TWR, now more than ever before. I wish KER made the switch for atm. sea level quickly available in the compact view now that it's so important.I wonder if this is the major confusion. Doing the measurements differently offers the possibility that my profile is just fine, and that I'm just not comparing apples to apples. I use the non-atmosphere numbers KER provides in the VAB and the left-over dV in orbit.Unfortunately, this doesn't help me solve my original problem, which is trying to find good general rules for construction and ascent profile. Quote Link to comment Share on other sites More sharing options...
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