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I want to be able to put an orange tank (36t) into a 100-200km orbit, but so far all my designs fall short in some regard. My smaller planes have good balance fueled/dry, but as I go bigger and add more engines, it becomes harder to keep them stable during re-entry. Additionally, for the bigger planes I'm having trouble getting enough TWR to do my insertion burn when laden (I typically run out of LOX for the rapiers before I have a circular orbit but after my apoapsis is in space). My most successful designs so far (last one is my best small lifter/personnel shuttle): https://imgur.com/a/vY4sDgk I've probably done a dozen or more iterations but none have worked to a satisfactory level, and I don't know what I'm missing. If there's an obvious flaw with my designs, I'd appreciate being appraised of it. Some extra miscellaneous questions: Are the "Tail Connector A/B" pieces appreciably more aerodynamic than the "Advanced Nose Cone A/B" and the Shock Cone? They're very pointy, but also kinda heavy so if anyone knows that'd be great. What do you guys reckon is the optimal mass/rapier? What is the optimal wing shape, and how much lifting area/t is recommended? Please rip my designs to shreds. I desperately need the more efficient price/t of a good heavy lifter SSTO so I can build my Duna mission in orbit.