Stock VS RO parts
What is the difference between stock and RO parts? In stock most rockets take 2-3 stages to get to orbit, but in real life rockets take 2-4 stages to orbit on a much larger planet, how does this work?
The biggest difference is the dry mass of the fuel tanks (and other parts, but that makes a huge difference). Like Kerbin, the stock/vanilla parts are general much heavier than they would actually be IRL.
Example:
One of the four boosters on Soyuz 2.1b has a wet mass of 44.4 tons including engines and all associated hardware and a dry mass of 3.8 tons. The dry/wet mass ratio is 0.085.
A stock orange tank with a Skipper on the bottom and a 2.5m nose cone on top (arbitrary choice, b
