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The 23d century is all about retro.

Atomic Rocket has some interesting reading. It's a nice mix of (as far as I can tell) good physics and some science fiction theory.

Basically, the whole site was designed to help new sci-fi authors make their stories closer to scientific reality. So there's a lot of info not only on the various requirement for a mars trip with different types of engines (everything from chemical thrusters to ion drives to nuclear rockets to the sci-fi only torch ships) to what the requirements would be for a crew living on such a ship and what sort of person defense would actually be reasonable.

It's a fun read, and quite educational as well, if not as hard-core science-y as some of the replies.

I draw nomograms, which are sort of like a static slide rule hard-wired to solve one particular equation.