[Parson]

Hex,

I might have a slightly different take on this as I am a reader of SF who has little pretensions about writing it. I am assuming that your book stays in our solar system. Almost all SF dealing with jump/skip/warp drive (never heard of a ski jump drive, but Jules Verne and a few others had space travel by what amounted to cannon fire), is talking about FTL (Faster than light) interstellar travel. Travel within the solar system in a relatively short time (weeks to months rather than years) only requires some sort of continual acceleration drive, able to produce a steady G or so. (In fact if you ramped up the currently available ion drive you would already be there.)