- Engine - we will assume an exaust velocity of 500,000 m/s. This is very hot, but not entirely insane.
- Mass - We will assume we are delivering something of the mass of a Kirov battle-cruiser. That's 28,000 tons, or near as matters 3x10^7 Kg.
Of course,what this really underscores is the un-realism of SF in which large warships plunge through solar systems at multi-G accelerations for days on end.I am not sure I know how important this is to me, though.