...or about .13 on pure speeddrive if you were willing to accept the drive taking up more than half of your available mass and having a few extra-special quirks. Note that at that point you no longer have the available mass to put in a hybrid engine.
Basically, anything of SUV size or smaller can take .1 as a gimme. Pulling .11 is Cool Stuff, and should have some sort of justification/drawback associated. It would also allow you to outrun everyone in space who wasn't *specifically* built for speed. Anything past that is nontrivial.
Notice also that this is long-haul. You can certainly have ships that are agile over short distances without too many problems - especially if they are relatively small and max out around .1c or below. Agility is what really matters if you're trying to go fast without hitting things.
The .18 on the Records page? Well, take a look at the speedster entry in the Ship Registry thread.
Basically, anything of SUV size or smaller can take .1 as a gimme. Pulling .11 is Cool Stuff, and should have some sort of justification/drawback associated. It would also allow you to outrun everyone in space who wasn't *specifically* built for speed. Anything past that is nontrivial.
Notice also that this is long-haul. You can certainly have ships that are agile over short distances without too many problems - especially if they are relatively small and max out around .1c or below. Agility is what really matters if you're trying to go fast without hitting things.
The .18 on the Records page? Well, take a look at the speedster entry in the Ship Registry thread.