[quote=@CowboyCommando]
[@Willy Vereb], of course they are ludicrous thats whats fun about them. And probably wouldn't work since having black holes as an integral part of your engine power pack would weigh any ship down considerably. Also if you didn't know Hard scifi is sortive my thing... :) But handwavium with pseudo science always makes things just as fun considering its an integral part of our RP. 
[/quote]I completely agree.
As for weight, well, if you don't mind to be bathed in near-megaton energy per second in theory just 155 kilotons is enough for a black hole to last 10 years (in theory). But well, to contain that energy you'd need to make a gigantic core to begin with so that'd weight a whole load more. So the balance is likely somewhere in the multi-million ton range for a blackhole smaller than an atom.
And that's me being optimistic.
There are also other issues like how you make a black hole engine in a system that moves (like a ship) so yeah, you can bet I'd use some handwavium there.
Honestly though the only reason I linked the black hole engine to my colony ships and FTL to make it all the more expensive overall.

[quote=@ClocktowerEchos]
[@Willy Vereb] Does everything have to be exact sciences and follow the exact laws of phsyics as we know them to be fun? Since I doubt people would enjoy having to look through wikipedia pages to learn it or have to spend a good deal of time on their things only to be told "guess what that doesn't work lol, gg try again later".

Besides, with handwavium you can get a lot more cool stuff in. There's a reason why things like Star Wars/Star Trek/40k/Mass Effect are so popular even if they don't listen to Newton.
[/quote]Do you have some personal problem with me mentioning science?
Seriously, chill out. I am not even a GM here so how did this whole line of argument even arise from you to begin with?
I merely provided some insight on what black hole power would really entail because I am frequently see people having these weirdly exaggerated ideas about it.
Which is a problem when I come under fire seemingly on assumptions based on this.