Help building giant cargo jets.

[SGT_RIZZO300]

I am trying to build a big cargo jet (using B9 and the TT MK4 parts) to move kethane mining rovers around. The problem I am having is that all of them either dont take off at all or just go into a spin. Are the rules similar to small jets or is there something different I should be doing.

EDIT: This one will fly but it's not very stable.

Not sure what happened to the last screenshot, my screen wasn't like that

Edited July 3, 2013 by SGT_RIZZO300

[Geschosskopf]

If you're mining Kerbin, make sub-orbital rockets instead.

[Colonel_Panic]

consolidate more of your drag, engines, wings and intakes toward the rear of the plane. Keep in mind that drag plays a role in stability as well, but there's no 'center of drag' marker to balance, so it's a lot of guesswork... the fact that your center of lift is far above center of thrust though is a bad sign to that end.