DUCs: Maybe they are emitting a stream of particles behind them which would propel them forward. Or maybe they are launched in a super-energetic state or something and as they travel this energy converts back to matter making the projectile have more mass, and thus more momentum.
Engine Armor: Good idea. I am guessing you make a new "engine component" which is just a damage sink? It might get tricky with the "all the engines need to be the same type to get the bonus" rule of se4.
quote:
Originally posted by geoschmo:
LGM, I think I see what you mean. Give the weapons techs higher tech costs but take them out of the higher branches of the theoretical sciences. To put some distance between the levels, but keep the higest levels from becomeing astronimcaly expensive?
Baron, Not that it matters for game purposes, but wha? 
How does a projectile with no internal propulsion gain momentum with range? Projectiles won't decelerate in a vacuum, but they won't acelerate either. 
Phoenix, I remember your "modular" missles. I was disapointed when you couldn't complete that, it sounded way cool. I may add a simplified Version of it. I don't have to teach the AI to use them, so that helps a lot.
And now for an idea of my own, sort of. Devnull mod has tacheyon armor that protects weapons from the weapon damaging wepons that skip normal armor. I will be adding something similer that protects the engines, if I can pull it off. I think I have it figured out, just have to test it.
Geoschmo