Last game the UP passed a resolution that raised the constructor base speed to 3. Instead of having my constructors having a base speed of 3, their speed became fixed to 3 parsecs/week regardless of extra engines.
So my 'fast' constructors with 4 impulse engines (which should move at 9 parsec/wk) move at 3 parsec/wk. I think what should be happening is that my constructor should be able to move 11 parsec/wk (3+2+2+2+2).