[Suicide Junkie]

Geo's got it.

Ion engines give three standard movement, CT gives 4, JP 5, Quantum 6, and Grav drive IV's give 7 movement points per engine.

You need one movement point for every 50 kt of ship in order to get 1 speed.
The Battlemoon weighs 10,000 kt, so 10k/50 = 200 points to get speed 1.