Thermo, that would be hard to do, as your ship will be moving say 2 units per second, and the emitter will be laying down particles from the ships position. Only thing i can suggest is taking the ships last position and current position and creating particles in between. This will increase your particle count however, so you may want to decrease each particles life time to compensate.
How to determine a solid line of particles: You would need to take the particles size, and make sure the speed the ship is travelling at, is NOT greater than the particle size. If it is, you won't get a solid line of particles.
How to determine a solid line of particles: You would need to take the particles size, and make sure the speed the ship is travelling at, is NOT greater than the particle size. If it is, you won't get a solid line of particles.