linear motor -- copley control corp. servotube's high speed motion

Hello everyone, Is there anyone has ever used copley control corp. nade linear motor, Servotube or Thrustube? I am very curious about their high velocity(up to 6m/s even 14m/s), with their max travel is only about 1300mm. How can they get a so high velocityis such a shot distance? For example, Servotube 3804: Force (peak) (N) 744 Force (cont.) (N) 137 Velocity (max.) (m/s) 6.0 Travel (max.) (mm) 1360