If you click on the ripper in the mapper, there is a projectile PID button, click that,
and you can toggle through the projectile types to change them.
Look in the mapper\scripts\headers\itempid.h and you see this:
#define PID_FLYING_ROCKET (83886081)
#define PID_FLYING_PLASMA_BALL (83886082)
#define PID_FLYING_KNIFE (83886086)
#define PID_FLYING_SPEAR (83886087)
#define PID_FLYING_LASER_BLAST (83886089)
#define PID_FLYING_PLASMA_BLAST (83886090)
#define PID_FLYING_ELECTRICITY_BOLT (83886091)