The ornamental design for a rocketprojector, as shown and described.
1. Rocket projector
1.1 : Front
1.2 : Back
1.3 : Perspective
1.4 : Top
1.5 : Bottom
1.6 : Left
1.7 : Right
This rocket projector is designed with three rocket holes; the rocket trigger mechanism is designed under the body; top, bottom, back, front, left, right and perspective views of the design are presented.