General aviation pilot reported a near miss with a helicopter after landing at RAP airport during taxi in. The helicopter was cleared to depart from a taxiway with limited visibility from the Tower and the helicopter passed just in front of the pilot on the taxiway as he stopped immediately.

Narrative

I just landed and was cleared to taxi to parking via Taxiway A. Many aircraft exit at G2. To get to my hangar. While taxiing between G2 and G1; a helicopter was cleared to depart via Taxiway A. The helicopter air taxied from the ramp and appeared to proceed with his departure just prior to reaching Taxiway A and directly in front of me; not more than 75-100 feet in front of me. I don't think he even saw me or realized I was there. I saw him just as he transitioned from air taxi to takeoff and stopped immediately. I told the Tower that what just occurred was unsafe. The Tower Controller responded that it was a helicopter and had to depart quickly. I told it it was still an unsafe situation; had I been slightly further down the taxiway; a collision could have occurred. This particular area is not visible from the Tower; and I don't think the controller saw where I was in relationship to the helicopter when they cleared him for departure. This is a very busy time for the helicopters as an event was going on with lots of flights. Still; when operations are rushed; that is where mistakes happen that be tragic.