Guru's

I am designing a finned tubing for a conic spiral heat exchanger.Creating the tubing was the easy part. I can't figure out how topattern a "washer shaped" extrusion (representing the fins) aboutthe helex. I tried using the "by curve", but the protrusion staysparallel to the sketching plane of the fin and I need it to beradial. My sketching plane is radial.

Does anybody know how to do this?SolidworksParts And Features