A cascading system of blocks running inside the boom. This replaces the large blocks usually used for mainsheets. IT is similar to how your downhaul works, but inside the boom. Pretty common on tornados. Mike (nick: Tornado) posted a picture of his cascading setup on this thread: http://www.catsailor.com/forums/ubbthreads.php?ubb=showflat&Number=185817#Post185817

I added a schematic on how this can be done below. This was something Macca posted on the TornadoCat list some years ago.

Tom, I hope we are not hijacking your thread and that you find this relevant.

Attached Files
cascading-in-boom-mainsheet.gif (2260 downloads)
In boom cascading mainsheet.
Last edited by Rolf_Nilsen; 07/23/09 08:24 AM.