I have a tiger chute on my 18. Using a 12' endpole snuffer. Replaced mast with taller SX mast. The tang height is about 27', not sure but can measure for you this weekend while I'm working on it. My blocks are in the deck about a foot in front of the sidestays. I didn't rig the spin, Trey Brown did. I think the blocks could have been attached to the sidestay and would have done that had I installed it myself. Second blocks are on the crossbar. I also run a Tiger main and am completing the conversion to a self-tacking jib system this weekend. I'd be happy to help you as much as I can with measurements, etc. Personal e-mail is ncmbm@hotmail.com
Later checked my reply from Hobie on this, tang is 26'8" on Jacques' Tiger