Hi Ray, at the bottom of the Information Exchange page you can download the specs for the e 27. in there it shows mast sizes for the boat. A simple way to measure is attach a tape measure to your halyard, run it up to the tape line if its a tall rig it will be in the 30 ft range. I dont have the exact figure with me. Make sure to tie a line on the schackle so you can pull the line back down. Its a big drag if the tape breaks using it to pull your halyard back. If there is know tape line on your mast, like mine I just attached the tape measure on to the schackle with the main and pulled her up, If this is clear as mud let me know Nic
