My ANNA LUCJA 2 was designed and built as JR scooner, despite only 6,5m long hull. Now, after some 6 week of test sailing at the lake I am quite happy with the 2 mast design. Originally, sailes should be 12sqm each, I made them 15sqm each, with longer battens, so needed to use double sheets on the foremast. Also, for proper ballance I need rise one panel less of the foresail, as in the picture. For downwind sailing the entire sail goes up. I can carry 30sqm of canvas with masts only 7m tall (above the deck), each weighting some 25kgm, so I am able easily to put them up and down in the tabernacle.  She is very sensitive to the sails ballance - I can change the course not tuching the tiller - just by easing or pulling sheets. At anchor I may rise 1 panel of the main up, and she is pointing great. 

I know in The Practical Junk Rig, it says two masts could be used on a minimum of a 28 foot boat, and I think later it says if its LOA is over 31. My Cape Dory 28 has a LOA of 28.4. As I have had problems finding a good aluminum mast, and am now looking more into wood. I would prefer to have two shorter wood masts for back up,and easier to built smaller masts, havent done the numbers yet, but they should be pretty short, not sure how that would affect the performance in between tall waves maybe..no clue.

Other than mast placement vs interior space , does anyone have any thoughts on this. I will try to do all the figures this coming week , finding the mast placement and height , sail area, etc this week, I just thought maybe someone might have a reason I shouldnt even go down that road..lol.

Thanks