Also, i'm not sure how many winds, but if you have 47 winds, then i'd do say 15 per coil, 3 coils... depends on how much space you have, and what gage wire
Also, kevin is not doing this, nobody has built this since stan, ( if they did, they didn't share results), but ill build it as soon as i'm done of exams next week.
This is my original drawing, with edited description to show exactly how Stan did it, each line you see as a secondary or choke, just imagine that has your 13 loops on it. but to draw that would make it a lot more complicated!
(http://img.photobucket.com/albums/v81/bigbuba/Picture15-1-1.png)