Stavanger, Wednesday
Georg, I haven’t heard about any junk-rigged Spækhuggers (spækhugger = killer whale), but I bet they would do fine with a JR. Around 40sqm should give a SA/disp of around 23. The Spækhugger has a ballast ratio of almost 61% and a big nice rudder so should cope easily. I doubt if she would generally out-sail the originals on a race course. These boats are raced by good crews and with good, tunable sails, but I guess that with good helming one may stay in the middle of the pack.
On the last JR I made, we increased the camber from my usual 8% to 9% which I think was an improvement. Maybe 10 % camber would be the optimal compromise for coastal sailing. If you mainly have offshore cruising in mind, it may be wiser to reduce camber to 6 – 8%; who knows.
Anyway, good luck!
Cheers, Arne