Annie wrote:

The clipper bow certainly appears to be a bit of a vanity and an add-on extra, but I have met 2 or 3 people who have sailed fairly extensively on these boats and rate them highly.  It would appear that very few boats react negatively to being rigged as junks.  If it were me, and I liked the boat,  I'd go for it, but put in a lot of effort to keep the mast light. Good luck!

I think Annie has a very good point. I looked up pictures of the Nantucket 29, and apart from the lengthened nose, the hull lines looked good, in my view. Her designer, Alan Buchanan (1922-2015) was after all a well-respected designer. If I were to fit a JR to an N29, I would first draw a false bow a foot or so from the real one, and use this as a reference when  positioning the mast. The mast of my Ingeborg sits 14% of the waterline from the bow. I have even seen successful boats with the JR mast only 12.5% from the bow (at the wl.). With the false bow line as a reference that should bring the mast far enough aft to avoid static or dynamic nose-down problems, as long as one keeps the mast’s weight around 2.5-3% of the boat.
I haven’t checked what position of CE will come out of that.

Then, before jumping at it, one must check that the mast doesn’t collide with the interior...

Arne

Thank you guys, I did not expect such thoughtful thinking!
On this project, nothing is yet started. If it goes on, I surely make you guys know, but I can't goany further for the moment.

I think Asmat has made an assumption in regard to his advice. Looking at plans and photographs of the Nantucket she has a fairly full bow with the clipper nose and bowsprit added on the front. I do not see any reason she should not be a candidate for junk rig. A schooner rig with a small foresail mast in the fore deck and a larger main mast in the center of the saloon would, I think, make an excellent rig for this design.

Clipper bows have fine waterlines and lack buoyancy, compared with a more apple  -cheeked hull form.The weight of a junk mast well forward, combined with the thrust of the sail, running downwind, would tend to depress the bow. I don't think a Nantucket Clipper would be very happy under junk rig.