Solar propulsion for yacht

I'm considering design and building a yacht using only solar and wind generated electricity including propulsion. Comments/advice.Thanks,Dudley

It's certainly possible. Your difficulty will be storing enough energy to make it worthwhile. A yacht can motor on a diesel tank for weeks non-stop; even on a big bank of batteries it's going to be hard to get more than a few hours at a good speed. If you are content with a small engine that is only used for manouvering into and out of a marina at the ends of a longer passage under sail, I think it could well work. But don't expect to be able to do much in the way of passage making!