Berny,

my understanding and opinion is that the rig will loose power and increase drag for each wave it passes over. By hobby horsing I think of short, fast, ocillations. But I think what Darryl describes is a slower cycle, where the boat still goes faster as the rigs movement is smaller and thus more efficient.
That is the point I have reached so far, please enlighten me <img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />