Windvanes on Ketches or Yawls
I now own a Hinckley B-40 that was originally rigged as a yawl but was converted by Hinckley to a sloop at the request of the owner. He was the US dealer for the Atoms wind vane and apparently the mizzen boom interfered with the proper operation of the vane so he had Hinckley remove the mizzen and replace the main boom with a longer one so he could use the Atoms and demonstrate it. Hope this drastic measure is not needed by your setup although I do like the sloop rig. I have added an inner stay and a small self-tending forestaysail on a Harken roller which makes sail handling possible for a seasoned citizen with a ''bad'' back.