Both mizzen and main mast
have their windward runner set. When you enlarge the photo
you can clearly see the main runner... it goes all the way to the masthead.
The leeward runners aren't removed. They have a small control line with which you can pull them forward and out of the way. The control lines go into small cam cleats
like used for jib-sheets on small dinghies.
As the asymmetric spinnaker
is... well, asymmetric
, the windward runner isn't in it's way while reaching. There's a nifty way of attaching the clew: it has two small block & tackles that connect to pad-eyes on each side of the deck
... like a double main sheet on some boats (cats) without vangs. With these, you can control the clew, moving it sideways to that the spinnaker
stays clear from the runner. This is how cat's do it too, you have the beam of the boat to work with.
Edit: we can't run downwind, we have to gybe downwind because of the aft swept spreaders. We have only one option for a dead run downwind and that is a huge symmetric spinnaker for the main. It has to be the only sail up for a run.
isn't articulating but a clew-line is used to control height of the clew. Beowulf takes it a step further as she can move the bowsprit