Very thanks, Uwe, Indeed I think that the only way to set up the sails is to be retracted, not spread. If you look at the photo I posted, there are many of the ropes that pass right through the space that the deployed sail would occupy, there is no way to string those ropes and at the same time deploy the sails. I guess the only possible conclusion is that it is a very beginner's model and is not even well thought out.