Hi Gilo,

I does the opposite, because I don't know, what my mast can support. But for boats where the gennaker doesn't end at the top of the mast, I guess that trimming the main with a fixed traveller is more logic (the top of the sail needs to be more open, hence more twist, because it isn't in the 'downwash' of the gennaker. 'Downwash' is the flow affected and behind of the lifting surface. On aircraft it goes down, hence the origin of the name. On a sail it is a sidewash).
It is certainly better for drag, but we want maximise speed and not minimise drag... and keep my boat alive.

Cheers,

Klaus