Originally Posted by
SuperPiper on boatdesign.net
What's The Traveller Do?
A traveler may have 2 functions: It allows the boom to be brought up to centre when sailing close to the wind. And it can create some downward pressure when you want to flatten the main.
The twin sheets can also provide these functions: Use the windward sheet to bring the boom back to centre. And, use the leeward sheet to control downward pressure.
The leeward sheet can also act as a preventer for accidental gybes.
Playing the sheets would be a little more complicated. Which would you adjust to maintain helm balance? Adjusting 1 may require adjusting both. Maybe on a cruiser, it would not be so critical.
For some reason, twin sheets have not gained a lot of popularity.