| With smooth proficiency, the trimmers backed the jib, and the mainsail was eased, swinging the bow around. |
| These lessons proved to be vital, as we had to reef the mainsail and change headsails later that evening under difficult conditions. |
| While the mainsail provides a large portion of power, it also affects the boat's directional control. |
| I used the concept of the sailing boat rig with foresail and mainsail in the 70's as a very slow flying hang glider. |
| This will flatten the upper two thirds of the mainsail and depower the sail. |
| These are twin-hulled boats with a centreboard and a rudder on each hull, a two-sail rig and a mainsail. |
