So with the new wind feature in SP 1.6 it's possible to make sailboats that are powered by the wind. Sailboats that are simply pushed by the wind work fine, but real sailboats have the ability to sail close to the direction of the wind. Their sails work like wings, creating a low pressure in front of the sail and a high pressure behind it. This pushes the boat along the water.
My first prototype sailboat was a large catamaran, it used the new gyroscope to steer. It could only sail 90 degrees towards the wind. Not good enough.
After about 15 minutes of messing around with single hull boats (they were better at sailing upwind), I decided to use the new giros to stabilize the boat. This worked wonders on the sailing characteristics of the boat. It could now sail faster than the wind! (With the effect of 'apparent wind').
After balancing out the placement of the sail and rudder, the boat can now sail 45 degrees into the wind! With an average speed of 50 mph in 35 mph winds.
This new update is awesome!
EDIT = Video link died
Try out the boat your self! link
The little yellow triangle at the bottom of the screen is the wind direction.