In order to maintain the same entry angle to the wind the boats mainsail and jib had to be trimmed on -meaning pulled in progressively as the boat accelerated.

Ac75 apparent wind angle. A cooling fan a bilge pump a wind indicator a line or quadrant connecting a string. What is apparent wind. Thats apparent wind - its what your hand feels out of the window and on a boat its what the sails feel.

Pressure in the sails is given by the apparent wind strength tws. Relative to Boat Speed Direction - Port side Starboard. True wind speed tws is 10kn.

The popular analogy is that of riding a bike. Get on a bike and start pedaling. The wind is blowing hard on your back say at 20 knots true wind speed.

On a conventional rig if you have a square top sail when you are getting overpowered then it can only feather as far as the apparent wind angle and then it just sits there. As an extreme example ice sailing sleds with vertical wings and only thin blades touching the ice can achieve an 11 degree angle off the apparent wind. For example consider you are at the top of a small hill.

How do I know whether to use Apparent or True wind when swinging sideways at anchor as a storm comes up. In traditional sailboats this angel is about 30 degrees off the apparent wind angle. H as part of a simple mechanical wind indicator that has no purpose otherthan indicating the apparent wind direction.

Section 1 Going upwind with beta between 45 deg and 50 deg. As with the AC72 the vexed issue with the Code Zero is that in displacement mode the Extra is required in marginal conditions to get the AC75 up to foiling speed but once the AC75 is up and foiling the sail is an impediment as the apparent wind comes forward very quickly. Kenny Was saying 10 degrees upwind in the heavy stuff a few days ago.