Pointing-so whats that all about?

That sounds pretty short and wide with an aspect ratio of 2.7:1. A high aspect board could have an aspect ratio of 5:1 or greater. High aspect ratio foils stall at a higher speed but generate more lift for less drag when moving fast enough. What that means is that a LA board will work better in a slow boat at sub planing speeds than a HA board. Once the flow over the foil is sufficient a HA foil will be more efficient (think gliders with long narrow, super high aspect wings)

Originally posted by 423zero Regarding Centreboard size, is it length or breadth ? Or is it in relation to size of sail ?

All and none.
The centreboard has to provide enough lift to balance the forces coming from the sail. Bigger sail, more force. A long thin centreboard can do that, so can a short fat one. The long thin one will do it with less drag, but will be less tolerant of being given too much work to do, at which point it will stall out. The short fat one has more drag, but will continue to create lift (with ever more horrendous drag) at angles where a long thin one will simply give up.so a compromise must be made, and the best compromise will be different for different boats.

Originally posted by A2Z It's worth splitting leeway from pointing.  Pointing angle is heading relative to true wind and leeway is the angle between heading and course.   Bigger boards reduce leeway, but don't improve pointing angle.

I'm not convinced that's really a desirable split.

What we call leeway is simply the angle of attack the board must operate at in order to create enough lift to balance the sails. If a board is very undersize or badly shaped it may have to operate at a significant angle of attack to create enough lift, and that's going to be especially true of any foil that doesn't maintain good flow on the windward side, but its more about lift than anything else.

Once you have a board that's operating with decent attached flow both sides then extra area won't make much observable difference in a straight line at normal speed. Board size is really much more a differentiator when coming out of a tack when the board has to operate at very low speed with a lot of side load.

That's where digging the chine in helps, but yes, they go better with a bigger board.

The sail won't make it point higher, but the greater power will mean you can pinch at times and maybe bleed the speed more slowly. Generally, keep the boat moving. Off the start line, ensure you have space to leeward. If you pinch when going slow, you will simply go sideways, and the low rig will be stuffed in dirty air. Make sure you can tack off and tack back into a clear lane, then build speed before you point higher.

Will the Laser like battened sail fitted to my Sprint allow it to point higher than the simple Topper style triangular sail ?