Carbon’s greater strength allows smaller sections compared with aluminium reducing windage as well as weight. The manufacturing process also allows strength to be added at high-stress areas of the spar.
In salt water conditions, the carbon is more corrosion-resistant than aluminium.
A further advantage comes from sailing in waves. There is significantly less momentum from a lighter rig and this reduces the tendency for the ends of the boat to "dig in" as it crosses waves.
With the right stiffness component, carbon rigs support the sail more efficiently. Sail shape is more easily controlled adding to further improvement in power. Carbon will also bend significantly more than an Alloy spar before breaking.
|Laser and Aero spars|
|Aero fat head rig|