Disadvantages of The Mast Aft Rig
Mast aft rigs are viewed as unconventional, and since recreational sailors often choose boats based on what "looks" right, mast aft rigs face resistance in the recreational market. Racing sailors will use whatever is fastest within class rules, and class rules are generally very closely tied to the conventional Bermuda rig.
Another disadvantage of the mast aft rig, when set up with no mainsail, is the drag on the mast. While the mast may interfere with the airflow around the mainsail, the mainsail also serves to reduce the drag on the mast. By not having a sail attached to the trailing edge of the mast, the mast becomes a significant source of drag.
The performance of the sail is dependent on having a forestay which is taut. If the forestay is allowed to slack, the sail will lose its airfoil shape and not perform as well.
This requires heavy rigging with high tension which adds stress to the overall sail rig system. Not really a disadvantage, but a parameter to consider if rigging a sailboat to use a mast aft rig.
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