To get the best speed when tacking and using a mainsail and jib, the sails should be trimmed such that __________.

Correct Answer: Option D — an air slot is formed between the two sails

Proper slot-effect aerodynamics depend on the spatial relationship between the jib and mainsail. Trimming them to form a smooth converging air slot accelerates airflow between the leeward side of the jib and the windward side of the mainsail, maximizing overall propulsive lift and efficiency.