The class rules define very precise limits for the design of the cockpit cross-section.
The maximum distance between the vertical tangent points of the deck is 914 mm.
The Minimum/Maximum distance of the cockpit narrowest points must be 578/622 mm.
The maximum depth of the narrowest point of the cockpit is 51 mm below the sheer points.
Combining the defined points delivers the optimal ergonomic cockpit cross section possible within the class rules.