Architectural Blueprints & Structural Plans
Explore the original C. William Lapworth design documents, hull sections, sail plans, and structural details for the Cal 40. Select any document below to view or download the high-resolution PDF schematic.
Mast Detail Schematic
Detailed view of mast step attachment, shroud stay tangs, and spar specifications.
Mast Beam Detail
Cross-section and dimensions for the internal tie-rod and main structural beam support.
Hull Sections & Deck Plan
Transverse body sections, deck hardware layout, and cockpit arrangement plans.
Hull Plan & Interior Plan
Internal cabin arrangement, pilot berths, nav station, and galley elevation drawings.
Sail Plan Blueprint
Original masthead rig elevation, sail area ratios, and dimensions (I, J, P, E).
Original Line Drawings
Bill Lapworth’s lines drawing showing waterlines, buttock lines, fin keel, and spade rudder.