Recent Blogs
Leg-of-mutton Sail Mechanism Explained: How It Works, Parts, Uses, and Aerodynamic Force Diagram
A historical leg-of-mutton sail profile with a first-order lift-only calculator using triangular area, wind speed, entered lift coefficient and declared mathematical axes.
Lateen-rigged Felucca Mechanism Explained: Sail Diagram, Parts, Rig Geometry & Uses
Explore the two-masted lateen-rigged felucca and an interactive yard-hoisting diagram with adjustable yard, mast, halyard and rake proportions.
Square or Lug Sail Mechanism: How It Works, Parts, Diagram and Sailing Uses Explained
How a square or lug sail works, with rigging geometry, drive force formulas, and a worked example for traditional boatbuilders and sail trainers.
Split Lug or Square Sail: Mechanism, Sling Point Diagram, and Rig Parts Explained
Split Lug and Square Sail rigs explained — geometry, sail forces, and trim numbers for small craft, training boats, and traditional workboat restorations.
Lateen Rig Mechanism Explained: How the Triangular Sail Works, Parts, Geometry & Uses
How a Lateen Rig works, the geometry behind its upwind ability, and where you still see it today — from Nile feluccas to modern sailing...
Full Schooner Rig: Sail-force Projection Calculator | FIRGELLI
Explore a schematic schooner sail plan and compare ideal forward force from apparent wind, area and assumed coefficients. Understand why this does not predict boat...