Recent Blogs
Sloop Yawl Rig and Selected Balance Calculator
See a sloop-yawl rig with jib, gaff main and stern lug sail. Compare selected centers of effort, lateral resistance and waterline length.
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...
Jib Topsail Sloop: Idealized Sail-Force Component Calculator | FIRGELLI
Calculate lift, drag and a forward-axis component from entered wind, sail area and assumed coefficients. The diagram does not predict vessel speed, heel or rigging...
Hermaphrodite Brig: Sail-Area Coordinate Calculator | FIRGELLI
Compare an entered sail-area centroid with a lateral-resistance coordinate. This geometric comparison does not predict helm angle, sailing behavior or a suitable rig.
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...