Unobtainium is the metal at the top of every Naval Architect’s wish list. It’s a perfect marine material; light, strong, stiff yet flexible—it’s as inert as gold, but costs only pennies per pound. Sadly, like the search for El Dorado, this metal quest remains more alchemy than chemistry. For now, aluminum, especially the alloy 6061-T6, […]
In designing an asymmetrical cruising spinnaker, most sailmakers begin with the boats fore-triangle rig dimensions (I and J), and combine those with information about the intended use of the sail (tight reaching, reaching, or running) and information regarding where the sail will be used.