Spinnaker

A large lightweight headsail designed primarily for reaching or downwind sailing.

A symmetric spinnaker has two interchangeable clews and is commonly controlled with sheets, guys and a pole; an asymmetric spinnaker has a defined tack and clew and may be set from a bowsprit or bow. Cut, cloth and intended wind angle vary widely.

The sail produces substantial drive but can collapse, refill violently or overpower steering. Hoisting, gybing and lowering require coordinated control of halyard, sheets, guys or tack line, with crew clear of loaded lines and a recovery plan for wraps or broaches.